行政院農業委員會台南區農業改良場  研究彙報第14號

洋香瓜之育種(三)Monoecious性型之轉移及利用為母本之研究

黃賢良

摘  要

一、Monoecious性型為單一對顯性因子控制,F2分離比3.14:1(X2=0.03,p=0.5),可用回交法,轉移優良性狀至Monoecious品種,以利用為一代雜交種之母品種。

二、連續利用回交法,在短期年限內(F6)容易回交固定而達實用階段;利用回交自交更替法,可選拔更多複雜因子,但實用年限要延長(F10)。

三、Monoecious性型利用為母本,可提高一代雜種純度,而Andromonoecious性型常因兩性花花藥早熟及去雄不完全,容易混入自殖種子,影響F1種子純度。

四、Monoecious性型利用為母本,授粉率可由66%提高至95%,同時節省一半的授粉勞力。

五、雄不稔系統及全雌株之發生研究,尚未能達到普遍實用階段,Monoecious優良自交系之育成,在當前一代雜交種子之採種途徑上,即經濟且實用。


Breeding of Muskmelon Varieties (3)

Studies on the Transference of Monoecious Sex Expression and the Utilization for Female Parents

S. L. Hwang

Summary

1. Monoecious sex expression of muskmelon was controlled by one pair of dorminant gene, the segregated ratio was 3.14 to 1 (x2=0.03, p=0.5), we could transfer the good characters of andromonoecious varieties to monoecious varieties by back cross method for female parents of F1 hybrid seed production.

2. It could fix the inbred lines of monoecious sex expression easily and reach applying step in short period (F6) by back cross method series.  If using back cross-self pollinated alternated method, it could select more complicated gene, but it took times (F10) to reach the applying step.

3. Utilized the varieties of monoecious sex expression for female parents of F1 hybrid seed production could promote the purity of F1 hybrid seeds.  If using andromonecious varieties for female parents, the stamens of hermaphrodite usually matured during the bud stage and emasculated incompletely, so the self-pollinated seeds might mix with the F1 hybrid seeds and effect the purity of F1 seed.

4. Utilized the varieties of monoecious sex expression for female on F1 hybrid seed production could promote the pollinated percentage from 66% (andromonoecious) to 95% and save about 50% of labors.

5. The studies of male-sterility strains and gynoecious plant were under the applied step, but the bred of monoecious inbred lines were the economic and practices method on F1 hybrid seed production.



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