论文部分内容阅读
一.种子的异质性与其后代生产力密切相关种子的异质性表现在生长在同一植株或同一穗(或花序)上不同部位的籽粒,它的形态、重量、结构、含有成分都有所不同;用这些不同部位的种子来播种,其后代的生活力、分枝、开花结果部位、成熟期等也有所差异。因此在农业生产上的种用材料,必须很好的利用这种遗传性上的异质性,来提高农产品的产量和质量。据报导,燕麦穗底部子实中的胚,在发芽后形成5条初生根,中部子实的胚形成4条初生根,而顶部的子
I. Heterogeneity of seeds is closely related to the productivity of their offspring. The heterogeneity of seeds is manifested in the fact that the grains grown on the same plant or in different parts of the same ear (or inflorescence) have different forms, weights, structures and compositions ; Sowing seeds with these different parts also has differences in viability, branching, flowering parts, maturity, and the like of their offspring. Therefore, in the agricultural production of materials used, we must make good use of this hereditary heterogeneity, to improve the yield and quality of agricultural products. It has been reported that the embryos in the bottom of the oat ears form five primary roots after germination and the embryo in the middle forms four primary roots while the top ones