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題 名 | 栽培水稻遠緣雜交標識基因異常分離(2)--位於第4染色體之d-2,Pl,lg及lk-i基因=Distorted Segregation of Marker Genes in Wide Crosses of Rice (Oryza Sativa L.)(2)--d-2,Pl,lg, and lk-i Genes Located in the Chromosome 4 |
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作 者 | 羅義植; 吳詩都; 曾富生; | 書刊名 | 中華農學會報 |
卷 期 | 175 1996.09[民85.09] |
頁 次 | 頁21-37 |
分類號 | 434.114 |
關鍵詞 | 水稻; 遠緣雜交; 標識基因; 異常分離; 受精競爭基因; 連鎖群; Distorted segregation; Gametophyte gene; Linkage group; Marker gene; Oryza sativa L.; Wide cross; |
語 文 | 中文(Chinese) |
中文摘要 | 為探討栽培水稻遠緣雜交後代標識基因之異常分離的遺傳行為,本試驗以秈型栽培水稻5個品種(新竹矮腳尖、臺中秈3號、臺中在來1號、BG35-2及Pankai)與帶有標識基因之4個稉稻品系(CH-104具夷型矮性基因(d-2)、CH-105具紫色葉基因(Pl)、CH-106具無葉舌基因(lg)及CH-107具長粒型基因(lk-i)進行雜交。將15個雜交組合之F₁種子分別種植於桃園、臺中及屏東等三個不同地區及不同水耕栽培處理(重氮肥、高溫、低溫、缺硼),調查F₁的稔實率。並將各地區之F₁單株的F₂種子種植在臺中中興大學,調查各供試之標識基因在F₂族群之異常分離現象。再由不同水耕處理,正反雜交、回交後代及F₃系統分析受精競爭基因造成標識基因之異常分離並標定受精競爭基因與標識基因之連鎖關係。 15雜交組合之F₁種植於桃園、臺中及屏東三個地區的稔實率介於44~84.3%之間。而在不同水耕處理栽植之新竹矮腳尖×CH-105之F₁之稔實率介於11.22~29.23%均呈明顯降低現象。所有參試雜交後代之種子的發芽均正常而且其F₂個體並無雜種弱勢出現。四個標識基因在所有雜交組合F₂世代均呈異常分離,同樣水耕處理者亦有類似結果。Pl及lg與秈稻間之正反雜交組合之F₂族群,皆呈異常分離。以標識基因為父本進行回交時,其回交後代呈1:1之分離比,但以F₁為父本之回交,則呈異常分離。因此推論異常分離可能不是F₁無法發芽、F₁不稔性、F₂弱勢、配子發育基因、細胞質基因及環境淘汰之作用等原因所引起,而是受精競爭基因(gametophyte gene: ga)造成。 本試驗所釐定之受精競爭基因的符號為ga-16(t)及ga-17(t)。由F₃系統之連鎖分析結果,得知第四染色體之d-2,Pl,lg及lk-i四個標識基因與受精競爭基因之連鎖關係為d-2與ga-16(t),Pl及lg與ga-6,lk-i與ga-17(t)之組換值:d-2與ga-16(t)為13.2±4.2%;Pl及lg與ga-6各為8.3±3.2%及31.4±4.62%;而lk-i與ga-17(t)為13.7±3.6%。 |
英文摘要 | The purpose of this study was to elucidate the genetic mechanism of the distorted sergregation of marker genes in wide crosses. Five Indica varieties were sued as maternal parents for the crosses in this study. The 4 linkage testers used included 4 strains carrying a marker gene, i.e., d-2 (ebisu dwarf), Pl (purple leaf), lg (liguleless) and lk-i (long grain) on chromosome 4 which can be distinguished by morphological traits. The F₁ plants were grown in Taoyuan, Taichung, and Pingtung areas or grown hydroponically under heavy nitrogen, high temperature, low temperature, or borondeficient. Pooled data from 3 locations indicated that the seed fertility rates of F₁ hybrids ranged from 44 to 84.3% fro Indica×Japonica (linkage tester) crosses. The F₁ feed fertility rates ranged between 11.22 and 29.23% under hydroponical culture conditions. Four genes showed distorted segregation in the F₂ populations from all crosses. The transmission rates of 2-2/d-2, Pl/Pl, lg/lg and lk-i/lk-i homozygotes were 10.00-15-16%, 32.89-35.71%, 20.66-21.22% and 2.10-3.72%, respectively. When F₁ hybrids was cultured under hydroponical conditions, the distorted segregation of Pl and lg genes in the F₂ populations was similar to those derived from F₁ hybrids grown in different locations. Results from reciprocal crosses indicated distorted segregation of the gene in the F₂ populations. In backcrosses with d-2, Pl and lg testeres as the paternal parents, the ratio of dominant to recessive plants fitted the expected 1:1 value, indicating monogenic segregation. However, for backcrosses with linkage testers as the maternal parents, the segregation of these genes that the distorted segregation in this case was caused by a gametophyte gene. The distorted segregation of gene d-2, Pl, lg and lk-i were caused by the same gametophyte gene. The genes for gametic effects recorded in this study was symbolized as ga-16(t), ga-6 and ga-17(t). The results from both F₂ and F₃ populations indicated that the recombination values between the gametophyte gene and the marker gene was different among locations. The weighted means of recombination values between d-2 and ga-16(t), Pl and ga-6, lg and ga-6, and lk-i and ga-17(t) on chromosome 4 were 13.2±4.2%, 8.3±3.2%, 31.4±4.6%, and 13.7±3.6%, respectively. |
本系統中英文摘要資訊取自各篇刊載內容。