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经1986～1988年.先后对十八套不同亚种类型的光敏感核不育系,在江西南昌,连续三年进行分期播种试验,已得到如下主要研究结果:1.基本探明了供试的十八套不同粳、籼亚种类型的光敏感核不育系,在南昌(28°41′N)的育性转换时期、阶段及稳定性.经育性转换及杂一代优势观察,已筛选出育性转换、开花习性及经济性状较好的粳型双9—2S、28006S和籼型W6417S、W6154S、赣ⅢS等光敏感核不育系.2.不同亚种类型及同一亚种不同品种的光敏感核不育系,其育性转换特点有明显差异.一般规律:籼型核不育系,普遍存在不育期较长,转育较晚,同时可育期易受低温影响结实的特点;而粳型核不育系,则普遍较籼型核不育系的不育期为短,育性转换较早,不育期因高温影响,常有部分散粉自交结实现象,但可育期因低温影响结实不明显.3.鉴于不同亚种类型光敏核不育系的育性转换特点不同,结合其开花习性差异对杂交制种的影响,从育种应用出发,研究提出:我国长江中下游稻作区,水稻光敏核不育系的选育,应重点主攻籼亚种,首先突破早熟早籼为宜.在选材上优先考虑矮秆、抗病、优质以及开花习性好,柱头外露率高等性状.
From 1986 to 1988, eighteen sets of light-sensitive nuclear sterile lines of different subspecies were successively screened in Nanchang, Jiangxi for three consecutive years. The main results are as follows: 1. (18 ° 41’N) of fertility transformation stage, stability and stability of 18 different photoperiod-sensitive genic male sterile line with different japonica and indica subspecies genotypes in Nanchang (28 ° 41’N) The male sterile line Jingshuang 9-2S, 28006S and indica W6417S, W6154S and Gan Ⅲ S were selected for their fertility transformation, flowering habits and economic character.2.Different subspecies and different subspecies The varieties of light-sensitive nuclear sterile lines, fertility conversion characteristics have significant differences.General law: indica type of male sterile lines, widespread sterile period longer, late transfer, while the fertile period susceptible to low temperature and strong However, the japonica-type CMS lines generally had shorter period of sterile period and earlier fertility transition than indica-type sterile lines, and some self-pollination often occurred during the sterile stage because of high temperature. The fertile period is not obvious due to the influence of low temperature.3.Due to the different fertility conversion characteristics of different types of photosensitive genic male sterile lines Based on the application of breeding, we put forward that the breeding of rice-sensitive genic male sterile lines in the middle and lower reaches of Yangtze River in China should focus on the main indica subspecies, Indica is appropriate in the selection of dwarf priority, disease resistance, good quality and flowering habits, stigma exposed rate higher traits.