Late sowing enhances lodging resistance of wheat plants by improving the biosynthesis and accumulation of lignin and cellulose  

作　　者：DONG Xiu-chun QIAN Tai-feng CHU Jin-peng ZHANG Xiu LIU Yun-jing DAI Xing-long HE Ming-rong 

机构地区：[1]State Key Laboratory of Crop Biology,Ministry of Science and Technology/Key Laboratory of Crop Ecophysiology and Farming System,Ministry of Agriculture and Rural Affairs/Agronomy College,Shandong Agricultural University,Tai’an 271018,P.R.China [2]Jining Agricultural Technology Extension Center,Jining 272113,P.R.China

出　　处：《Journal of Integrative Agriculture》2023年第5期1351-1365,共15页农业科学学报（英文版）

基　　金：supported by the National Key Research and Development Program of China (2016YFD0300403);the National Natural Science Foundation of China(31801298);the Fund of Shandong‘Double Top’Program,China (SYL2017YSTD05)。

摘　　要：Delayed sowing mitigates lodging in wheat. However, the mechanism underlying the enhanced lodging resistance in wheat has yet to be fully elucidated. Field experiments were conducted to investigate the effects of sowing date on lignin and cellulose metabolism, stem morphological characteristics, lodging resistance, and grain yield. Seeds of Tainong 18,a winter wheat variety, were sown on October 8(normal sowing) and October 22(late sowing) during both of the 2015–2016 and 2016–2017 growing seasons. The results showed that late sowing enhanced the lodging resistance of wheat by improving the biosynthesis and accumulation of lignin and cellulose. Under late sowing, the expression levels of key genes(Ta PAL, Ta CCR, Ta COMT, TaCAD, and TaCesA1, 3, 4, 7, and 8) and enzyme activities(TaPAL and TaCAD) related to lignin and cellulose biosynthesis peaked 4–12 days earlier, and except for the TaPAL, TaCCR, and TaCesA1 genes and TaPAL, in most cases they were significantly higher than under normal sowing. As a result, lignin and cellulose accumulated quickly during the stem elongation stage. The mean and maximum accumulation rates of lignin and cellulose increased, the maximum accumulation contents of lignin and cellulose were higher, and the cellulose accumulation duration was prolonged. Consequently, the lignin/cellulose ratio and lignin content were increased from 0 day and the cellulose content was increased from 11 days after jointing onward. Our main finding is that the improved biosynthesis and accumulation of lignin and cellulose were responsible for increasing the stem-filling degree, breaking strength, and lodging resistance. The major functional genes enhancing lodging resistance in wheat that are induced by delayed sowing need to be determined.

关 键 词：CELLULOSE LATE SOWING LIGNIN LODGING resistance wheat 

分 类 号：S512.1[农业科学—作物学]