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《Chinese Journal of Rice Science》 2003-01
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Changes in Endopeptidase Activity in Rice Leaves During Photosynthetic Declination

DENG Zhi rui 1,2 , LU Wei 1, ZHANG Rong xian 1,* , XU Xiao ming 1 ( 1 Institute for Rice Research, Nanjing Agricultural University, Nanjing 210095; 2College of Life Sciences, Shanghai University, Shanghai 200436; *Corresponding author)  
Two japonica rices, Wuyujing 3 and 97 7 were used to study changes in contents of soluble protein, free amino acids and endopeptidase activity during photosynthetic declination. Results showed that the content of soluble protein in flag leaves of Wuyujing 3 was higher than that of 97 7, but decreased faster. Free amino acids in flag leaves and the thirteenth leaves of Wuyujing 3 started to increase 10 days before the turning point of photosynthetic declination (TPPD), while it occurred just 1-2 days before TPPD of 97 7. During reversible phase of photosynthetic declination, endopeptidase activity kept in low level and increased slightly only in the later part of this phase, then they increased sharply at irreversible phase and reached a very high level. For Wuyujing 3, the change in endopeptidase activity in the thirteenth leaf was parallel to that in flag leaf, but for 97 7, the sharp increase of endopeptidase activity came later than that of flag leaf. It implied that, compared with Wuyujing 3, the procedures of protein breakdown and transfer to transportable nitrogen in 97 7 leaves were slower during photosynthetic declination, and this may be one important reason for relatively low seed setting rate and the incomplete use of its high yielding potentiality.
【Fund】: 国家重点基础研究 (973)专项经费资助项目(19980 1 0 1 0 0 )
【CateGory Index】: S511
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