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首页> 外文期刊>The Kasetsart Journal >Development of Semi-exotic Maize (Zea mays L.) Inbred Lines: Performance per se and in Hybrid Combinations
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Development of Semi-exotic Maize (Zea mays L.) Inbred Lines: Performance per se and in Hybrid Combinations

机译：半外来玉米（Zea mays L.）自交系的发展：本身的表现和杂种组合的表现

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摘要

To create positive transgressive segregation of quantitatively inherited traits such as yield of inbred lines, two or more sources which accumulate different classes of favorable alleles are required. Introgression of exotic germplasm into tropical inbred line is one of several possible methods. This study was conducted to asses a potential use of exotic germplasm introduced from different latitudes to improve tropical inbred lines and their performance in hybrid combinations. The results of the present study indicated that all improved exotic germplasm were equally useful as sources of desirable alleles, especially for high yield of semi-exotic inbred lines. The 25 % semi-exotic inbred lines showed earlier days to anthesis and silking, lower grain moisture content, but higher leaf disease infection than the 12.5 % semi-exotic inbred lines. Transgressive segregation of semi-exotic inbred lines was also found in each class of exotic germplasm. Testcross hybrids generated from crossing between tropical testers with 12.5 % exotic inbred lines showed higher yield, earlier maturity, and better disease resistance than the testcross hybrids of 25 % exotic inbred lines. Result of the present study suggested that combining ability of recurrent parent and the tester as well as proportion of exotic alleles in the converted semi-exotic lines are very importance for a success of semi-exotic inbred lines in hybrid combinations.
机译：为了建立数量上遗传的性状的正向海侵分离，例如自交系的产量，需要两个或更多的源，它们积累了不同类别的有利等位基因。外来种质渗入热带自交系是几种可能的方法之一。进行这项研究是为了评估从不同纬度引入的外来种质的潜在用途，以改善热带近交系及其在杂交组合中的表现。本研究的结果表明，所有改良的外来种质都可作为理想等位基因的来源，特别是对于半外来自交系的高产。与12.5％的半外来自交系相比，25％的半外来自交系显示出花期和丝化较早，籽粒含水量较低，但叶病感染率更高。在每类外来种质中也发现了半外来自交系的海侵分离。由热带测试者与12.5％的外来自交系杂交所产生的Testcross杂种比25％的外来自交系的testcross杂种具有更高的产量，更早的成熟和更好的抗病性。研究结果表明，轮回亲本和测试者的结合能力以及外来等位基因在转化后的半外来品系中的比例对于成功实现杂交组合中半外来自交系的成功非常重要。

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