秈稉稻雜交之遺傳育種研究　Ⅰ．單株穀產量之路徑係數分析

Genetical and Breeding Studies in the Crosses between indica X sinica Rices 1. Path Coefficient Analysis of single-plant Grain Yield

郭益全(Y. C. Kuo) ； 張德梅(T. M. Chang)

《中華農業研究》 30卷3期 (1981/09) Pp. 219-226

https://doi.org/10.29951/JARC.198109.0003

摘要

本研究以秈×稉與稉×秈等兩個雜交組合之F2集團爲材料，探討秈稉稻雜交後代產量構成要素對單株殼產量變異之決定程度，結果發現：兩種組合中，單株穀產量與產量構成要素間均呈極顯著之正相關。路徑係數分析結果則顯示兩種組合中，產量構成要素對產量變異決定程度的大小順序並不一致。在秈×稉組合中，對單株穀產量變異最具影響力之性狀爲穗數，其次爲平均一穗穎花數，再次爲結實百分率，終爲千粒重：稉×秈組合中，產量構成要素對單株穀產量變異之決定程度的大小則依次分別爲結實百分率、穗數、平均一穗穎花數、千粒重。文中曾對此等結果加以討論，並建議育種家從事秈×稉或稉×秈雜交育種時，穗數及平均一德穎花數爲譜系法選拔時之兩個重要選拔指標。

並列摘要

The prestent studies are to compare the effect of four yield components on the variability of single-plant grain yield of rice in indica×sinica and sinica×indica crosses by the technique of path coefficient analysis.
The significant positive correlations between four yield components and single-grain yield were observed in both crosses. From the path coefficient analysis, it was observed that the order and degree of effect of the respective yield component on the grain yield differed from cross combination The order of effect on grain yield was found to be number of panicles, mean number of spikelets, percent seed setting and 1,000 grain weight in the indica×sinica cross; and percent seed setting, number of panicles, mean number of spikelets and 1,000 grain weight in the sinica×indica cross.
It was suggeted that in rice breeding, number of panicles and mean number of spikelets should be used as the main selection criteria for selecting grain yield from either indica×sinica or sinica × indica cross.