The study reveals that red pigmentation in quinoa (Chenopodium quinoa) epidermal bladder cells is due to a ~4‑kb genomic insertion that restores the full-length CYP76AD gene, which is the rate‑limiting enzyme for betacyanin synthesis. Cell‑type‑specific RNA‑sequencing showed that this restored CYP76AD is highly upregulated in red bladder cells, and subgenome analysis indicated B‑subgenome dominance for this gene in pigmented tissues.
The authors used a bottom‑up thermodynamic modelling framework to investigate how plants decode calcium signals, starting from Ca2+ binding to EF‑hand proteins and extending to higher‑order decoding modules. They identified six universal Ca2+-decoding modules that can explain variations in calcium sensitivity among kinases and provide a theoretical basis for interpreting calcium signal amplitude and frequency in plant cells.
Using ten Phaeodactylum tricornutum mutant strains with graded constitutive Lhcx1 expression, the study links NPQ induction under high light to physiological outcomes (oxidized QA, increased cyclic electron flow) and extensive transcriptomic reprogramming, affecting nearly half the genome. The approach demonstrates that higher NPQ mitigates PSII damage, boosts ATP production for repair, and drives distinct gene regulatory networks, providing a model framework for dissecting photosynthetic and gene expression integration.
The study establishes a tractable system using the large bloom-forming diatom Coscinodiscus granii and its natural oomycete parasite Lagenisma coscinodisci, enabling manual isolation of single host cells and stable co-cultures. High‑quality transcriptomes for both partners were assembled, revealing diverse oomycete effectors and a host transcriptional response involving proteases and exosome pathways, while also profiling the co‑occurring heterotrophic flagellate Pteridomonas sp. This tripartite platform provides a unique marine model for dissecting molecular mechanisms of oomycete‑diatom interactions.
Wood composition, rather than microbial communities, underpins varietal differences in wood degradation and esca foliar symptom expression in grapevine
In a common‑garden study of 23 Vitis vinifera cultivars, the authors linked higher white‑rot necrosis and elevated hemicellulose coupled with reduced extractives to increased susceptibility to Esca disease. Glycosylated phenylpropanoids accumulated in symptomatic vines, while the composition of healthy‑wood endophytic microbial communities remained unchanged across cultivars, indicating that wood degradability and metabolic response drive susceptibility more than microbial factors.
Chromosome-scale haplotype genome assemblies for the Australian mango 'Kensington Pride' 1 and a wild relative, Mangifera laurina, provide insights into anthracnose-resistance and volatile 2 compound biosynthesis genes
Authors: Wijesundara, U. K., Furtado, A., Masouleh, A., Dillon, N. L., Smyth, H., Henry, R. J.
Chromosome-level, 100% complete genomes of the Australian mango cultivar Kensington Pride and the wild relative M. laurina were assembled using high-coverage PacBio HiFi sequencing. Comparative analyses uncovered extensive structural variation, identified key genes in carotenoid, anthocyanin, and terpenoid pathways, and pinpointed a SNP in the β-1,3-glucanase 2 gene associated with anthracnose resistance. Whole-genome duplication and collinearity analyses revealed two polyploidization events and conserved gene blocks across mango genomes.
The study evaluated a transgenic soybean line (VPZ-34A) expressing Arabidopsis VDE, PsbS, and ZEP for combined improvements in light‑use efficiency and carbon assimilation under ambient and elevated CO2 in a FACE experiment. While VPZ‑34A showed enhanced maximum quantum efficiency of PSII under fluctuating light, it did not increase carbon assimilation efficiency or yield, and transcriptome analysis revealed limited gene expression changes. The results suggest that VPZ‑mediated photosynthetic gains are insufficient to boost productivity under elevated CO2.
The study performed a meta‑transcriptomic analysis of over twenty drought versus control experiments in Vitis vinifera and two hybrid rootstocks, identifying a core set of 4,617 drought‑responsive genes. Using transcription factor binding motif enrichment and random‑forest machine learning, gene regulatory networks were built, revealing key regulators such as ABF2, MYB30A, and a novel HMG‑box protein. These regulators and network hierarchies provide candidate targets for breeding and biotechnological improvement of grapevine drought tolerance.
Integrating physiological, transcriptomic, and cellular analyses, the study shows that olive fruit abscission zones undergo lignification, alkalization, and extensive cell‑wall remodeling during natural maturation and after ethephon treatment. A set of 733 FAZ‑specific genes, including β‑1,3‑glucanases, pectate lyases, and pH‑regulating transporters, were identified, and increased glucanase activity together with reduced plasmodesmata callose suggest enhanced intercellular communication facilitates organ detachment in this non‑climacteric fruit.
The study investigates the role of the chromatin regulator MpSWI3, a core subunit of the SWI/SNF complex, in the liverwort Marchantia polymorpha. A promoter mutation disrupts male gametangiophore development and spermiogenesis, causing enhanced vegetative propagation, and transcriptomic analysis reveals that MpSWI3 regulates genes controlling reproductive initiation, sperm function, and asexual reproduction, highlighting its ancient epigenetic role in balancing vegetative and reproductive phases.