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Acta Agron Sin ›› 2009, Vol. 35 ›› Issue (5): 899-906.doi: 10.3724/SP.J.1006.2009.00899


Effects of Exogenous ABA and GA on the Main Quality Characteristics of  Grains at Different Positions of Panicle in Rice

DONG Ming-Hui1,LIU Xiao-Bin2,LU Chun-Quan1,ZHAO Bu-Hong2,YANG Jian-Chang1*   

  1. 1Fostering Base for the National Key Laboratory of Crop Genetics and Physiology of Jiangsu Province,Yangzhou University,Yangzhou 225009,China;2Lixiahe Region Agricultural Research Institute of Jiangsu,Yangzhou 225007,China
  • Received:2008-09-23 Revised:2008-12-31 Online:2009-05-12 Published:2009-03-23
  • Contact: YANG Jian-Chang,0514-87979317,Fax:0517-87979317 E-mail:jcyang@yzu.edu.cn


Plant hormones play important roles in plant growth and development and yield formation. ABA and GA are two important kinds of hormones controlling rice grain development and filling, but the mechanism of regulating grain quality by them is not understood completely. In order to study and document the influence of ABA and GA on grain quality, the solutions with low concentrations of exogenous ABA (75.7 μmol L-1) and GA(57.7 μmol L-1) were sprayed at earlier filling stage. The results indicated that the effects of exogenous hormones at early filling stage on rice quality were great, and varied with exogenous hormone varieties and different grain positions. The exogenous ABA increased the 1000-grain weight (KGW) and head milled rice rate (HMRR), and reduced chalkiness degree (CD); the effect of ABA on grain quality varied with the positions of branch and grain in a rice panicle, which was greater on the later-flowered spikelets than on the earlier-flowered spikelets in the same branch, and on second branch than on primary branch. With spraying exogenous GA, KGW, and HMRR, gel consistence and crude protein content (CPC) were decreased significantly, while CD and amylase content were increased. The effect of spraying GA on KGW and HMRR of the earlier-flowered spikelets was greater than that of the later-flowered spikelets, but it was reversed on CD, AC, and CPC compared with spraying ABA.

Key words: Rice, Grain position, Quality, ABA, GA

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