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題 名 | 栽培稻(Oryza sativa)與野生稻(O. nivara)種間雜種及回交後裔族群糙米性狀之遺傳研究=Genetic Studies on the Brown Rice Characteristics in the Progenies Derived from the Hybrid and Backcross between Oryza Sativa L. and O. Nivara Sharma et Shastry |
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作 者 | 李長沛; 郭益全; 吳詩都; | 書刊名 | 中華農業研究 |
卷 期 | 49:2 2000.06[民89.06] |
頁 次 | 頁1-13 |
分類號 | 434.114 |
關鍵詞 | 栽培稻; 野生稻; 種間雜交; 回交; 糙米性狀; Oryza sativa; O. nivara; Interspecific hybridization; Recurrent backcross; Brown rice; |
語 文 | 中文(Chinese) |
中文摘要 | 野生稻O. nivara(IRGG Acc.104705)穀粒細長具褐色種皮為貢獻親,中國型稻臺?1號(TKI)及臺農67號(TNG67)穀粒短圓為輪迴親行雜交及回交,由各所得之F1、F2、BC1F1、BC1F2、BC2F1、BC2F2、BC3F1、BC3F2族群為材料探討糙米種皮顏色、粒長、粒寬及粒形等性狀的遺傳及育種行為。結果顯示:野生稻之褐色種皮為單一顯性基因所控制,且與其他三個糙米性狀無連鎖關係。兩組合F1之粒長具分顯性,F2超親分離者少。回交後代族群明顯集中且偏向輪迴親本,但恢復輪迴親本的程度因組合不同而有所差異。粒寬則僅TKI X O. nivara具雜種優勢,但F2兩雜交組均有超親分離現象;回交後代在TNG67 X O. nivara之粒寬變異均大於TKI X O. nivara粒形之頻度分布較集中。F2及各回交世代之粒長、粒寬及粒形等性狀之平均皆低於F1,顯示此三性狀基因累加性效應高,呈現回交次數增加而遺傳減少的趨勢,但TNG67 X O. nivara之粒寬於BC3F2世代,其廣義遺傳率仍高。在各F2世代粒形與粒長呈正相關,而與粒寬呈負相關;粒長與粒寬於早期世代F2及BC1F2無顯著相關性,於BC3F2呈正相關。 |
英文摘要 | Two sinica cultigens, Tainung 67 (TNG67) and Taiken 1(TK 1), and a wild rice, O. nivara (Acc. 104705) were used as the recurrent parents and door parent, respectively, to investigate the genetic behaviors for the seed coat(brain) color, grain length, grain width and grain shape (length-width ratio) of the interspecific hybrid progenies of Oryza species. The F₁, F₂, BC₁F₁, BC₁F₂, BC₂F₁, BC₂F₂, BC₃F₁, and BC₃F₂ populations of two cross combinations were simultaneously planted at the experimental farm of Taiwan Agricultural Research Institute in the first crop of 1996. In normal growth conditions, the seed coat color of O. nivara is brown, and the shape of grain is slender, on the other hand, two sinica cultigens are light brown in seed coat color and bold in grain shape. It is indicated from our data that the seed coat color is conditioned by one major gene, and brown seed coat is dominant. Furthermore, linkage was not found between seed coat color and grain length, width and shape of brown rice. Heterosis was found in grain length in both cross combinations. Few are transgressive in both F₂ populations, and the frequency distributions of grain length in various backcross populations are peaked are leaned toward the recurrent parents, cultigens. For grain width, heterosis was only found in TK 1 × O. nivara combination. However, transgressive segregation was indicated in both F₂ populations. Variation of grain width in various backcross populations TNG 67 × O. nivara combination appeared to larger than those in TK 1 × O. nivara. As for grain shape, bold shape was observed in both F₁ populations. Transgressive segregation was observed in both F₂ populations, and frequency distribution was peaked only in various backcross populations of TK 1 × O. nivara cross combination. In general, the mean performance for length, width, and shape of brown rice in F₂ and various backcorss populations were lower than those in F₁ populations, indicating that the genes concerned might be additive. The broad sense heritabilities estimated for the three grain traits were relative high in both F₂ and BC₁F₂, and heritabilities appear to lower along with increase in the number of backcross except grain width in BC₃F₂ population in TNG 67 × O. nivara combination. In F₂ populations of both cross combinations, it was found that there is a positive correlation between grain shape and length, and a negative correlation between grain shape and width in various populations. Data were also observed that there is no significant relationship between grain length and width in both F₂ and BC₁F₂ populations, however, a positive correlation was observed in BC₃F₂ populations. |
本系統中英文摘要資訊取自各篇刊載內容。