气候因子对杂交稻金优组合结实率的影响研究

Studies on the Effects of Climatic Factors on Seed Setting Percentage of Jinyou Hybrid Combinations

采用分期播种和定穗观察的方法研究了不同气候因子对金优组合结实率的影响。结果表明，在相同气候条件下，金优组合与对照汕优、威优组合相比，结实率没有明显差异；对不良气候条件的抗逆能力相当。同时还得出。

The effects of major climatic factors in heading to filling stages including temperature, rainfall and sunshine time on seed setting percentage of hybrid combinations of Jin 23A such as Jinyou 63, Jinyou Gui 99 and Jinyou Wan 3 were studied by way of split seeding and panicle locating observation using Shanyou 63, Shanyou Gui 99 and Weiyou Wan 3 as the controls. The results showed that different climatic factors resulted in different seed setting percentages of all the hybrid combinations, but compared with the controls, the Jinyou combinations did not show much difference in seed setting percentage, even in the unfavourable climatic factors. The regression analysis between seed set and climatic factors indicated that the important factors influencing seed set were temperature and rainfall, especially the daily mean temperature in the filling stage and the rainfall during heading and flowering stage. Futhermore, different restorer lines made their hybrid combinations have different stability in seed set to different climatic factors. It has been found that the combinations of restorer Wan 3 have a better stability in seed set to temperature than those of restorers Minghui 63 and Gui 99.