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Acta Agron Sin ›› 2009, Vol. 35 ›› Issue (2): 356-362.doi: 10.3724/SP.J.1006.2009.00356


Endogenous Phytohormone changes in the Release of Dormant Tillering Bud in rice

LIU Yang,WANG Qiang-Sheng,DING Yan-Feng,LIU Zheng-Hui,LI Gang-Hua,WANG Shao-Hua*   

  1. Agronomy College,Nanjing Agricultural University/Key Laboratory of Crop Growth Regulation,Ministry of Agriculture,Nanjing 210095,China
  • Received:2008-03-13 Revised:2008-06-12 Online:2009-02-12 Published:2008-11-18
  • Contact: WANG Shao-Hua


Tiller number is a major factor affecting rice grain yield. The endogenous hormone has substantial regulative effect on tillering of rice. However, little is known on the hormonal changes in releasing tillering bud. In this study, two indica rice cultivars were used with two treatments, removing panicle and retaining panicle, to investigate the pattern of hormonal changes during the period of dormant tillering bud sprouting. The result showed that the dormant tillering bud released and grew quickly after panicle removing. 1 d after removing panicle, the level of IAA in node and level of ABA in tillering bud decreased significantly, then the contents of these two hormones maintained at a constant level. The contents of Z+ZR in both node and bud increased significantly in panicle removing treatment. However, the content of IAA in the bud and the content of ABA in the node showed no significant difference between the two treatments. Further, the results showed that the ratio of hormones rather than a single hormone has the larger impact on tillering bud growth, with lower values of ABA/(Z+ZR) in bud and IAA/(Z+ZR) ratio in node showing beneficial effect whereas higher values of the two ratios demonstrating deleterious effect on tillering bud growth.

Key words: Rice, Tillering bud, Sprout, dormancy, Phytohormone

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