Evolution of physiological responses to salt stress in hexaploid wheat

Chunwu Yang; Long Zhao; Huakun ZhangZongze YangHuan WangShanshan WenChunyu ZhangSachin RustgiDiter von WettsteinBao Liu

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Evolution of physiological responses to salt stress in hexaploid wheat

机译：Evolution of physiological responses to salt stress in hexaploid wheat

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摘要

Hexaploid bread wheat (Triticum aestivum L., genome BBAADD) is generally more salt tolerant than its tetraploid wheat progenitor (Triticum turgidum L.). However, little is known about the physiological basis of this trait or about the relative contributions of allohexaploidization and subsequent evolutionary genetic changes on the trait development. Here, we compared the salt tolerance of a synthetic allohexaploid wheat (neo-6x) with its tetraploid (T. turgidum; BBAA) and diploid (Aegilops tauschii; DD) parents, as well as a natural hexaploid bread wheat (nat-6x). We studied 92 morphophysiological traits and analyzed homeologous gene expression of a major salt-tolerance gene High-Affinity K~+ Transporter 1;5 (HKT1;5). We observed that under salt stress, neo-6x exhibited higher fitness than both of its parental genotypes due to inheritance of favorable traits like higher germination rate from the 4x parent and the stronger root Na~+ retention capacity from the 2x parent. Moreover, expression of the D-subgenome HKT1;5 homeolog, which is responsible for Na~+ removal from the xylem vessels, showed an immediate transcriptional reprogramming following allohexaploidization, i.e., from constitutive high basal expression in Ae. tauschii (2x) to salt-induced expression in neo-6x. This phenomenon was also witnessed in the nat-6x. An integrated analysis of 92 traits showed that, under salt-stress conditions, neo-6x resembled more closely the 2x than the 4x parent, suggesting that the salt stress induces enhanced expressivity of the D-subgenome homeologs in the synthetic hexaploid wheat. Collectively, the results suggest that condition-dependent functionalization of the subgenomes might have contributed to the wide-ranging adaptability of natural hexaploid wheat.

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《Proceedings of the National Academy of Sciences of the United States of America》 |2014年第32期|11882-11887|共6页
作者
Chunwu Yang; Long Zhao; Huakun ZhangZongze YangHuan WangShanshan WenChunyu ZhangSachin RustgiDiter von WettsteinBao Liu;
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作者单位

Key Laboratory of Molecular Epigenetics of Ministry of Education, Northeast Normal University, Changchun 130024, China;

Department of Agronomy, Jilin Agricultural University, Changchun 130118, China;

Department of Crop and Soil Sciences, Washington State University, Pullman, WA 99164;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
transcriptional rewiring; Na~+ homeostasis; salinity tolerance;

Evolution of physiological responses to salt stress in hexaploid wheat

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