Wheat leaf senescence and its regulatory gene network  

作　　者：Nigarin Sultana Shahidul Islam Angela Juhasz Wujun Ma 

机构地区：[1]State Agriculture Biotechnology Centre,Murdoch University,Perth,WA 6150,Australia

出　　处：《The Crop Journal》2021年第4期703-717,共15页作物学报（英文版）

基　　金：financially supported by Australia Grain Research&Development Corporation Project(UMU00048);Murdoch University International Postgraduate Research Scholarship。

摘　　要：Wheat leaf senescence is a developmental process that involves expressional changes in thousands of genes that ultimately impact grain protein content(GPC), grain yield(GY), and nitrogen use efficiency.The onset and rate of senescence are strongly influenced by plant hormones and environmental factors e.g. nitrogen availability. At maturity, decrease in nitrogen uptake could enhance N remobilization from leaves and stem to grain, eventually leading to leaf senescence. Early senescence is related to high GPC and somewhat low yield whereas late senescence is often related to high yield and somewhat low GPC. Early or late senescence is principally regulated by up and down-regulation of senescence associated genes. Integration of external and internal factors together with genotypic variation influence senescence associated genes in a developmental age dependent manner. Although regulation of genes involved in senescence has been studied in rice, Arabidopsis, maize, and currently in wheat, there are genotypespecific variations yet to explore. A major effort is needed to understand the interaction of positive and negative senescence regulators in determining the onset of senescence. In wheat, increasing attention has been paid to understand the role of positive senescence regulator, e.g. GPC-1, regulated gene network during early senescence time course. Recently, gene regulatory network involved early to late senescence time course revealed important senescence regulators. However, the known negative senescence regulator Ta NAC-S gene has not been extensively studied in wheat and little is known about its value in breeding. Existing data on senescence-related transcriptome studies and gene regulatory network could effectively be used for functional study in developing nitrogen efficient wheat varieties.

关 键 词：Wheat(Triticum aestivum L.) SENESCENCE Nitrogen use efficiency NAC transcription factor STAY-GREEN 

分 类 号：S512.1[农业科学—作物学]