Combining ability for low-temperature tolerance in rice
Combining ability for low-temperature tolerance in rice
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DOI：
10.1142/9789812814265_0052
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
R. N. Kaw;G. Khush
中科院分区：
文献类型：
--
作者：
R. N. Kaw;G. Khush
对102个杂交稻F1组合和23个亲本进行了苗期、苗期、孕穗期和开花期的耐低温性鉴定。籼型亲本的出苗系数、开花期、可育小穗数、可育小穗衰退和育性衰退的平均值较高。粳稻亲本的苗高、耐冷指数和结实率较高。籼粳杂种在营养生长期表现出较高的耐冷性，而在生殖生长期表现出较低的冷稳定性。籼/籼杂种的可育小穗数和结实率的平均值较高，开花较晚。在低温下抗寒性和出苗能力的措施的相关性表明，这些反应是不同的控制，只有部分由相同的遗传机制。苗高与早期苗期和苗期的耐受指数的高度显着关联表明这些性状的遗传相似。早期苗高和各阶段的耐寒指数是反映营养生长期抗寒性的有效指标。生产力较高的籼型或籼/籼杂交种在苗期表现出较不耐寒的哈代。苗高、所有耐冷指数、孕穗期可育小穗数和育性百分率似乎主要受加性基因作用，因为它们的一般配合力方差比特殊配合力方差大。出苗率、孕穗期开花时间和开花期可育小穗数的遗传均以非加性基因作用为主。亲本本身的表现是反映其苗高、耐冷指数、开花期和可育小穗数一般配合力效应的良好指标。结果表明，Barkat是营养生长期耐冷性最好的组合，其次是Stejaree 45、K332、SR 3044-78-3和SR 5204 -91-4-1。在生殖生长期的冷稳定性方面，K39-96、中国988、Shoa-Nan-Tsan、Leng Kwang和Suweon 287是较好的组合。高等级相关性表明高一致性的基础上的一般性分析效应和阵列的平均值的排名。
One hundred and two F1 rice hybrids and 23 parents were evaluated for low-temperature tolerance at the early seedling, seedling, booting, and flowering stages. The indica parents had higher mean values for emergence coefficient, flowering duration, number of fertile spikelets, depression in fertile spikelets, and depression in fertility. The japonica parents were high in seedling height, cold tolerance indices, and percent fertility. The japonica/indica hybrids showed high cold tolerance at the vegetative growth stage and low cold stability at the reproductive growth stage. Indica/indica hybrids had high mean values for number of fertile spikelets and percent fertility and were later flowering. The correlations of measures of cold hardiness and emergence ability at low temperature suggest that these responses are controlled differently, and only in part by the same genetic mechanism. Highly significant associations of seedling height with tolerance indices at the early seedling and seedling stages suggest similarity in the inheritance of these traits. Seedling height at the early seedling stage and tolerance indices at any stage appear to be highly effective indicators of cold hardiness at the vegetative growth stage. More productive indicas or indica/indica hybrids appear to be less cold hardy at the seedling stage. Seedling height, all cold tolerance indices, number of fertile spikelets at the booting stage, and percent fertility seem to be predominantly under additive gene action because of their higher magnitude of estimated general combining ability (gca) variances compared with specific combining ability variances. A preponderance of non-additive gene action was revealed in the inheritance of emergence coefficient, flowering duration at the booting stage, and number of fertile spikelets at the flowering stage. The parental performance per se was a good index of their gca effects for seedling height, cold tolerance indices, flowering duration, and number of fertile spikelets. The cultivar Barkat was identified to be the best general combiner for cold tolerance at the vegatative growth stage, followed by Stejaree 45, K332, SR 3044-78-3, and SR5204-91-4-1-all japonicas. For cold stability at the reproductive growth stage K39-96, China 988, Shoa-Nan-Tsan, Leng Kwang, and Suweon 287 were good combiners. High rank correlations indicated high concordance in the rankings based on gca effects and the array means.