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A co-proteomic view of metabolite-specific interactions in the Botrytis cinerea-Arabidopsis pathosystem
To successfully infect their myriad hosts, generalist plant pathogens must tolerate a vast arsenal of plant specialized defense metabolites. To understand how host-specific metabolites influence plant-generalist pathogen interactions, we conducted a co-proteomic analysis of both Arabidopsis thaliana and Botrytis cinerea proteomes from the same samples during early infection. The Arabidopsis proteomic responses to Botrytis center around induction and suppression of defense metabolite...
Night-time control of carbohydrate availability in grasses differs radically from that in Arabidopsis
Grass leaves reportedly accumulate sucrose during the day then export it to other organs at night. The control of export at night is not understood. In contrast, Arabidopsis leaves accumulate starch then convert it to sucrose for export at night.
ATML1-GIR1-TPL/TPR transcriptional repression module controls glucosinolates and giant cells in Arabidopsis thaliana sepals
Glucosinolates (GSLs) are sulfur- and nitrogen-containing secondary metabolites that serve as defense compounds in Arabidopsis and other members of the Brassicales. Although the enzymatic pathway that produces GSLs is well-studied, the upstream mechanisms that control their tissue-specific synthesis are poorly understood. We identified a novel repression module that transcriptionally regulates GSL levels in sepals, the modified leaves that protect reproductive tissues within the floral bud.
Nucleoporin1 maintains male germ unit organization and transport in Arabidopsis pollen tubes, likely through shaping nuclear morphology
The male germ unit (MGU) in Arabidopsis pollen is comprised of one vegetative nucleus (VN) and two sperm nuclei (SN). It is evolutionarily specialized to deliver immotile sperm nuclei to an ovule for fertilization. Despite some progress in research on MGU, its organization and transport remain only partially understood.
CONSERVATION AND DIVERGENCE WITHIN THE ARABIDOPSIS TPL/TPR COREPRESSOR FAMILY
The TOPLESS (TPL) and TOPLESS-RELATED (TPR1-TPR4) corepressors, collectively the Arabidopsis TPX family, are recruited by client proteins to regulate nearly every major plant regulatory program. Here, we dissect the conservation and divergence between paralogs using a combination of higher-order genetics, transcriptomics, and a synthetic repression assay. TPL, TPR1, and TPR4 were found to act as the primary repressors for many pathways, while TPR2 and TPR3 played a lesser or sometimes...
Elevated temperature drives the biosynthesis of novel acylated glucosinolates in Arabidopsis thaliana seeds
Glucosinolates (GSLs) are major defensive compounds massively accumulated in Brassicaceae seeds, including that of the model plant Arabidopsis thaliana. While most studies have focused on the role of GSL in responses to biotic stress, the potential regulation and function of GSLs in responses to abiotic stresses have been neglected, particularly in seeds. In this study, multi-omic analyses revealed a previously uncharacterized GSL modification pathway induced by elevated temperature (ET)...
Arabidopsis hydathodes contain a dense and heterogeneous epithem for apoplastic fluid release
Hydathodes are specialized leaf tissues that mediate guttation, the release of liquid water droplets from vascular plants. They consist of xylem endings, water pores, and the epithem. The epithem comprises small cells whose cell types and functional properties remain poorly understood.
Loss of PSAE redirects PGRL1 to photosystem I and enhances PGR5-dependent cyclic electron transfer in Arabidopsis
Electrons energised by light energy at photosystem I (PSI) primarily enter the linear photosynthetic electron transfer (LET) or cyclic electron transfer (CET) pathway. The balance between LET and CET activity is a crucial factor in the regulation of photosynthesis, since CET increases the stoichiometry of proton to electron transfer. The additional transmembrane proton gradient ({Delta}pH) triggers feedback control of light harvesting and electron transfer photoprotection via...
Catch me if you can: Arabidopsis thaliana lags in adaptation to contemporary climate change
Anthropogenic climate change fosters unprecedented temperature challenges, with each year breaking a temperature record. Through evolution by natural selection, species and their populations have adapted to their previously local environments. However, as the average global land temperature has increased by ~2 C or more, natural selection on many species may not act fast enough with climate change, creating an adaptation lag.
Evolutionary Rewiring of Root Cell-Type Nitrogen Responses
Nitrate induces widespread transcriptional reprogramming in plants, but how transcription factors coordinate these responses across cell types and evolve across species with divergent root patterning remains unclear. Using single-cell transcriptomics in Arabidopsis thaliana and Solanum lycopersicum (tomato) under varying nitrate conditions, we demonstrate that many transcriptional responses are cell type and developmental stage-specific. Arabidopsis NIN-LIKE PROTEIN 7 (NLP7) directly...