Journal of Experimental Botany
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Journal of Experimental Botany
@jxbotany.bsky.social
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Founded in 1950, the Journal of Experimental Botany (JXB) is a top-ranking journal owned by the Society for Experimental Biology (SEB) and dedicated to publishing advances in plant science.

https://academic.oup.com/jxb

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Journal of Experimental Botany @jxbotany.bsky.social · 6d
📢 NEW ISSUE ALERT 📢

🌷✨ JXB Issue 18 of 2025 is out now ✨🌷

On the cover: A beautiful watercolour painting of a Tulip Poplar sapling by @kateplantphys.bsky.social - see Johnson et al. this issue!

🔗👉 Read the full issue now: academic.oup.com/jxb...

#PlantScience 🧪 @sebiology.bsky.social
The cover of Vol 76 | Issue 18 | 2025 of the Journal of Experimental Botany. Light green banners border the top and bottom of the page and in the centre is an image of a watercolour painting. "Sapling of North American tree species and common city tree Liriodendron tulipifera (Tulip Poplar). This watercolour painting depicts the young potted trees of this species used in Johnson et al., pp. 5573–5587. Trees were placed in freezers while their leaves were imaged to track ice formation and spread. This research revealed that the pattern of ice spread in these leaves is governed by vein anatomy and provided the first visualisation of freeze-induced xylem embolism (air bubble formation) in leaf veins. (Image credit: Kate Johnson.)"
jxbotany.bsky.social
❄️🌱 RESEARCH 🌱❄️

Ice spreads in a predictable pattern through young L. tulipifera, governed by anatomy and vein architecture. Leaf lethality always involves damage to photosynthetic tissues and can involve air embolism - Johnson et al.

🔗 doi.org/10.1093/jxb/...

#PlantScience 🧪
Fig. 8.Comparative progression of drought- and freeze–thaw-induced embolism in leaves of young L. tulipifera. (A–C) The spread of embolism during three periods from 5 h to ∼25 h after the beginning of drought. (D–F) The spread of embolism during three periods from 5 min to 15 min after thawing began. Embolisms are colour-coded according to when they occurred, as indicated by the scale at the bottom of the figure.
November 19, 2025 at 4:15 PM
jxbotany.bsky.social
🫛🌼 RESEARCH 🌼🫛

Multi-environment field studies reveal independent genetic controls for mungbean flowering time and duration, with duration showing higher degree of genotype × environment interactions than flowering time 🧬

✍️ Dudley et al.

🔗 doi.org/10.1093/jxb/...

#PlantScience 🧪
Fig. 1.Phenotypic variation in flowering time and duration for the parents and families of the mungbean nested association mapping population. The population was developed from the 30 diverse donor parents crossed to the reference parent Crystal. (A) Days to flowering and (B) flowering duration, both measured as thermal time. Each boxplot shows the distributional spread across genotypes using the best linear unbiased estimates (BLUEs) for genotypes, calculated across the four environments. Boxplots display the interquartile range (box), median (horizontal line), and values within 1.5× the interquartile range (whiskers); points beyond are shown as outliers. Shading differentiates families of the NAM population and is consistent across panels.
November 19, 2025 at 2:02 PM
jxbotany.bsky.social
🛡️ RESEARCH 🛡️

Endoplasmic reticulum stress induced by necrotrophic fungal pathogens activates the unfolded protein response pathway in Arabidopsis via the IRE1-bZIP60 arm, and this is required for immunity to these pathogens- Blanchard et al. 🍄

🔗 doi.org/10.1093/jxb/...

#PlantScience 🧪
Fig. 10 (shortened, full legend in paper): Schematic representation of the role of the unfolded protein response (UPR), endoplasmic reticulum (ER) quality control (ER-QC), and ER-associated degradation (ERAD) during Botrytis cinerea infection of Arabidopsis thaliana plants. Infection with B. cinerea induces ER stress, which activates the canonical IRE1-bZIP60 branch of the UPR and the expression of the genes encoding the ER-QC machinery (BiP, ERDJ3, SDF2). We hypothesized that the activation of these signalling pathways might control the secretion of defence proteins that are necessary to establish defence against B. cinerea. Our data also indicate that active bZIP60 suppresses the expression of NAC053, a negative regulator of defence against B. cinerea. However, NAC053 expression depends on IRE1.
November 19, 2025 at 12:38 PM
jxbotany.bsky.social
🫛 RESEARCH 🫛

Iron retention, coupled with symbiotic associations driven by the enrichment of Variovorax and Paecilomyces in the roots, confers tolerance to combined iron deficiency and drought in soybean - Hasan et al.

🔗 doi.org/10.1093/jxb/...

#PlantScience 🧪
Fig. 10 (shortened, full legend in paper): A model of stress resilience in Clark exposed to Fe deficiency and drought. The model illustrates the mechanisms underlying stress resilience, including enhanced Fe and N retention mediated by root-localized symbiotic interactions with Bradyrhizobium, Paecilomyces, and Variovorax. Key transporters such as Ammonium transporter 1;2, EamA-like transporter, Sugar transporter 1, and SWEET10 facilitate nutrient exchange and carbon flow. Fe homeostasis is maintained through the activity of ferric chelate reductase (FCR), Fe-regulated protein 3, and siderophore-mediated Fe acquisition. Reactive oxygen species (ROS) are scavenged by Peroxidase 19, Glutaredoxin 4, and Glutathione peroxidase 6, while ferritin provides additional protection by inhibiting Fenton reactions.
November 19, 2025 at 11:43 AM
jxbotany.bsky.social
🔥 RESEARCH 🔥

Shrub resprouting depends on pre-disturbance condition, with aridity, soil fertility & fire history as secondary drivers. Repeated disturbance reduces resprouting, & adult plants are more resilient under low water conditions - Zomer et al.

🔗 doi.org/10.1093/jxb/...
#PlantScience 🧪
Fig. 1.Location of the study area (boxed region in inset map) in the Iberian Peninsula, showing the gradient of historical aridity (lower aridity index values are indicative of less aridity); location of field populations (left map) of Anthyllis cytisoides (n=6, brown circles) and Globularia alypum (n=10, teal triangles); and location of common garden seed provenances (right map) of A. cytisoides (n=4) in Low aridity (blue circles) and High aridity (red circles) areas. Borders in the inset map are countries, and in main maps are provinces.
November 19, 2025 at 9:21 AM
Reposted by Journal of Experimental Botany
jxbotany.bsky.social
🌱 RESEARCH 🌱

Atypical thioredoxins ACHT3, ACHT4, and TRX L2.2 fine-tune the light- and dark-dependent redox state of chloroplast enzymes through 2-Cys peroxiredoxins - Jiménez-López et al.

🔗 doi.org/10.1093/jxb/...

#PlantScience 🧪
Fig. 9.A proposed model of the contribution of atypical TRXs to chloroplast redox regulation. In the light, the photosynthetic electron transport chain produces reduced Fdx (FdxRED), which reduces typical TRXs (m and f types being the most abundant) via FTR. It remains unknown whether atypical TRXs are reduced via FTR. The efficient reduction of 2-Cys PRXs by atypical TRXs avoids excess draining of reducing power from typical TRXs. NADPH generated by the action of FNR is used by NTRC to reduce 2-Cys PRXs, hence counterbalancing drainage of reducing power from the pool of TRXs, thereby maintaining reduced, and active, chloroplast biosynthetic enzymes. In the dark, atypical TRXs mediate the oxidation of chloroplast enzymes via 2-Cys PRXs, which reduce hydrogen peroxide to water. More work is needed to establish the contribution of typical TRXs to enzyme oxidation in the dark.
November 18, 2025 at 3:58 PM
jxbotany.bsky.social
🌱 RESEARCH 🌱

Atypical thioredoxins ACHT3, ACHT4, and TRX L2.2 fine-tune the light- and dark-dependent redox state of chloroplast enzymes through 2-Cys peroxiredoxins - Jiménez-López et al.

🔗 doi.org/10.1093/jxb/...

#PlantScience 🧪
Fig. 9.A proposed model of the contribution of atypical TRXs to chloroplast redox regulation. In the light, the photosynthetic electron transport chain produces reduced Fdx (FdxRED), which reduces typical TRXs (m and f types being the most abundant) via FTR. It remains unknown whether atypical TRXs are reduced via FTR. The efficient reduction of 2-Cys PRXs by atypical TRXs avoids excess draining of reducing power from typical TRXs. NADPH generated by the action of FNR is used by NTRC to reduce 2-Cys PRXs, hence counterbalancing drainage of reducing power from the pool of TRXs, thereby maintaining reduced, and active, chloroplast biosynthetic enzymes. In the dark, atypical TRXs mediate the oxidation of chloroplast enzymes via 2-Cys PRXs, which reduce hydrogen peroxide to water. More work is needed to establish the contribution of typical TRXs to enzyme oxidation in the dark.
November 18, 2025 at 3:58 PM
jxbotany.bsky.social
🌳 RESEARCH 🌳

Exposing alder & oak to differing blue-to-red light ratios reveals species-specific responses in conductance & photosynthetic mechanisms, showing that water-use efficiency reductions occur via different physiological pathways - Diao et al.

🔗 doi.org/10.1093/jxb/...
#PlantScience 🧪
Fig. 8.Biochemical, mesophyll, and stomatal limitations on the photosynthetic response to increasing blue-light fraction for grey alder and holm oak. The biochemical (dAbiochem), mesophyll (dAmeso), and stomatal (dAstom) limitations were calculated according to Equation 9. (A) Grey alder. (B) Holm oak. At each %B level, dAbiochem, dAmeso, and dAstom were further normalized by multiplying them by dAn/dAcalc, where dAn is the difference between the maximum and current An. (C) The integrated relative limitations by Vcmax (maximum carboxylation rate of Rubisco; σbiochem), gm13 (total mesophyll conductance; σmeso), and gsc (stomatal conductance to CO2; σstom) across the different %B levels. All data are means (±SD), n=5 biological replicates.
November 18, 2025 at 1:10 PM
Reposted by Journal of Experimental Botany
jxbotany.bsky.social
🧬🌾 RESEARCH 🌾🧬

A quantitative trait locus for seed set was found on wheat chromosome 1B. The study emphasizes considering traits beyond anther extrusion and pollen shed for cost-effective hybrid seed production - Zapata et al.

🔗 doi.org/10.1093/jxb/...
#PlantScience 🧪 @leibnizipk.bsky.social
Fig. 1 (shortened, full legend in paper): Representation of the crossing block designs. (A) Lines representing females (♀; PIKO and HERMANN) were emasculated by applying chemical hybridizing agents (CHAs). The plots were surrounded by a distinct male-sterile crop to prevent cross-pollination between different males (♂; DH lines). (B) Schematic illustration of the pollen traps (indicated as 1 and 2) in one of the plots of female lines within the crossing block. Traits recorded in female lines were grain yield (GYf), thousand grain-weight (TGWf), seed set (SeedSet), plant height (PH*), heading date (HD*), flowering start*, and end of flowering*. The traits marked with asterisks were used to derive interaction traits: plant height difference (PHD), heading date difference (HDD), effective visual anther extrusion (VAEXEff, effective pollen count (PCEff), and female–male nicking (Nf|m).
November 18, 2025 at 11:28 AM
jxbotany.bsky.social
🧬🌾 RESEARCH 🌾🧬

A quantitative trait locus for seed set was found on wheat chromosome 1B. The study emphasizes considering traits beyond anther extrusion and pollen shed for cost-effective hybrid seed production - Zapata et al.

🔗 doi.org/10.1093/jxb/...
#PlantScience 🧪 @leibnizipk.bsky.social
Fig. 1 (shortened, full legend in paper): Representation of the crossing block designs. (A) Lines representing females (♀; PIKO and HERMANN) were emasculated by applying chemical hybridizing agents (CHAs). The plots were surrounded by a distinct male-sterile crop to prevent cross-pollination between different males (♂; DH lines). (B) Schematic illustration of the pollen traps (indicated as 1 and 2) in one of the plots of female lines within the crossing block. Traits recorded in female lines were grain yield (GYf), thousand grain-weight (TGWf), seed set (SeedSet), plant height (PH*), heading date (HD*), flowering start*, and end of flowering*. The traits marked with asterisks were used to derive interaction traits: plant height difference (PHD), heading date difference (HDD), effective visual anther extrusion (VAEXEff, effective pollen count (PCEff), and female–male nicking (Nf|m).
November 18, 2025 at 11:28 AM
jxbotany.bsky.social
🌱 RESEARCH 🌱

AGO1 is essential for Cu-deficiency responses but is sensitive to oxidative stress. FeSOD1 interacts with and protects AGO1 from superoxide radical-induced degradation, preserving miRNA-mediated gene silencing pathways - Tomassi et al.

🔗 doi.org/10.1093/jxb/...
#PlantScience 🧪
Copper (Cu) deficiency compromises plant growth and limits crop productivity. Plants respond to Cu scarcity by activating the expression of several miRNAs, known as Cu-miRNAs, which degrade mRNAs from various cuproproteins to conserve Cu. Cu-miRNAs, like most plant miRNAs, associate with ARGONAUTE 1 (AGO1), the primary effector protein of miRNA-mediated gene silencing pathways, whose function is typically modulated by interacting proteins acting as cofactors. However, how AGO1 is regulated and functions under Cu deficiency remains unknown. Here, we searched for AGO1 interactors in Arabidopsis thaliana plants expressing a functional AGO1 protein tagged with the Twin-Strep-tag (TST) polypeptide, grown under Cu-sufficient or Cu-deficient conditions. TST–AGO1 complexes were affinity purified, and proteins were identified using tandem MS. Interestingly, the iron superoxide dismutase 1 (FeSOD1) encoded by FSD1 was enriched in TST–AGO1 complexes purified from plants grown under Cu deficiency.
November 18, 2025 at 9:47 AM
jxbotany.bsky.social
🧬 RESEARCH 🧬

Post-translational modification of Rubisco activase varies between species, highlighting the limitations of extrapolating findings from model organisms to inform crop improvement strategies - Bhatnagar et al. 🌾

🔗 doi.org/10.1093/jxb/...

#PlantScience 🧪
Fig. 1.Phylogenetic representation of the amino acid present at the phosphorylation site (peptide position 78) within extant Rca gene models. Ancestral states for families and, when available, deeper orders of Angiosperms, are denoted at their corresponding nodes as pie charts. The confirmation of bootstrap values is given in Supplementary Fig. S1.
November 17, 2025 at 3:57 PM
Reposted by Journal of Experimental Botany
yokoyama-ryo.bsky.social
Illuminating the Subcellular Maze: Fluorescence-Activated Organelle Sorting in Plant Sciences academic.oup.com/jxb/article/... @jxbotany.bsky.social
Illuminating the Subcellular Maze: Fluorescence-Activated Organelle Sorting in Plant Sciences
Abstract. The isolation of organelles is critical for gaining a deeper understanding of their functions in intracellular processes, not only at the cellula
academic.oup.com
November 17, 2025 at 2:37 PM
jxbotany.bsky.social
🍂 RESEARCH 🍂

The catabolism of branched-chain amino acids and tyrosine contributes minimally to the functioning of the tricarboxylic acid cycle during developmental and dark-induced leaf senescence in Brassica napus 🍂

✍️ Aubert, Clouet et al.

🔗 doi.org/10.1093/jxb/...

#PlantScience 🧪
Fig. 6 (shortened, full legend in paper): Carbon isotopologue distribution of TCA cycle intermediates after incorporation of U-13C-labelled BCAAs and Tyr into control and DIS plants in either light or dark conditions. (A) Carbon isotopologue distribution for Glu, succinate, malate, and fumarate. (B) Metabolic map of carbon transitions supporting the results. White circles, 12C atoms; blue circles, 13C atoms from U-13C-labelled BCAAs and Tyr added in the first turn of the TCA cycle; orange circles, 13C atoms from U-13C-labelled BCAA and Tyr added in the second turn of the TCA cycle. The metabolic map did not consider the reassimilation of 13CO2 decarboxylations by Rubisco or PEPc and their commitments to the TCA cycle since: (i) there were relatively weak differences of carbon isotopologue distributions between ‘Control light’ and Control Dark’ conditions;
November 17, 2025 at 1:37 PM
jxbotany.bsky.social
🌱 RESEARCH 🌱

The overexpression of the nitrate transporter NRT2.7 stimulates growth by increasing the export of nitrate from the vacuole, the main cell compartment for nitrate storage - Armengaud et al.

🔗 doi.org/10.1093/jxb/...

#PlantScience 🧪 @annekrapp.bsky.social
Fig. 1 (shortened, full legend in paper): Growth effect of NRT2.7 overexpression in clca-2 and wild-type backgrounds. (A) Pictures of the wild type (WS), clca-2, the complemented line [CLCa-Ox (clca-2)], and NRT2.7-overexpressing line in clca-2 [NRT2.7-Ox (clca-2)] on the left side, and WS and the two NRT2.7-overexpressing lines, NRT2.7-Ox1 (WS) and NRT2.7-Ox2 (WS), on the right side. Plants were grown on 2 mM nitrate for 12 d (scale bars=1 cm). Shoot FW (B) and total root length (C) were measured on the wild type (WS), clca-2, CLCa-Ox (clca-2), and NRT2.7-Ox (clca-2) (left side of the panel) or WS, NRT2.7-Ox1 (WS), and NRT2.7-Ox2 (WS) (right side of the panel). The number of samples was 4–5 for shoot FW (one sample=a pool of 3–4 plants) and n=15–17 for total root length on individual plants. One representative experiment out of three is shown. The numbers above the bars shows the percentage increase or decrease compared with WS.
November 17, 2025 at 12:19 PM
jxbotany.bsky.social
🌾🧬 Editor's Choice 🌾🧬

Barley lateral branching oxidoreductase mutants reveal functional divergence between strigolactones involved in tillering and those involved in root exudates - Inoue et al.

🔗 doi.org/10.1093/jxb/...

#PlantScience 🧪
Fig. 2.Analysis of hvlbo gene-edited mutants. (A) Mutant hvlbo-2 and hvlbo-3 plants grown in hydroponic cups. Arrowheads indicate tillers. (B) Mutant hvlbo-2 and hvlbo-3 plants showed increased tillering at 18 d old compared with the WT variety [Golden Promise (GP)], but not as much as hvd14.d [compared with WT Sebastian (Seb)]. (C) In pots with soil and normal nutrients, hvlbo-2 tiller number was not different at 33 d post-emergence, but became greater in older plants. Root tissue was collected from the plants in hydroponic cups at 28 d old, after 10 d of P starvation. Extracts from the root tissues were analysed for SLs by LC-MS/MS. (D) 6-Epi-heliolactone was detected in the WTs and mutants, at similar relative levels. (E) Barleylactone 2 was detected in the WTs and mutants, at similar levels. Other SLs were not detected. (F) Root biomass was not significantly different. Data are means ±SEM, n=4–8. Asterisks show significant differences by Student’s t-test, *P≤0.05, **P≤0.01.
November 17, 2025 at 9:50 AM
jxbotany.bsky.social
🌸 RESEARCH 🌸

Comparative RNA-seq and metabolite analysis of feminized male cannabis plants revealed alterations in the expression of class B and E floral homeotic homologues and preferential development of sessile trichomes - Garcia-de Heer et al.

🔗 doi.org/10.1093/jxb/...

#PlantScience 🧪
Fig. 1.Inflorescence structures and individual flowers of cannabis plants in the three experimental groups: female flowers (FF), induced female flowers (IFF), and male flowers (MF). Inflorescences and individual flowers were collected on day 21 of flowering. IFF were treated with 1500 ppm ethephon, and FF and MF with distilled water, weekly throughout the flowering period. Note the axillary peduncle of both the IFF and MF and the stalked trichomes of the IFF, as well as the presence of both female and male flowers on the IFF plants. Images of individual flowers of FF and IFF are provided in Supplementary Fig. S1.
November 16, 2025 at 4:24 PM
jxbotany.bsky.social
🌳🧬 RESEARCH 🧬🌳

The WRKY transcription factor PagWRKY39a negatively regulates cambium cell activity and secondary cell wall thickening during wood formation in Populus - Li et al.

🔗 doi.org/10.1093/jxb/...

#PlantScience 🧪
Fig. 7.A schematic model illustrating the PagWRKY39a-mediated regulation of wood development in Populus. PagWRKY39a expression is significantly higher in the secondary phloem and cambium region and is reduced to its lowest level in expanding xylem. The PagWRKY39a protein can directly bind to the promoter of PagHB4 gene and represses PagHB4 expression, which leads to the repression of cambium cell division and xylem differentiation. Additionally, PagWRKY39a also has a high expression at the mature xylem region, where it may directly repress some uncharacterized genes to repress SCW thickening. The purple and blue curves depict the expression pattern of PagWRKY39a and PagHB4, respectively, in the wood formation zone. Arrows indicate positive regulation, and blunt lines indicate negative regulation.
November 16, 2025 at 2:22 PM
jxbotany.bsky.social
🌿🔥 INSIGHT 🔥🌿

✍️ "Legacies of stress and altered disturbance regimes threaten shrubland resilience" - Jacobsen & Pratt comment on recent research by Zomer et al.

Insight 🔗 doi.org/10.1093/jxb/...
Research 🔗 doi.org/10.1093/jxb/...

#PlantScience 🧪
Fig. 1.Resprouting plants differ in their success in resprouting post-fire as well as in the vigour of resprouting shoots. Some plants may (A) not survive the fire and will not resprout (plant 1), or will successfully resprout and subsequently die (plant 2), while yet others will resprout but with differing degrees of vigour, as evidenced by different crown heights and volumes (B–D). The images are the California Mediterranean-type climate region shrub, Adenostoma fasciculatum Hook. & Arn. (Rosaceae), during the first winter post-fire. (Photo credit: A.L. Jacobsen.)
November 16, 2025 at 12:00 PM
jxbotany.bsky.social
🌱 RESEARCH 🌱

This study reveals that sugars are essential for cytokinin to promote bud growth in plants, showing how sugars and hormones work together to control shoot branching - Jiang et al.

🔗 doi.org/10.1093/jxb/...

#PlantScience 🧪 @mklnicolas.bsky.social @frannybarbs.bsky.social
Fig. 1.Effect of cytokinin (BAP) on bud outgrowth in decapitated plants under different treatments. (A) Schematic representation of a decapitated rose plant. (B, C) Response of bud elongation to BAP or NAA application on a non-defoliated rose plant. (D, E) Response of bud elongation to BAP or NAA application on a defoliated rose plant. BAP, 6-benzylaminopurine; NAA, 1-naphthaleneacetic acid. BAP20, 20 µM BAP; BAP10, 10 µM BAP; BAP5, 5 µM BAP; BAP0, 0 µM BAP. NAA was used at 1 µM. Data are median values (n=30). Letters indicate significant differences between treatments (P<0.05).
November 16, 2025 at 10:16 AM
jxbotany.bsky.social
🌲 REVIEW 🌲

The aim of this review is to report on recent advances in the biochemistry and molecular biology of the amino acid arginine and its fundamental role in tree nitrogen economy - Ávila et al. ✍️

🔗 doi.org/10.1093/jxb/...

#PlantScience 🧪
Fig. 2.Arginine catabolism and its roles during stress responses, seasonal transitions, and seed germination in conifer and angiosperm trees. Pathways of arginine degradation in trees, highlighting its conversion into N compounds. In conifers, such as pine, arginine is a major N storage and transport molecule, especially during seed germination and seasonal remobilization in spring. In contrast, in angiosperms like Populus and other trees, N is more frequently transported as glutamine or asparagine, although arginine remain significant during stress.
November 15, 2025 at 3:33 PM
jxbotany.bsky.social
☀️ RESEARCH ☀️

Integrated photosynthesis during fluctuating irradiance is correlated with steady-state photosynthesis for rice grown in field environments with elevated CO2 and temperature ☀️🌡️🌾

✍️ Cai et al.

🔗 doi.org/10.1093/jxb/...

#PlantScience 🧪
Fig. 2 (shortened, full legend in paper): Effects of measurement CO2, growth CO2, measurement temperature, and growth temperature on CCFD-60s, CCFI-600s, Ani, and Anf in the 2023 experiment. Effects of measurement CO2 (the first column), growth CO2 (the second column), measurement temperature (the third column), and growth temperature (the fourth column) on CCFD-60s (A–D), CCFI-600s (E–H), Ani (I–L), and Anf (M–P) during a single-step change in irradiance in the 2023 experiment. CCFD-60s is the cumulative CO2 fixation (CCF) in the first 60 s after the decrease in irradiance; CCFI-600s is the CCF in the first 600 s after the increase in irradiance; Ani is the initial steady-state net photosynthetic rate (An) at Iinc (incident irradiance) of 50 μmol m–2 s–1; and Anf is the final steady-state An at Iinc of 1500 μmol m–2 s–1. Each data point is the mean value ±SE of three replications. Statistical parameters given in the panels are in bold if the lines were fitted for all data.
November 15, 2025 at 1:57 PM
jxbotany.bsky.social
🌸🌱 RESEARCH 🌱🌸

The Arabidopsis K-homology genes FLK and HOS5 interact to coordinate rapid co-transcriptional regulation of flowering and stress pathways to adapt plant responses to endogenous and environmental changes - Rodríguez-Cazorla et al.

🔗 doi.org/10.1093/jxb/...

#PlantScience 🧪
Fig. 8.A working model in which FLK, a key flowering time regulator, and HOS5, involved in stress responses, encode two Arabidopsis RNA-binding proteins (RBPs) with K-homology (KH) domains that interact to coordinate gene expression. Their multifaceted roles may enable rapid co-transcriptional regulation, necessary to integrate flowering and stress response pathways to adapt plant responses to endogenous and environmental changes, thus enhancing survival and reproduction.
November 15, 2025 at 10:27 AM
jxbotany.bsky.social
🧬 INSIGHT 🧬

✍️ "Oxidative stress: a new player in the regulation of AGO1 homeostasis?" - Jullien & Molinier comment on recent research by Tomassi et al.

Insight 🔗 doi.org/10.1093/jxb/...
Research 🔗 doi.org/10.1093/jxb/...

#PlantScience 🧪
Fig. 1 (shortened, full legend in paper): Regulation of AGO1 homeostasis. The fine-tuning of AGO1 contents relies on post-translational- and ubiquitin-mediated mechanisms. Thus, both AGO1 mRNA and protein levels are modulated by several different pathways. AGO1 transcripts are under the control of a self-regulation pathway involving two miR168 isoforms. These miR168 isoforms are loaded into either AGO1 or AGO10, triggering the degradation of AGO1 transcripts and the inhibition of AGO1 translation, respectively. AGO1 protein could act both in the cytoplasm and in the nucleus. Upon shuttling from the nucleus to the cytoplasm, AGO1 protein is under the control of post-translational modifications. Several studies characterized that AGO1 is directed either for degradation to the ubiquitin–proteasome system (UPS) or to autophagy involving protein ubiquitination (Ub).
November 15, 2025 at 9:21 AM
jxbotany.bsky.social
🍌 REVIEW 🍌

This review consolidates the highly fragmented knowledge on carbon allocation in banana, critically assessing existing hypotheses on source–sink dynamics and suggesting an agenda for research - Vantyghem & Damour ✍️

🔗 doi.org/10.1093/jxb/...

#PlantScience 🧪
Fig. 1.Banana plant morphology showing the parent plant, suckers, leaves, pseudostem, bunch, and rhizome, adapted from Dens et al. (2008).
November 14, 2025 at 3:36 PM