中国大豆不同生态类型开花至成熟期对光周期的反应

选用来自中国不同大豆生态区的１５个代表品种，比较了不同产地、不同生育期、不同播期类型的大豆品种开花后光周期反应的差异。结果表明，大豆品种在开花后光周期反应方面存在着广泛的遗传多样性。中国大豆典型生态类型开化后光周期反应敏感性有以下顺序：南方秋豆〉南方夏豆〉黄淮夏豆〉南方春豆、黄淮春豆〉北方春豆。试验中发现，大豆品种开花至成熟期各阶段长度与它们在自然条件下出苗至初花的日数正相关。供试的早熟品种开花后

A Study on the Responses of Different Ecotypes of Chinese Soybeans to Post-Flowering Photoperiod

Fifteen representative varieties from the main ecological regions in China were used to compare the responses of soybean varieties to post-flowering photoperiod. These varieties came from different original sites, had different growth period and belonged to diverse sown season types. The results showed that there was broad genetic diversity in the post-flowering pho-toperiodic responses in soybean varieties. The sequence of sensitivity of the typical ecotypes of Chinese soybeans was as follows: Autumn sown soybeans from South China > Summer sown soybeans from South China> Summer sown soybeans from the Yellow River and Huaihe River Valleys > Spring sown soybeans from South China and from the Valleys mentioned above > Spring sown soybeans from Northeast China. It was found that the durations from R1 to R8 of the pre-flowering short day indueed plants were correlated positively with the days from emergence to flowering (R1) of the plants under the natural photoperiod. The post-flowering response of early varieties was more sensitive than the pre-flowering response.