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Acta Agron Sin ›› 2006, Vol. 32 ›› Issue (06): 943-945.

• RESEARCH NOTES • Previous Articles     Next Articles

Effects of Weak Light on Rice Sucrose Content and Sucrose Degradation Enzyme Activities at Grain-Filling Stage

LI Tian1, OHSUGI Ryu2,YAMAGISHI Tohru2, SASAKI Haruto2   

  1. 1College of Agronomy, Sichuan Agricultural University, Ya’an 625014 Sichuan, China; 2Graduate School of Agricultural and Life Sciences, the University of Tokyo, Bunkyo-ku 113-8567, Tokyo, Japan
  • Received:2005-03-23 Revised:1900-01-01 Online:2006-06-12 Published:2006-06-12
  • Contact: LI Tian

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Abstract:

Two cultivars IR72 (Indica) and Nipponbare (Japonica) were used with shading treatment after anthesis to study the dynamic changes of sucrose content and the activity of sucrose degradation enzymes. The results showed that sucrose contents were decreased, sucrose degradation accelerated, sucrose synthase (SS) activity was decreased and both vacuolar invertase (VCI) and cell wall bound invertase (CWI) activities were increased under the weak light. The shading treatment was favorable to sucrose degradation by increasing invertase activity. Correlation analysis showed that starch filling rate in grains was positively and significantly correlated with sucrose synthase activity and cell wall bound invertase activity, which played an important role in sucrose degradation and starch synthesis.

Key words: Weak light, Sucrose content, Sucrose synthase, Vacuolar invertase, Cell wall bound invertase

CLC Number: 

  • S511
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