论文部分内容阅读
以61个杂交晚稻组合组成供试群体,综合运用多种统计方法对单位面积产量与产量相关性状的相互关系进行了剖析,以期为我国长江中游南部稻区尤其是江西生态条件下杂交晚稻的高产育种提供科学依据。结果表明,在产量已达到较高水平的情况下,杂交晚稻高产育种的方向必需着重选配大穗、大粒型的组合,但除此之外,还必需在保证较高有效穗数的基础上寻求有效穗数与大穗、大粒的协调结合。通过成穗率高的选择,不仅对提高新组合的产量水平具有正效应,而且成穗率可以作为一个核心性状协调多穗与大穗、大粒之间的矛盾,进而实现有效穗数多与大穗、大粒在更高水平上的结合,从而获得更高的产量。在实现有效穗数多与大穗、大粒在更高水平上的协调结合的基础上,提高结实率也是必需顾及的一个方向;其中的关键是打破结实率与每穗总粒数之间的不利相关。
A total of 61 hybrid late rice combinations were selected as test groups, and the correlation between yield per unit area yield and yield-related traits was analyzed using various statistical methods in order to provide high yield of hybrid late rice in southern rice in the middle reaches of the Yangtze River, especially in Jiangxi Province Breeding provide scientific basis. The results showed that in the case that yield had reached a high level, the direction of high yielding breeding of late hybrid rice must focus on the combination of big spike and large grain type. However, in addition to the above, Seek the effective spikes and large ears, large grain coordination. Through the selection of high spike, not only has a positive effect on improving the yield of the new combination, but also the spike rate can be used as a core character to coordinate the contradiction between multiple spike and big spike and large spike, Spike, large grain at a higher level of combination, resulting in higher yield. In the realization of the effective panicle with large spike, large grain at a higher level based on the coordination and integration, to improve the seed setting rate is also necessary to take into account the direction of which the key is to break the seed setting rate and the total number of grains per panicle unfavorable Related.