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The proteome landscape of the root cap reveals a role for the jacalin-associated lectin JAL10 in the salt-induced endoplasmic reticulum stress pathway

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Plant Communications 2023年第6期4卷 179-196页

作者： Krishna Kodappully Das Ankita Mohapatra Abin Panackal George Sreenivas Chavali Katja Witzel eswarayya ramireddy Department of Biology Indian Institute of Science Education and Research(IISER)TirupatiTirupati 517507Andhra PradeshIndia Leibniz Institute of Vegetable and Ornamental Crops Theodor-Echtermeyer-Weg 114979 GroßbeerenGermany

Rapid climate change has led to enhanced soil salinity,one of the major determinants of land degradation,resulting in low agricultural *** has a strong negative impact on food security and environmental *** display various physiological,developmental,and cellular responses to deal with salt *** studies have highlighted the root cap as the primary stress sensor and revealed its crucial role in *** root cap covers the primary root meristem and is the first cell type to sense and respond to soil salinity,relaying the signal to neighboring cell ***,it remains unclear how root-cap cells perceive salt stress and contribute to the salt-stress ***,we performed a root-cap cell-specific proteomics study to identify changes in the proteome caused by salt *** study revealed a very specific salt-stress response pattern in root-cap cells compared with non-rootcap cells and identified several novel proteins unique to the root ***-cap-specific protein–protein interaction(PPI)networks derived by superimposing proteomics data onto known global PPI networks revealed that the endoplasmic reticulum(ER)stress pathway is specifically activated in root-cap cells upon salt ***,we identified root-cap-specific jacalin-associated lectins(JALs)expressed in response to salt stress.A JAL10-GFP fusion protein was shown to be localized to the *** of jal10 mutants indicated a role for JAL10 in regulating the ER stress pathway in response to *** together,our findings highlight the participation of specific root-cap proteins in salt-stress response ***,root-cap-specific JAL proteins and their role in the salt-mediated ER stress pathway open a new avenue for exploring tolerance mechanisms and devising better strategies to increase plant salinity tolerance and enhance agricultural productivity.

关键词： Arabidopsis root cap cell-type specific proteomics salt stress ER stress jacalin-associated lectin

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Cytokinin as a positional cue regulating lateral root spacing in Arabidopsis

Cytokinin as a positional cue regulating lateral root spacin...

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2016年全国植物生物学大会

作者： Ling Chang eswarayya ramireddy Thomas Schmülling Institute of Biology/Applied Genetics Dahlem Centre of Plant Sciences (DCPS)Freie Universit?t Berlin Present address: Hubei Collaborative Innovation Center for Green Transformation of Bio -Resources College of Life ScienceHubei University

The root systems of plants have developed adaptive architectures to exploit soil resources. The formation of lateral roots(LRs) contributes to root system architecture. Roots of plants with a lower cytokinin status form LR primordia(LRP) in unusually close proximity,indicating a role for the hormone in regulating the positioning of LRs along the main root axis. Data obtained from cytokinin-synthesis mutants of Arabidopsis thaliana combined with gene expression analysis indicate that cytokinin synthesis by IPT5 and LOG4 occurring early during LRP initiation generates a local cytokinin signal abbreviating LRP formation in neighbouring pericycle cells. In addition,IPT3,IPT5,and IPT7 contribute to cytokinin synthesis in the vicinity of existing LRP,thus suppressing initiation of new LRs. Interestingly,mutation of CYP735 A genes required for trans-zeatin biosynthesis caused strong defects in LR positioning,indicating an important role for this cytokinin metabolite in regulating LR spacing. Further it is shown that cytokinin and a known regulator of LR spacing,the receptor-like kinase ARABIDOPSIS CRINKLY4(ACR4),operate in a non-hierarchical manner but might exert reciprocal control at the transcript level. Taken together,the results suggest that cytokinin acts as a paracrine hormonal signal in regulating root system architecture.

关键词： Arabidopsis thaliana cytokinin lateral root lateral root spacing root branching root system architecture

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