作物学报2011，Vol.37Issue(9)：1616-1622,7.DOI:10.3724/SP.J.1006.2011.01616
小麦茎秆木质素代谢及其与抗倒性的关系
Relationship between Lignin Metabolism and Lodging Resistance in Wheat
摘要
Abstract
As a component of cell wall, lignin is believed to be relevant to mechanical intensity of culm. In this study, we investigated the dynamic changes of lignin content and activities of four enzymes involved in lignin metabolism in culm as well as the snapping resistance and lodging index of wheat (Tritcum aestivum L.) to disclose the relationship between lignin content and lodging resistance. The lignin content and activities of phenylalanine ammonia-lyase (PAL), tyrosine ammonia-lyase (TAL), cin-namyl alcohol dehydrogenase (CAD), and 4-coumarate: CoA ligase (4CL) were tested with the second internode of six cultivars with different lodging resistance. The snapping resistance and culm lodging index were determined at anthesis, milking, and maturity stages. The lignin content varied significantly among cultivars. Jimai 22 and Jimai 20, which showed high resistance to culm snapping and loging, had higher lignin content and the activities of PAL, TAL, CAD, and 4CL than other cultivars. The lignin content was negatively correlated with the actual lodging ratio (r = -0.83, P ＜ 0.05), and positively correlated with the snapping resistance of culm (r = 0.86, P ＜ 0.05). The activities of PAL, TAL, and CAD were positively correlated with lignin content with correlation coefficients of 0.78 (P ＜ 0.05), 0.77 (P ＜ 0.05), and 0.85 (P ＜ 0.05), respectively. Based on these results, we conclude that high activities of PAL and CAD are the enzymatic basis of increased lignin content, and the lignin content in culm can be used as an important indicator to evaluate lodging resistance of wheat.关键词
冬小麦/木质素代谢/抗倒性/倒伏指数/酶活性Key words
Winter wheat/ Lignin metabolism/ Lodging resistance/ Lodging index/ Enzyme activity引用本文复制引用
陈晓光,史春余,尹燕枰,王振林,石玉华,彭佃亮,倪英丽,蔡铁..小麦茎秆木质素代谢及其与抗倒性的关系[J].作物学报,2011,37(9):1616-1622,7.基金项目
本研究由国家重点基础研究发展计划(973计划)项目(2009CB1 18602)和国家公益性行业(农业)科研专项(200803037)资助. （973计划）
