不同播期对杂交稻组合K优8615亲本制种性状的影响

目的]为了进一步提高K优8615的制种产量,促进其推广应用。方法]以K18A和泸恢615为试验材料,各设3个播期调查其播始历期、始花期、花时、有效穗数等性状。结果]K18A和泸恢615的3个播期的播始历期均随播期的推迟而缩短。K18A的抽穗时段第1期比第2、3期长2 d,从始穗到盛花第1期比第2、3期多1 d,第23、期的花时比第1期早20 min;第12、期的有效穗数比第3期多1穗,3个播期每穗粒数分别为139.3、135.9和133.7粒。泸恢615的3个播期的抽穗时段均为4 d,第1期有效穗数比第23、期多1穗,每穗粒数分别为157.81、63.2和159.3粒。结论]不同播期对K18A播始历期、抽穗时段、盛花期、花时、有效穗数和穗粒数都有一些影响,对泸恢615的播始历期有较大影响。

Influences of Different Sowing Dates on the Seed Production Characters of Parents of Hybridized Rice Combination Kyou 8615

Objective] The study aimed to increase the seed production yield of Kyou 8615 further so as to promote its popularization and application.Method] With K18A and Luhui 615 as tested materials,3 sowing dates were set up to investigate their characters such as durations from seeding to heading,beginning date of blooming,blooming time and effective ear number.Result] The durations from seeding to heading of K18A and Luhui 615 sowed on the 3 dates shortened along with the delaying of sowing date.The heading period of K18A sowed on the 1st date was 2 d longer than that on the 2nd and 3rd dates,its period from initial heading to full blooming on the 1st date was 1 d more than that on the 2nd and 3rd dates and its blooming time on the 2nd and 3rd dates were 20 min earlier than that on the 1st date;its effective ear numbers on the 1st and 2nd dates were 1 ear more than that on the 3rd date,the grain numbers per ear for 3 sowing dates were 139.3,135.9 and 133.7 grains resp.Conclusion] Different sowing dates had some influences on the duration from seeding to heading,heading period,full blooming period,blooming time,effective ear number and grain number per ear of K18A and had bigger influences on the duration from seeding to heading of Luhui 615.