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頁籤選單縮合
題 名 | Restriction Fragment Length Polymorphisms in the USDA Soybean Germplasm from Central China=源自華中地區之美國農業部大豆種源庫之核酸限制酶切割長度多形性分析 |
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作 者 | Chung, Myong Gi; Chung, Mi Yoon; Johnson, April D. Clikeman; Palmer, Reid G.; | 書刊名 | Botanical Studies |
卷 期 | 47:1 民95.01 |
頁 次 | 頁13-21 |
分類號 | 434.214 |
關鍵詞 | 基因變異; 預選; 核酸限制酶切割長度多形性; 美國農業部大豆種源庫; Genetic variation; Glycine max; Pre-selection; RFLPs; USDA soybean germplasm collection; |
語 文 | 英文(English) |
中文摘要 | 為評估源自中國中部之美國農業部大豆種源庫之基因變異度,共107登錄樣品之46基因座(loci)以核酸限制酶切割長度多形性(RFLP)分析之。我們比較逢機取樣和預先選拔兩組試驗材料之基因變異度;比較項目有:根尖螢光,成熟期之形態,以及共10種酵素之同功酶型。我們也同時評估此107源自華中之登錄樣品之基因變異度,其方法為:和在美國先前已研究過的且具劃時代意義之栽培品種(NAC, n= 64)。最後,我們估算六個中國省份(安徽、甘肅、河南、江蘇、陝西、和山西)之品種的基因歧異分化度。如以每一基因座(locus)所含之平均的相對基因(allele)數(A, 2.44 vs. 2.13),及相對基因之豐富度(2.23 vs. 2.10)兩參數為憑,則上述預先選拔組和逢機取樣組兩者之間有顯著差異。但是,前者(He=0.393)維持基因差異度(或稱期望之歧異度,He)相似於後者(He=0.394)。此乃因:事實上預先選拔組所發現之很多相對基因是以低頻存在的(平均有效相對基因數,Ae = 1.72)。在預先選拔組所發現之分佈較廣之相對基因暗示:以同功酶為根據所選擇出之預先選拔組可能適用於篩選具較多數目之RFLP相對基因的基因庫收集樣品。源自華中之登 錄樣品(n = 107)維持較高水平之基因變異度(He = 0.405, A= 2.50)當以NAC(He = 0.339, A = 2.08)為比較基準時。我們檢測出上述六個省份樣品間有顯著的基因分化(平均G□= 0.133)。這些結果暗示:來自中國各地區或省份之美國農業部種源庫之登錄種源可用來強化美國大豆品種之基因變異度。 |
英文摘要 | To evaluate levels of genetic diversity in USDA soybean germplasm from central China, 107 accessions were examined at 46 RFLP loci. We compared genetic diversity in randomly selected accessions with pre-selected accessions based upon root tip fluorescence, pubescence morphology, and isozyme patterns at ten enzyme systems. We also evaluated levels of genetic diversity of the central Chinese accessions (n=107) by comparing previously studied ancestors and milestone cultivars (NAC, n=64) in the USA. Finally, we estimated the degree of genetic differentiation among six Chinese provinces (Anhui, Gansu, Henan, Jiangsu, Shaanxi, and Shanxi). There was significant difference between pre-selected and random accessions in terms of the mean number of alleles per locus (A, 2.44 vs. 2.13) and allelic richness (2.26 vs. 2.10). However, the former (H□=0.393) maintained levels of gene diversity or expected heterozygosity (H□) similar to the latter (H□=0.394). This is attributed to the fact that many alleles found in pre-selected accessions were present at very low frequencies (mean effective number of alleles, A□=1.72). A broader range of alleles detected in the pre-selected accessions suggests that pre-selection of accessions screened from isozyme data may be useful for selecting germplasm collections with a greater number of RFLP alleles. The central Chinese accessions maintained a significantly higher level of RFLP genetic diversity than the NAC (H□=0.405, A=2.50 for central China vs. H□=0.339, A=2.08 for the USA). We detected significant genetic differentiation among the six provinces (mean G□=0.133). These results suggest that Chinese germplasm accessions from various regions or provinces in the USDA germplasm collection could be used to enhance the genetic diversity of US. cultivars. |
本系統中英文摘要資訊取自各篇刊載內容。