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Acta Agron Sin ›› 2009, Vol. 35 ›› Issue (9): 1744-1748.doi: 10.3724/SP.J.1006.2009.01744

• RESEARCH ACTIVITIES • Previous Articles     Next Articles

Coordination between Source and Sink in Super Early and  Late Rice

YUAN Xiao-Yue1,PAN Xiao-Hua1,*,SHI Qing-Hua1,WU Jian-Fu1,QI Ying-Xue2   

  1. 1 Key Laboratory of Physiology, Ecology and Cultivation of Double Cropping Rice, Ministry of Agriculture / Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education / Jiangxi Agricultural University, Nanchang 330045, China; 2 Jiangxi Soil and Fertilizer Extension Station, Nanchang 330046, China
  • Received:2009-02-22 Revised:2009-05-02 Online:2009-09-12 Published:2009-07-04
  • Contact: PAN Xiao-Hua, E-mail:xhuapan@163.com; Tel: 0791-3813490

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Abstract:

In order to clarify the super higher yield mechanism of super early and late rice, we studied the source and sink characteristics under field conditions. Compared with non-super rice cultivars (control cultivar), the total sink capacity, ratio of grain-leaf area and ratio of grain-vascular bundle of super rice were higher, and positively and significantly correlated with grain yield. During filling stage, the ratio of source increase to sink of super early and late rice was slightly higher than that of control cultivars, but in the mid-late filling stage (10–25 d after heading) of early rice and the early filling stage (0–10 d after heading) of late rice, the ratio was significantly larger than that of control cultivars. The initialgrain-filling rate and mean grain-filling rate of super early and late rice were higher than those of controlcultivars, and positively and significantly correlated with filled grain rate and yield respectively. The degradation rates of root activity of super early and late rice after heading were lower than those of control cultivars, while the temperature depression (difference between air temperature and leaf temperature) was higher than that of controlcultivarsexcept early rice Zhuliangyou 819 and late rice Ganxin 688. The degradation rate of root activity and the temperature depression were negatively and positively, correlated with grain yield, respectively. The results suggested that larger total sink capacity and better coordination between source and sink should be the important mechanism for super higher yield in super early and late rice cultivars.

Key words: Super Rice（O. sativa L.）, Early rice, Late rice, Yield, Source and sink Characteristics

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