Effect of Plant Growth Regulators on the Growth of Wheat Tiller Buds is Related to Changes in Endogenous Hormones
Hormones play important roles in regulating the growth of wheat tiller buds.However,little is known about the relationships and the underlying mechanisms between endogenous hormones and the growth of wheat tiller buds induced by exogenous hormones.In the study,two winter wheat cultivars (Shannong 15 and Shannong 8355) were used to investigate the effect of exogenous indole-3-acetic acid (IAA),gibberellic acid 3 (GA3),abscisic acid(ABA),and zeatin(ZT) on the tiller buds outgrowth,and the relationship between endogenous hormones and the growth of tiller buds.The results showed that exogenous IAA and GA3 completely inhibited the tiller buds growth,and ABA significantly slowed the growth rate of tiller buds,while the tiller buds growth was not affected by exogenous ZT compared with the control.Exogenous IAA increased the IAA contents and the ratio of IAA to ZT,but inhibited the increase in the ZT contents.At the same time,the application of GA3 increased contents of IAA,GAs,and ABA,the ratios of IAA to ZT and ABA to ZT,but decrease ZT contents.In addition,ABA treatment increased the ABA contents and the ratios of ABA to ZT,but slowed the increase in the ZT contents.According to correlation analysis,the tiller buds growth was significantly and positively correlated with the content of ZT,whereas significantly and negatively correlated with the IAA contents and the ratios of IAA to ZT and ABA to ZT.Moreover,no significant correlation was observed between the tiller buds growth and the contents of GAs and ABA.These results suggested that IAA and ZT play key roles in regulating the growth of wheat tiller buds,and exogenous hormones regulated the contents of IAA and ZT,the ratio of IAA to ZT,and the ratio of ABA to ZT in tiller nodes,thus regulating the growth of wheat tiller buds.
Abscisic acid Gibberellic acid 3 Growth Indole-3-acetic acid Tiller buds Wheat (Triticum aestivum L.) Zeatin
CAI Tie XU Haichen YIN YanPing YANG Weibing PENG Dianliang NI Yingli XU Cailong YANG Dongqing Wang Zhenlin
National Key Laboratory of Crop Biology, Shandong Agricultural University, Tai”an 271018, Shandong, P. R. China
国内会议
北京
英文
304-314
2012-11-01（万方平台首次上网日期，不代表论文的发表时间）