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近两年来,我省一些地方繁制的杂交水稻新不育系D汕A,因沿用传统的杂株鉴别方法去杂,将一些不育株误认为杂株去掉,而不少保持系杂株却“漏网”。田间去杂不彻底,配制的D优63田间杂株率高达4～6%,使水稻产量有不小的损失。为了提高种子纯度,各地都及时采取了措施,组织人力物力狠抓田间去杂工作。通过改进田间除杂技术,去年我地区繁殖的300多亩D汕A全部通过检查验收,田间纯度达到国颁标准。在杂株识别方法上,除采用常规鉴别法外,还着重从以下几方面加以识别。 1.茎秆高矮,粗细鉴别法。保持系杂株比不育系群体早穗4～5天,母本抽穗时保持系的组织细胞已逐步成熟,九二○对它无明显的伸长效果,
In the past two years, the new CMS line D Shantou A in some parts of our province has been misused as a miscellaneous strain because some traditional sterile strains were used to identify miscellaneous strains. However, But “slip net ”. Not thoroughly to the field to the complex, prepared D You 63 field hybrid rate as high as 4 ~ 6%, so that there is a considerable loss of rice yield. In order to improve the purity of the seeds, all localities took timely measures to organize the manpower and resources and pay close attention to the field work. By improving the field of impurity removal technology, last year, 300 acres of breeding in our region D Shantou A all through the inspection and acceptance, field purity reached the national award standards. In the identification of hybrid strains, in addition to using conventional identification method, but also focused on the following aspects to be identified. 1. Stem height, thickness identification method. The maintainer lines were 4 to 5 days older than the male sterile lines. The tissue cells that maintained lines at the time of heading were gradually matured. However,