Lodging resistance of winter wheat (Triticum aestivum L.): Lignin accumulation and its related enzymes activities due to the application of paclobutrazol or gibberellin acid

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• 作者：Dianliang Peng ; Xiaoguang Chen ; Yanping Yin ; Kunli Lu ; Weibing Yang ; Yuhai Tang ; Zhenlin Wang
• 关键词：Breaking strength ; Lignin ; Lodging ; Gibberellin acid ; Paclobutrazol ; Wheat (Triticum aestivum L.)
• 刊名：Field Crops Research
• 出版年：15 February, 2014
• 年：2014
• 卷：157
• 期：Complete
• 页码：1-7
• 全文大小：774 K

文摘

Lodging is an important constraint limiting wheat yields and quality by bending or breaking stems on wheat (Triticum aestivum L.) production worldwide. This study was conducted to determine whether lignin accumulation and lodging resistance of winter wheat could be affected by application of paclobutrazol (PP₃₃₃) or gibberellin acid (GA₃) at stem elongation stage (DC 3.0). Two winter wheat cultivars, Jimai22 (lodging-tolerant cultivar; JM22) and Shannong16 (lodging-susceptible cultivar; SN16), were used to investigate the effect of exogenous hormones on wheat lodging behavior, lignin accumulation in culms and its relation to lodging resistance. Results showed that application of PP₃₃₃ significantly reduced plant height and the length of basal second internode, while GA₃ had the opposite effect. Lignin accumulation was positively and significantly correlated with the breaking strength of internode and culm lodging resistance index (CLRI). PP₃₃₃ significantly increased lignin accumulation and its related enzymes activities in the basal second internode, and also increased the diameter, wall thickness, filling degree of the internode, thus the breaking strength and lodging resistance of wheat increased. Whereas, GA₃ caused opposite effect on those characteristics. These results suggested that the exogenous PP₃₃₃ or GA₃ application significantly changed the risk of lodging occurred not only by altering the plant height but also by altering the physical strength of the basal part of the culm internode, especially, altering the lignin accumulation and its related enzymes activities in basal internode.