应用品种间杂交使基因重组,至今仍是选育水稻优良品种的有效方法。新的优良品种,首先应当具有较高的产量水平。与构成产量有关的数量性状的遗传,大多为多基因所控制,容易受环境条件的影响而发生不能遗传的变异,它与可遗传的变异,往往相混在一起.同时,这些性状之间还存在着种种相关性,这就给有效的选择带来困难。近年来,科学工作者选用不同材料对水 It is still an effective method to breed fine varieties of rice by crossing recombinants with genetic recombination. The new fine varieties, first of all, should have a higher level of output. The genetic traits associated with the quantitative traits associated with yield are mostly controlled by polygenes and are susceptible to genetic variation due to environmental conditions and are often mixed with heritable variation and are also present between these traits With all kinds of relevance, this presents difficulties in making effective choices. In recent years, scientists have chosen different materials for water