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杂交稻种子的纯度与制种产量和不育系纯度有一定关系。研究表明:制种田不育系内保持系穗子的多少决定着杂交种内余株的多少,荣林中保持林与不育林的比例为2.254:1;在每亩母本有效穗≥25万的情况下,制种亩产≥150公斤,保持系穗单项《6.59%,或制种亩产量达到146.8公斤,不育系中保持系比例≤6‰,均能保证种子纯度达到国颁二级标准。
The purity of hybrid rice seed has a certain relation with the yield of seed production and the purity of CMS. The results showed that: the number of maintainer lines in CMS system determines the number of the remaining plants in hybrids, the ratio of forest to sterile plant in Ronglin is 2.254: 1, and the effective spike ≥25 In the case of 10,000, seed production per mu ≥ 150 kg, to maintain single spike ear "6.59%, or seed production per mu reached 146.8 kg, sterile lines to maintain the proportion of ≤ 6 ‰, can ensure the purity of the seeds Achieve State Award two standards.