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Alleviation by abscisic acid of Al toxicity in rice bean is not associated with citrate efflux but depends on ABI5-mediated signal transduction pathways

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Journal of Integrative Plant Biology 2019年第2期61卷 140-154页

作者： Wei Fan Jia Meng Xu Pei Wu Zhi Xin Yang He Qiang Lou Wei Wei Chen Jian Fen Jin Shao Jian Zheng Jian Li Yang College of Resources and Environment Yunan Agricultural University State Key Laboratory of Plant Physiology and Biochemistry College of Life Sciences Zhejiang University Institute of Life Sciences College of Life and Environmental Sciences Hangzhou Normal University

Under conditions of aluminum(Al) toxicity,which severely inhibits root growth in acidic soils, plants rapidly alter their gene expression to optimize physiological fitness for survival. Abscisic acid(ABA) has been suggested as a mediator between Al stress and gene expression, but the underlying mechanisms remain largely unknown. Here,we investigated ABA-mediated Al-stress responses, using integrated physiological and molecular biology approaches.We demonstrate that Al stress caused ABA accumulation in the root apex of rice bean(Vigna umbellata [Thunb.] Ohwi &Ohashi), which positively regulated Al tolerance. However,this was not associated with known Al-tolerance mechanisms. Transcriptomic analysis revealed that nearly one-third of the responsive genes were shared between the Al-stress and ABA treatments. We further identified a transcription factor, ABI5, as being positively involved in Al tolerance. Arabidopsis abi5 mutants displayed increased sensitivity to Al, which was not related to the regulation of AtALMT1 and AtMATE expression. Functional categorization of ABI5-mediated genes revealed the importance of cell wall modification and osmoregulation in Al tolerance, a finding supported by osmotic stress treatment on Al tolerance. Our results suggest that ABA signal transduction pathways provide an additional layer of regulatory control over Al tolerance in plants.

关键词： Alleviation by abscisic acid of Al toxicity in rice bean is not associated with citrate efflux but depends on ABI5-mediated sign ABA Figure ABI

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Translating auxin responses into ovules, seeds and yield: Insight from Arabidopsis and the cereals

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Journal of Integrative Plant Biology 2019年第3期61卷 310-336页

作者： Neil J.Shirley Matthew K.Aubert Laura G.Wilkinson Dayton C.Bird Jorge Lora Xiujuan Yang Matthew R.Tucker School of Agriculture Food and Wine Waite Research Institute The University of Adelaide

Grain production in cereal crops depends on the stable formation of male and female gametes in the flower.In most angiosperms, the female gamete is produced from a germline located deep within the ovary, protected by several layers of maternal tissue, including the ovary wall,ovule integuments and nucellus. In the field, germline formation and floret fertility are major determinants of yield potential, contributing to traits such as seed number,weight and size. As such, stimuli affecting the timing and duration of reproductive phases, as well as the viability,size and number of cells within reproductive organs can significantly impact yield. One key stimulant is the phytohormone auxin, which influences growth and morphogenesis of female tissues during gynoecium development, gametophyte formation, and endosperm cellularization. In this review we consider the role of the auxin signaling pathway during ovule and seed development, first in the context of Arabidopsis and then in the cereals. We summarize the gene families involved and highlight distinct expression patterns that suggest a range of roles in reproductive cell specification and fate. This is discussed in terms of seed production and how targeted modification of different tissues might facilitate improvements.

关键词： Grain production crops depends stable formation

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维普期刊数据库

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Mechanoresponsive Gene Upregulation by Force depends on H3K9Demethylation

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医用生物力学 2019年第A1期34卷 164-164页

作者： Junwei Chen Jian Sun Erfan Mohagheghian Ning Wang Laboratory for Cellular Biomechanics and Regenerative Medicine Department of Biomedical EngineeringCollege of Life Science and TechnologyHuazhong University of Science and TechnologyWuhan 430074 China Department of Mechanical Science and Engineering College of EngineeringUniversity of Illinois at Urbana-ChampaignUrbanaIL61801USA

All living cells in a human body are made of the same DNA molecule but cells in different tissues express different genes and proteins.How the transcription process is controlled and regulated is largely unknown.Specifically,mechanical forces are increasingly recognized to play critical roles in cell and tissue functions.However,what controls force-induced gene transcription is elusive.Recently we have reported that a local surface force transfers from integrins to the cytoskeleton and the link of nucleoskeleton and the cytoskeleton(LINC)into the nucleus and deforms chromatin directly to induce rapid activation of transgene DHFR.Here we show that endogenous mechanoresponsive genes egr-1 and Cav1 are rapidly upregulated and their upregulation depends on stress angles relative to the cell long axis,suggesting direct impact of these genes by force.Demethylation of histone 3 at lysine 9(H3K9)trimethylation(H3K9me3)at nuclear interiors(euchromatin)is necessary for force-induced transcription upregulation.Our findings suggest that force-rapid upregulation of mechanoresponsive genes by force depends on H3K9me3 demethylation.

关键词： Gene Upregulation Force depends H3K9 Demethylation

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