不同胞质效应甜玉米叶面积变化及穗部积累规律

摘要

[Objective] To explore leaf area change and ear's accumulation pattern in the growth process of different cytoplasmic effect′sweet corn. [Method] In field condition,taking normal cytoplasmic Xiangnongtianyu 2 and C-cytoplasmic male sterility Xiangnongtianyu 2 as the experi-mental materials,to analysis the leaf area change at different stages,the pattern of green corn,wet ear and 100-fresh-kernel weight after pollina-tion. [Result] Two types of sweet corn in different growth period had no significant difference in leaf area,the leaf area reached the maximum at spinning time,Change of the whole process presented"S" type curve. Integrating green corn,wet ear and 100-fresh-kernel weight after pollination of the normal cytoplasmic and the C-cytoplasmic male sterility sweet corn,to make sure the best harvest time of Xiangnongtianyu 2 was 34 d after pollination,C- Xiangnongtianyu 2's best harvest was 30 d after pollination. In addition,the 100-fresh-kernel weight was no significant difference between two types of sweet corn after pollination,the two types of sweet corn all can be independently used in the production. [ Conclusion] The study provided a scientific basis for reasonable planting and using or choosing timely harvest.%[目的]探索不同胞质效应甜玉米生长过程中叶面积的变化及穗部积累规律.[方法]在大田生长条件下,以正常胞质的湘农甜玉2号和不育胞质C型湘农甜玉2号2种胞质类型的甜玉米为种植材料,分析2种胞质效应甜玉米不同生育期的叶面积变化,授粉后不同时间青苞、净穗及鲜百粒重等的变化规律.[结果]2种胞质效应的甜玉米在不同生育期叶面积之间均差异不显著,在吐丝期分别达到最大叶面积值,整个变化过程均呈"S"型曲线;综合正常胞质和不育胞质甜玉米在授粉后不同时间里青苞、净穗、鲜百粒重等的变化,确定湘农甜玉2号在秋季的最佳采收期为授粉后34 d、C型湘农甜玉2号的最佳采收期为授粉后30 d,此外,2种胞质效应的甜玉米鲜百粒重在授粉后各时间差异均不显著,它们均可独立运用于甜玉米制种和生产.[结论]该研究可为合理种植和利用及适时采收不同胞质效应的甜玉米提供理论依据.