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Acta Agron Sin ›› 2013, Vol. 39 ›› Issue (10): 1835-1842.doi: 10.3724/SP.J.1006.2013.01835

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Mechanisms of Tiller Occurrence Affected by Exogenous IAA, GA3, and ABA in Wheat with Different Spike-types

CAI Tie,XU Hai-Cheng,YIN Yan-Ping,YANG Wei-Bing,PENG Dian-Liang,NI Ying-Li,XU Cai-Long,YANG Dong-Qing,WANG Zhen-Lin*   

  1. State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai’an 271018, China.
  • Received:2013-01-21 Revised:2013-06-01 Online:2013-10-12 Published:2013-07-31
  • Contact: 王振林, E-mail: zlwang@sdau.edu.cn, zlwangsd@sina.com, Tel: 0538-8241359

Abstract:

Two winter wheat cultivars, Shannong 15 and Shannong 8355, were used to study the effects of exogenous indole-3-acetic acid (IAA), gibberellic acid 3 (GA3), and abscisic acid (ABA) on tiller occurrence in wheat and the underlying mechanism. Exogenous IAA and GA3 inhibited occurrence of wheat tiller, while exogenous ABA reduced the rate of tiller occurrence. Furthermore, exogenous IAA and GA3 completely inhibited growth of tiller bud, while exogenous ABA significantly slowed the growth rate of tiller bud. The growth of tiller bud was positively correlated with content ofzeatin (ZT), but negatively correlated with IAA content and ratios of IAA/ZT and ABA/ZT. In contrast, the growth of tiller bud had slightly negative correlations with GA3 and ABA contents. These results suggest that IAA and ZT play a key role in regulating tiller occurrence in wheat, and exogenous hormones regulate the growth of tiller bud through changing contents of IAA and ZT and the ratios of IAA/ZT and ABA/ZT in tiller node.

Key words: Wheat, Tiller bud, Plant hormones, Regulation

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