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Acta Agronomica Sinica ›› 2010, Vol. 36 ›› Issue (05): 848-855.doi: 10.3724/SP.J.1006.2010.00848


Comparison of Multiplication of Endosperm Cell and Physiological Activity in Developing Kernels among Normal Corn, Glutinous Corn and Pop Corn

ZUO Zhen-Peng1,WANG Jing1,DONG Lu-Hao1,MA Deng-Chao2,SUN Qing-Quan1,*,DONG Shu-Ting1   

  1. 1Agronomy College of Shandong Agricultural University / National Key Laboratory of Crop Biology, Tai’an 271018, China; 2 Ji’ning Agricultural Science Institute, Ji’ning 272131, China
  • Received:2009-09-10 Revised:2010-01-08 Online:2010-05-12 Published:2010-02-09
  • Contact: SUN Qing-Quan,E-mail:qqsun18@163.com


The multiplication of endosperm cell and the physiological characteristics in developing kernels were investigated among normal corn, glutinouscorn and pop corn in this study. The number of endosperm cell, the traits of carbohydrate accumulation, the change of hormone content and the activities of enzymes related to starch corn, the process of kernel endosperm cell proliferation was earlier than that of the dry matter increase; the number of kernel endosperm cells reached the maximum at 24, 18, 13 days after pollination, while kernel weight at 45, 40, 30 d respectively. In the process of starch accumulation, the total content of starch of glutinous corn was higher than that of normal corn and pop corn at the same period, especially at 30 d after pollination and the difference was obvious, and that between normal corn and pop corn was not distinct; the difference of the speed of kernel starch accumulation among different types was mainly manifested in two aspects faster or slower and earlier or later for accumulation. The maximum of glutinous corn starch accumulation rate was 1.61, 1.34 times higher than that of normal corn and pop corn. The maximum rate of starch accumulation of glutinous corn appeared at 10 d after pollination, while that of normal corn and pop corn at 20 d after pollination. The number of endosperm cell was significantly correlated with the filling rate of kernel in normal corn at the 0.01 probability level, and in glutinous corn at 0.05 level, while not significantly correlated in pop corn. In kernel-filling period, the content of ZR was higher in normal corn than in glutinous corn and pop corn at the same period, moreover, in the glutinous corn than in pop corn. The differences among the three typesin the content of IAA, ABA, and GA3 were exactly opposite to those of ZR. The difference of SS activity among the three quality types was not significant, but in later kernel-filling stage, the SS activity declined slowly in normal corn and fast in pop corn fast. The average activity of SSS and synthesis were compared in different types of corn. The results showed that for normal, glutinous and popADPG-PPase of glutinous corn was significantly higher than that of normal corn and pop corn in the kernel-filling period. The average activity of GBSS of pop corn was higher than that of normal corn and glutinous corn. The activity of GBSS for pop corn kernel was the highest one in the three corn types.

Key words: Corn, Quality type, Kernel, Endosperm cell, Hormone, Enzyme activities

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