Feng Kai, Wang Xiao, Zhou Qin, Dai Tingbo, Cao Weixing, Jiang Dong, Cai Jian
National Technique Innovation Center for Regional Wheat Production, Key Laboratory of Crop Physiology and Ecology in Southern China, Ministry of Agriculture, National Engineering and Technology Center for Information Agriculture, Nanjing Agricultural University, Nanjing 210095, China.
Plants (Basel). 2022 Jul 28;11(15):1969. doi: 10.3390/plants11151969.
With global climate change, waterlogging stress is becoming more frequent. Waterlogging stress inhibits root growth and physiological metabolism, which ultimately leads to yield loss in wheat. Waterlogging priming has been proven to effectively enhance waterlogging tolerance in wheat. However, it is not known whether waterlogging priming can improve the offspring's waterlogging resistance. Here, wheat seeds that applied waterlogging priming for one generation, two generations and three generations are separately used to test the hypoxia stress tolerance in wheat, and the physiological mechanisms are evaluated. Results found that progeny of primed plants showed higher plant biomass by enhancing the net photosynthetic rate and antioxidant enzyme activity. Consequently, more sugars are transported to roots, providing a metabolic substrate for anaerobic respiration and producing more ATP to maintain the root growth in the progeny of primed plants compared with non-primed plants. Furthermore, primed plants' offspring promote ethylene biosynthesis and further induce the formation of a higher rate of aerenchyma in roots. This study provides a theoretical basis for improving the waterlogging tolerance of wheat.
随着全球气候变化，渍水胁迫日益频繁。渍水胁迫会抑制根系生长和生理代谢，最终导致小麦减产。已证明渍水引发处理能有效提高小麦的耐渍性。然而，尚不清楚渍水引发处理是否能提高后代的抗渍性。在此，分别使用经过一代、两代和三代渍水引发处理的小麦种子来测试小麦的耐缺氧胁迫能力，并评估其生理机制。结果发现，引发处理植株的后代通过提高净光合速率和抗氧化酶活性，表现出更高的植株生物量。因此，与未引发处理的植株相比，更多的糖分被运输到根系，为无氧呼吸提供代谢底物，并产生更多的ATP以维持引发处理植株后代的根系生长。此外，引发处理植株的后代促进乙烯生物合成，并进一步诱导根系中形成更高比例的通气组织。本研究为提高小麦的耐渍性提供了理论依据。
