Isolation of Reciprocal Translocation Lines in Rice Mutations in rice induced by X-rays III
Other Title
水稻染色體相互轉座系統之分離 水稻經X線處理後所發生的突然變異之第三報
Journal
農業研究
Journal Volume
8
Journal Issue
3-4
Start Page
1
End Page
10
Date Issued
1959-12-01
Date
1959-12-01
Author(s)
Sung-Ching Hsieh
Tien-Ding Chang
Hsin-Chong Young
謝順景
張天定
楊行昌
Abstract
The semi-sterile plants induced by X-ray irradiation were studied cytogenetically. It was found that, semi-sterile plants gave 1 fertile and 1 semi-sterile segregation ratio; fertile ones bred true, while the semi-sterile ones continue to segregate as above mentioned manner. When the former was back crossed to original variety, it produced either all sterile or all fertile plants, and segregation of fertile and sterile plants was never seen whthin the same cross. Such a behaviour of inheritance of fertility was concluded as attributable to chromosomal interchanges caused by X-ray irradiation. Frequency of ring, chain and other types of quardrivalents which were varied 0-100% were found to be significantly correlated with percentage of seed sterility. It was assumed that “ring” and “zigzag” configulated chromosomes were equally frequent in the observed strains. Fifty five lines of heterozygote for interchange and twenty lines of homozygote for interchange were isolated from the two treatments, and the analysis of interrelation of chromosomes is being carried out.
本研究係探討在第一報所報告，X線處理後所發生的半不稔稻之細胞遺傳行為。半不稔稻在次代分離為結實稻及半不稔稻兩種，其比例為1:1，結實稻即固定並遺傳至後代，但半不稔稻則再以1:1之比例分離結實稻及半不稔稻。若將前者與原來未處理品種同交則產生全結實稻或全半不稔稻而無如上述之分離現象。若將後者與未處理原來品種同交則與上述同樣方式分離出，1結實稻及1半不稔稻。此種結實率之遺傳行為與相互轉座體者相似。為檢定相互轉座系統之真實性乃觀察其花粉母細胞之染色體行為，結果在肥厚期及第一中期發現環形(Ring type)，鏈形(Chain type)，蛹形(Ocoon type)十字形(Cross type)及Y形等各種形狀之四價染色體。其出現頻度介於0-100%之間。此等四價染色體與不稔率之間有顯著的相關(r=0.530)。此結果表示上述半不稔稻係由於染色體之相互轉座所致。
水稻之相互轉座可能在自然界中亦有發生，但所交換的染色體斷片(Interchanged segment)可能甚短不易察見，且可能不易產生如本研究中所發現之大轉座。
經過上述試驗已分離出53系統的轉座異型體(Reciprocal transfocation heterogyzote) 及20系統的轉座同型體，轉座同型體(R. T. Homozygote)間之分析正在進行中。
Publisher
農業試驗所
Type
journal article
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