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Variation In F1 Fertility Of Distantly Related Crosses Among Cultiveated Rice
為探討栽培稻遠緣雜交F1不稔性之變異，本試驗以Silewh及臺□育3484與5個日本型品種及4個印度型品種進行7 ×7及6 ×6全互交F1及F2分離族群為材料，調查花粉稔性及種子稔實率。探討雜交不稔性之遺傳行為以及不同栽培時期對不稔性之影響。結果如下：
Variation in the F1 fertility of distantly related crosses among cultivated rice was commonly observed and was recognized as a heritable trait. A series of experiments including two diallel cross sets: a 7×7 diallel cross of Silewah, TKY3484 and 5 Japonica varieties, a 6×6 diallel crosses of Silewah, TKY3484 and 4 Indica varieties, and a total of 12 F2 populations were used as materials to understand the genetic behaviors of the F1 hybrid fertility and variation due to different planting dates. The pollen fertility and spikelet fertility, considered as index traits of fertility, were evaluated.
1. The pollen fertility and spikelet fertility of Silewah with Iaponica varieties were higher than with Indica varieties, and those of the first crop was higher than the second crop Similarly, the pollen fertility of TKY 3484 with Indica varieties were higher than with Japonica varieties, and those of the first crop was higher than the second crop. However, the differences between the first and the second crops were not signiticant different.
2. The pollen fertility and spikelet fertility of the five parents were similar in different planting dates. However, in different planting dates, the pollen fertility and spikelet fertility of hybrid F1 were significantly different.
3. Genetic analysis from the 7×7 diallel crosses of Japonica and the 6×6 diallel crosses of Indica, the pollen fertility and spikelet fertility were controlled dominant genes, The hybrids fertility was controlled by at least one major genes. Heritabilities of the pollen fertility and spikelet fertility in Japonica crosses were 63% and 54% in narrow sense, respectively. Heritabilitles of the pollen fertility and spikelet fertility in Indica crosses were 34% and 42% in narrow sense, respectively.
4. To study the segregation for pollen fertility and spikelet fertility of distantly related crosses in rice, six F2 populations were investigated. The F2 popultion might be chassified into two groups, i. e. normal and low fertility groups. The segregation pattern in F2 is regardes as 9 : 7, 13 : 3, 15 : 1, and 3 : 1, respectively. Those suggest that the hybrid sterility were induced by a set of complementary, inhibiting genes, duplicate genes, and a complete dominant gene, respectively.
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