Differentiate responses of tetraploid and hexaploid wheat (<i>Triticum aestivum</i> L.) to moderate and severe drought stress: a cue of wheat domestication
Yan-Wen Gui, Mohamed S. Sheteiwy, Shuang‐Guo Zhu, Li Zhu, Asfa Batool, Tingting Jia, You‐Cai Xiong
Abstract
, the ɑ value was significantly greater in the hexaploid species, showing that hexaploid wheat distributed more biomass to ear than tetraploid to improve yield. Under 50% FC, this trend was enhanced. However, under 30% FC, there was no significant difference in the ɑ value between two species. Additionally, correlation analyses on yield formation affirmed the above results. Therefore, drought tolerance tended to be enhanced in hexaploid species under the pressure of artificial selection than that of tetraploid species. When drought stress exceeded a certain threshold, both species would be negatively seriously affected and followed a similar mechanism for better survival.