Agronomic Performance of the F1, F2 and F3 Generations of Rice Crosses

水稻第一、二、三代雜交後裔若干農藝性狀之雜種優藝

張萬來(W. L. Chang) ； 林恩輝(E. H. Lin)

《中華農業研究》 21卷3期 (1972/09) Pp. 165-174

https://doi.org/10.29951/JARC.197209.0002

摘要

嘉義農業試驗分所自民國59年第一期作至60年第二期作觀察水稻F1 F2與F3組合在若干農藝性狀之表現。F1 21個組合平均稻谷產量對高產量親本、中問親本及對照親本所示之雜種優勢，分別爲6.7，12.9%與19.2%。F2產量分別爲高產量親本、中問親本及對照品種之95.6%，101.4%與111.9%，雜種優勢平均遞減率爲6.4%。F3產量分別為高產量親本、中間親本及對照親本之93.4%，99.0與109.8%，其雜種優勢之平均遞減率爲9.3%。
Fl之生育日數多較早熟親本為短，惟其早熟性隨世代之推進而消失。株高之雜種優勢F1、F2與F3各世代相若。就每株穗數而言，F1只對中間親本與對照品種顯示雜種優勢，而F2與F3則無任何雜種優勢之表現。

並列摘要

The performance of grain yield, days to heading, plant height, and number of panicles per hill was evaluated in the F1, F2 and F3 generations of early maturing japonica, indica, and late maturing japonica crosses at the Chiayi Agricultural Experiment Station over the 3-crop period from the second crop of 1970 to the second crop of 1971. The mean F1 yield of all 21 crosses was 6.7, 12.9, and 19.2% greater than the higher parent, mid-parent and check variety, respectively. The F2 yield, relative to the higher parent, mid-parent, and check variety was 95.6, 101.4, and 111.9%, respectively. The average percentage of decrease of heterosis for grain yield from F1 to F2 was 6.4%. The mean F3 yield of 10 late maturing japonica crosses was 93.4, 99.0 and 109.8% of the higher parent, mid-parent, and check variety, respectively. The average percentage of decrease of heterosis for grain yield from F1 to F3 was 9.3%.
F1 generally headed earlier than parental varieties but this earliness disappeared gradually with the advancement of generations. The heterosis for plant height varied slightly with generations. The F1 showed no heterosis for number of panicles per hill in relation to higher parent but produced more panicles per hill than mid-parent and check variety. There was no heterosis for panicles per hill in F2 and F3 generations.