Homoeologous exchange enables rapid evolution of tolerance to salinity and hyper-osmotic stresses in a synthetic allotetraploid wheat
Homoeologous exchange enables rapid evolution of tolerance to salinity and hyper-osmotic stresses in a synthetic allotetraploid wheat
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DOI：
10.1093/jxb/erac355
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Lei Gong
中科院分区：
文献类型：
--
作者：
Bin Wang;Ruili Lv;Zhibin Zhang;Chunwu Yang;Hongwei Xun;Bao Liu;Lei Gong
Abstract The link between polyploidy and enhanced adaptation to environmental stresses could be a result of polyploidy itself harboring higher tolerance to adverse conditions or polyploidy possessing higher evolvability than diploids under stress conditions. Natural polyploids are inherently unsuitable to disentangle these two possibilities. Using selfed progenies of a synthetic allotetraploid wheat AT3 (AADD) along with its diploid parents, Triticum urartu TMU38 (AA) and Aegilops tauschii TQ27 (DD), we addressed the foregoing issue under abiotic salinity and hyper-osmotic (drought-like) stress. Under short duration of both stresses, euploid plants of AT3 showed intermediate tolerant levels of diploid parents; under life-long duration of both stresses, tolerant individuals to either stress emerged from selfed progenies of AT3 but not from comparable-sized diploid parent populations. Tolerance to both stresses were conditioned by the same two homoeologous exchanges (HEs; 2DS/2AS and 3DL/3AL), and at least one HE needs to be at homozygous state. Transcriptomic analyses revealed hyper-upregulation of within-HE stress responsive genes of the A-subgenome origin is likely responsible for the dual-stress tolerant phenotypes. Our results suggest HE-mediated inter-subgenome rearrangements might be an important mechanism leading to adaptive evolution in allopolyploids as well as a promising target for genetic manipulation in crop improvement.
