[Yield-formation and source-sink characteristics of rice genotypes under two different eco-environments]

With nine Japanese varieties and two local cultivars of rice as test materials, this paper studied the characteristics of their yield-formation and source-sink characteristics under different eco-environments of Nanjing and Lijiang. The results showed that eco-environment had an obvious effect on rice grain yield and dry matter accumulation. High-yielding rice genotypes could accumulate more dry matter, especially in their late growth period. They had higher total spikelet number, leaf area index (LAI) and crop growth rate (CGR), as compared with other genotypes. The grain yield increased with increasing total dry matter accumulation, and significantly positively correlated with dry matter accumulation after heading, total spikelet number, LAI, and spikelet/leaf area ratio. The results suggested that the lower grain yield in Nanjing than in Lijiang was mainly resulted from the lower LAI, total spikelet, dry matter accumulation and CGR after heading.