杂交水稻新组合德香4103的选育及高产原因初析

德香4103（德香074A／泸恢H103）是四川省农科院水稻高梁研究所选育的高产杂交水稻新组合，在四川省区试中平均比对照冈优725增产5．9％，且稻瘟病抗性和稻米品质均优于对照，2008年通过四川省品种审定。该组合高产的原因：一是因为日产量的提高而非生育期的延长；二是因为单位面积穗数和单穗重的协同增加，而以单穗重的贡献率更大，其中单穗重的提高主要是千粒重的增加所致。对超级稻的育种路线进行了讨论。

Breeding of New Hybrid Rice Combination Dexiang 4103 and Analysis of the Reasons for Its High Yield

Dexiang 4103(Dexiang 074A/Luhui H103) is a new high-yielding hybrid rice combination developed by the Rice and Sorghum Institute of Sichuan Academy of Agricultural Sciences.In Sichuan provincial regional trials,it yielded 5.9% higher than the check hybrid Gangyou 725 on average.It had also better blast resistance and grain quality than the control.In 2008,it was registered and released to commercial production by the Sichuan Provincial Crop Variety Appraisal Committee.The reasons for its higher yield were: 1) its higher daily grain yield rather than a longer maturity;2) the consonant increase of both grain weight per panicle and panicles per unit area with a greater contribution to yield from the former,resulting mainly from its heavier grains.The approach to breeding super rice was also discussed in this paper.