Zhai Huqu, Cao Shuqing, Wan Jianmin, Zhang Rongxian, Lu Wei, Li Liangbi, Kuang Tingyun, Min Shaokai, Zhu Defeng, Cheng Shihua
Rice Research Institute, Nanjing Agricultural University, 210095, Nanjing, China,
Sci China C Life Sci. 2002 Dec;45(6):637-46. doi: 10.1007/BF02879752.
The characteristics of dry matter production before and after heading and the relationships between photosynthesis of flag leaves and dry matter accumulation in panicles were investigated on super high-yielding rice cv. Xieyou 9308 (the yield of up to 12 t/ha) with rice cv. Xieyou 63 as a control. The results showed that (i) the capacity of dry matter production before and after heading in Xieyou 9308, i.e. biomass and daily dry matter production, was remarkably higher than that in Xieyou 63, especially after heading; (ii) CO(2) assimilation capacity in flag leaves in Xieyou 9308, namely Leaf Source Capacity (LSC), was also significantly higher than that in Xieyou 63, and the supply of photosynthate in leaves and the demand of grain filling were completely synchronous in Xieyou 9308, but photosynthetic function in flag leaves in Xieyou 63 declined sharply 20 days after heading and it was not enough to meet the demand of grain filling. These results confirmed that high efficient photosynthetic function in leaves after heading and its complete synchronization with grain filling are the key approaches to super high yield of rice.
以超级高产水稻品种协优9308（产量高达12吨/公顷）为材料，以协优63为对照，研究了抽穗前后干物质生产特性以及剑叶光合作用与穗部干物质积累的关系。结果表明：（i）协优9308抽穗前后的干物质生产能力，即生物量和日干物质生产量，显著高于协优63，尤其是抽穗后；（ii）协优9308剑叶的CO₂同化能力，即叶源量（LSC），也显著高于协优63，协优9308叶片光合产物的供应与籽粒灌浆需求完全同步，但协优63剑叶的光合功能在抽穗20天后急剧下降，不足以满足籽粒灌浆的需求。这些结果证实，抽穗后叶片高效的光合功能及其与籽粒灌浆的完全同步是水稻超高产的关键途径。
