亚种间杂交稻母本与组合光合产物性状的相关性研究

Study on Photosynthates Characters Correlation of Hybrid Rice Female Parent and Their F_1 Hybrids Between Subspecies

亚种间杂交稻杂种优势利用是实现水稻超高产育种的一条重要途径,但其干物质转化率低成为亚种间杂交稻获得高产的瓶颈。为了进一步探索干物质转化率低的原因,探求生物学产量潜力与籽粒产量潜力的协调机制,以1个父本(R292),3个母本(Y58S、培矮64S、83S),3个亚种间杂交组合(Y58S/292、培矮64S/292、83S/292)和对照(岳优9113)为材料,研究了母本与组合光合产物性状的相关性。结果表明:(1)所有供试材料各个时期的可溶性糖与淀粉含量的变化呈动态趋势,可溶性糖含量以黄熟期最低,淀粉含量以黄熟期较高;(2)母本性状与组合性状存在着显著的正相关性;(3)4个部位中,均以茎秆穗颈可溶性糖含量最高,茎鞘和剑叶相对较低。

The utilization of hybrid rice heterosis between subspecies is an important way to prove rice breeding programs, but the low matter conversion rate of the hybrid becomes the bottleneck to get high yield. To further explore the reasons for the low conversion rate of dry matter and explore the coordination mechanism between biological yield＇ s potential and grain yield＇ s potential,the study whose materials are a male parent （R292）, three female parent （Y58S, Peiai 64S and 83S）, and three hybridized combinations between subspecies （Y58S/292,64S/292,83S/292） and contrast （ Yueyou 9113 ） , were selected for this studied to identify the correlation of the agronomic characters among the female parents and their F1 hybrids. The results show that： （1） In all the periods the soluble sugar and starch content of all the selected materials showed a dynamic trend, and the highest starch content is at the yellow maturity stage while the lowest soluble sugar content is at the yellow maturity stage;（2） Notable positive correlation appeared between the agronomic characters among the fe- male parents and their F1 hybrids;（3） In the four parts, stem has the highest content followed by panicle while stem - sheath and flag leaf are relatively low. Therefore, in the proposition of guaranteeing the rice yield advantage of biological yield and the large database and so on advantages between subspecies, choosing superior parent to improve the their F1 hy- brids＇ characters ,will be an important approach to the future development of hybrid rice between subspecies.