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籼型水稻“B型莲源早”不育系的不育类型属配子体不育,杂种后代无育性分离,表现全可育。在单株植(一粒种子苗)情况下,参试的3个杂交组合的F_1都具有较大的产量优势,F_2仍保持一定的优势,但F_3除了一个组合外,优势则完全消失。F_2代优势降低的主要因素是有效穗的减少。F_3优势的下降,除了穗数的减少是主要因素外,粒数的减少也是原因之一。F_2、F_3有效穗的减少是分蘖力弱这一特性所决定的,适当增加插植苗数,可提高有效穗。本试验的3个组合F_2生育期的分离,对产量并无多大影响。据此认为,属配子体不育系所配出的某些组合杂种生产上除了应用F_1以外,如采用相应的措施来提高穗数,F_2的利用还是有可能的,F_3一般则不宜采用。
The sterile type of indica type “Lianbai Liangyuan” CMS line is male sterile with segregation of offspring of offspring, showing full fertility. In the case of single plantlets (one seedling), F_1 of the three crosses tested had a greater yield advantage while F_2 retained some advantages. However, except for one combination, the advantage of F_3 completely disappeared. The main reason for the decrease of F_2 generation advantage is the decrease of effective panicle. F_3 decline in the advantages, in addition to reducing the number of spikes is the main factor, the reduction of grain is one of the reasons. F_2, F_3 reduction of effective panicle tillering weakness is determined by this feature, the appropriate increase in the number of seedlings, can increase the effective panicle. The separation of the three combinations of F 2 in the test had no significant effect on the yield. Therefore, it is considered that some combinations of gametes derived from the male sterility of gametophyte should be used in addition to F_1. If the corresponding measures are used to increase the number of panicles, it is still possible to use F_2, while F_3 is not suitable for general use.