Cytological and molecular characteristics of delayed spike development in wheat under low temperature in early spring  

作　　者：Xurun Yu Yufei Jiang Huihui Yao Liping Ran Yong Zang Fei Xiong 

机构地区：[1]Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology,Agricultural College of Yangzhou University,Co-Innovation Center for Modern Production Technology of Grain Crops,Yangzhou University,Yangzhou 225009,Jiangsu,China [2]Yangzhou University Guangling College,Yangzhou 225000,Jiangsu,China

出　　处：《The Crop Journal》2022年第3期840-852,共13页作物学报（英文版）

基　　金：the Natural Science Foundation of China(31801269,31971810);the Natural Science Foundation of Jiangsu Province(BK20180275);the China Postdoctoral Science Foundation(2018M642332);A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)。

摘　　要：Low temperature in early spring impairs wheat growth and grain yield.However,little is known about the cytological and molecular mechanisms underlying low temperature regulation of wheat spike development.Microstructure observation and transcriptome sequencing of wheat spikes under low temperature were conducted.Low temperature slowed spike development,reduced the yield-component parameters of wheat spikes at the harvest stage,delayed the formation of lateral spikelets and tissue development,and induced the early differentiation of terminal spikelets.Low temperature increased the content of abscisic acid and caused the upregulation of genes in the abscisic acid signaling pathway,including those encoding PP2 Cs,Sn RK2 s,and b ZIP transcription factors.Low temperature also induced the upregulation of 33 cold-responsive genes involved in wheat response to low-temperature stress and regulation of abscisic acid biosynthesis and metabolism of other substances.The wheat spike adapted to cold conditions by changing the expression levels of genes involved in spike morphogenesis,including the transcription-factor genes MADS6,ERF4,ERF78,WOX6,and NAC48.These findings suggest that low temperature in early spring delays wheat spike development by increasing abscisic acid content or affecting the expression of genes involved in morphogenesis.

关 键 词：DEVELOPMENT Low temperature SPIKE TRANSCRIPTOME WHEAT 

分 类 号：S512.1[农业科学—作物学]