RICE SCIENCE ›› 2006, Vol. 13 ›› Issue (1): 34-42 .

• Research Paper • Previous Articles     Next Articles

Source-Sink and Grain-Filling Characteristics of Two-Line Hybrid Rice Yangliangyou 6

ZHAO Bu-hong 1,2, WANG Peng 1, ZHANG Hong-xi 2, ZHU Qing-sen 1, YANG Jian-chang 1   

  1. 1Key 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:2005-11-14 Online:2006-03-28 Published:2006-03-28
  • Contact: YANG Jian-chang
  • Supported by:
    the National Natural Science Foundation of China (30270778) and Chinese Ministry of Science and Technology (2001BA507A-09-01-03; 2004BA520A12-5).

Abstract: With two-line hybrid rice Yangliangyou 6 (YLY6) and Liangyoupeijiu (LYPJ) and three-line hybrid rice Shanyou 63 (SY63) as materials, the source, sink and flow characteristics in association with grain filling were investigated. The seed-setting rate, grain filling degree and grain yield of YLY6 and SY63 were significantly higher than those of LYPJ. The export and transformation percentages of the matter in culms and sheaths of YLY6 and SY63 were significantly higher than those of LYPJ. Activities of sucrose synthase, adenosine diphosphoglucose pyrophosphorylase, starch synthase and starch branching enzyme in grains were higher for YLY6 and SY63 than for LYPJ, and were very significantly correlated with maximum grain filling rate, mean grain filling rate, grain filling degree and grain weight. The spikelet number, grain yield and total sink load per area of vascular bundle and phloem of YLY6 and SY63 were significantly smaller than those of LYPJ, and the greater the load, the lower seed-setting rate and the poorer grain filling. The transportation rate per area phloem of YLY6 was greater than that of LYPJ or SY63. The results suggest that YLY6 possesses strong source, great sink activity and efficient flow, which lay a physiological base for its high seed-setting rate and good grain filling.

Key words: hybrid rice, source-sink characteristics, grain filling, enzyme activity