辽优1052及其亲本灌浆特性与源库关系的比较

对直立大穗型杂交稻辽优1052及其母本105B和父本C52做减源和减库处理,研究大穗型水稻品种籽粒灌浆特点。结果表明:三品种均为源限制型,都存在着两段灌浆现象。同一品种强弱势粒间灌浆过程差异较大。母本105B最终粒重较小,且强弱势粒间粒重差异较小;而杂交稻辽优1052及父本C52强弱势粒粒重差异较大。说明大穗小粒型品种源库矛盾较小。对于源限制型品种,减源能明显的缓和源库矛盾,尤其对最终粒重的提高有一定作用;而减库能加剧源库矛盾,使最终粒重降低。

Comparisons of Filling Characteristics and Source-Sink Relationship between Liaoyou 1052 and its Parents

Different treatments of reducing source and reducing sink were carried out on hybridize rice Liaoyou1052 with big erect panicle and its parents sterile line 105B and restored line C52. Characteristics of grains filling of rice varieties with big panicle were studied. The results showed that the three varieties were all source-limiting types and existed two processes in grain filling. The grain-filling processes had a big difference between the superior grains and inferior grains in the same rice variety. The sterile line 105B had a small average grain weight and the difference between superior and inferior grains was small. The source-sink inconsistency was moderate, but the difference was bigger between hybrids and restores line C52. Reducing source could decrease the source-sink inconsistency and raise the average grain weight for source-limiting type, but reducing the sink had an opposite result.