Abstract: Comparisons of photosynthesis, respiration, accumulation and transportation of stem-sheath nonconstructural carbohydrate and grain filling characteristics were made for five rice cultivars at different stages in order to select fine forage rice cultivars. The results demonstrate that their carbon metabolisms differ from each other. Hybrid rice Weiyou 56 shows intense carbon metabolism because of strong photosynthesis and respiration, huge accumulation of nonconstructural carbohydrate in stem-sheath at booting stage, high transportation rate of nonconstructural carbohydrate from stem-sheath to panicle after heading, and slowly decrease of grain filling velocity during later period of milk stage. Common rice Fufengzao 92-124 remains high intensity of photosynthesis and speedy velocity of grain filling in later period of milk stage and least residue rate of nonconstructural carbohydrate in stem sheath at maturity stage. It could be another available forage rice cultivar with desirable carbon metabolism characteristics during later period of milk stage.

Key words: carbon metabolism, forage rice, grain filling, nonconstructural carbohydrate

摘要： 结合饲料稻品种选育，在不同生育期对5个水稻品种（组合）进行了光合作用、呼吸作用、茎鞘非结构碳水化合物的积累和转运以及籽粒充实特性的比较研究。结果表明，不同品种其碳素代谢特性各不相同，杂交组合威优56光合作用、呼吸作用较强，茎鞘非结构碳水化合物在孕穗期积累丰富，到成熟期残留较少，后期籽粒充实速度下降缓慢，是一个碳素代谢十分旺盛的组合。常规稻辐丰早92－124在灌浆后期仍维持较高的光合强度和较强的籽粒充实速度，且成熟期茎鞘内非结构碳水化合物残留最少，也是一个后期碳素代谢较为理想的水稻品种。

关键词: 湖南农业大学资源系, 湖南农业大学理学院