Influence of Spacing on Heritability and Interrelationships among Agronomic Traits in the F2 Population of a Rice Cross

栽植密度影響水稻什交第二代後裔主要農藝性狀遺傳力及相關之硏究

張萬來(W. L. Chang)

《中華農業研究》 16卷2期 (1967/06) Pp. 14-21

https://doi.org/10.29951/JARC.196706.0002

摘要

水稻品種臺南3號，PiNo 4及其雜交第二代後裔分別種植於三種不同栽植密度卽疏植（行株距25×40分分），標準植（行株距25×20公分）及密植（行株距25×10公分）並從各栽植密度隨機選取單株調查有關農藝性狀。
每株穗數及每株谷重均隨栽植密度之增加而急減，株高，穗長與每穗粒數亦有遞減現象，生育日數及百粒重受栽植密度影響甚微。
每株穗數及每株谷重之遺傳力較低，而其他農藝性狀之遺傳力則較高，在疏植及標準環境下估計之遺傳力，一般言之，均較密植處理者爲高。
在密植區每株谷重與每株穗數及株高具有密切正相關，而在疏植及標準植區，其每株谷重與每穗粒數，穗重及穗長等性狀之相關極高。

並列摘要

Eight agronomic traits of a rice cross, Tainae 3×Pi No. 4, were studied in in the F2 population in the second crop of 1965 to 3 spacings, i.e., wide, standard, and close spacings with distance between rows and hills of 25×40, 25×20, and 25×10, respectively. Data for all traits were obtained on individual plants randomly selected.
Close spacing caused a drastic decrease in panicles and grain yield per plant whereas plant height, panicle weight, and grains per panicle decreased very slightly. Heading date and weight of 100-grain were practically not affected by spacing.
Estimates of heritability for panicles and grain yield per plant were low largely due to the low genotypic variance of F2 population. Heritabilities for other traits were in general higher. Heritability estimates for traits in wide and standard spacings were larger than those in close spacing.
Grain yield per plant was closely associated with panicles per plant and plant height in close spacing, and with grains per panicle, panicle weight, and panicle length in wide and standard spacing.