Cytological and molecular characteristics of delayed spike development in wheat under low temperature in early spring
Cytological and molecular characteristics of delayed spike development in wheat under low temperature in early spring
复制标题
早春低温下小麦穗发育延迟的细胞学和分子特征
DOI：
10.1016/j.cj.2021.08.008
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发表时间：
2021-10
期刊：
影响因子：
--
通讯作者：
Fei Xiong
中科院分区：
文献类型：
--
作者：
Xurun Yu;Yufei Jiang;Huihui Yao;Liping Ran;Yong Zang;Fei Xiong
早春低温影响小麦的生长和产量。然而，低温调控小麦穗发育的细胞学和分子机制尚不清楚。对小麦穗在低温条件下的微观结构进行了观察和转录组测序。低温减缓了小麦穗的发育，降低了收获期小麦穗的产量组成参数，延缓了侧穗的形成和组织发育，诱导了顶穗的早期分化。低温增加了脱落酸的含量，导致脱落酸信号通路中编码pp2c、SnRK2s和bZIP转录因子的基因上调。低温还诱导了小麦对低温胁迫的响应以及调控脱落酸生物合成和其他物质代谢的33个冷响应基因的上调。小麦穗通过改变参与穗形态发生的转录因子mads6、ERF4、ERF78、WOX6和nac48等基因的表达水平来适应寒冷条件。这些结果表明，早春低温通过增加脱落酸含量或影响形态发生相关基因的表达来延缓小麦穗发育。
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 PP2Cs, SnRK2s, and bZIP 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 genesMADS6,ERF4,ERF78,WOX6, andNAC48. 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.
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