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首页> 外文期刊>New Zealand journal of agricultural research >Progress in recurrent selection and in crossing cultivars with white clover resistant to the clover root‐knot nematode Meloidogyne trifoliophila
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Progress in recurrent selection and in crossing cultivars with white clover resistant to the clover root‐knot nematode Meloidogyne trifoliophila

机译：复发选择的进展以及白三叶草对三叶草根结线虫细胞葡萄球菌三叶草的进展

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Abstract New Zealand pastures are generally deficient in clover content due in part to root‐invading nematodes. A recurrent selection programme for resistance to the clover root‐knot nematode (Meloidogyne trifoliophila) assessed individual white clover (Trifolium repens) genotypes for the number of root galls and root dry weight. Low galling (resistant) and a few high galling (susceptible) genotypes were crossed to provide divergent selections and progeny screened. In the sixth generation, the resistant selections (n = 581) averaged 45% of the susceptible selections (n = 146) for number of galls per gram of root dry weight. The seventh generation equivalent figure improved to 38% (n = 112 resistant and n = 81 susceptible genotypes). In the seventh generation, survival of the resistant group of lines was poorer than other groups. Resistant genotypes were crossed with established cultivars and progeny screened and crossed. The resistant × cultivar progeny averaged 83% of the susceptible × cultivar progeny's...
机译：摘要新西兰牧场一般缺乏三叶草含量，部分原因是根侵入线虫。用于抵抗三叶草根结线虫（Meloidogyne Trifoliophila）的复发选择程序评估了根胆量和根系干重的单个白三叶草（三叶草）基因型。越过低磨损（抗性）和少量高gall（易感）基因型被交叉，以提供发散的选择和后代筛选。在第六代中，抗性选择的抗性选择（n = 581）平均敏感选择的45％（n = 146），用于每克根系干重的胆量。第七代等效形象改善为38％（n = 112抗性，n = 81个易感基因型）。在第七代中，抗性系列的存活率比其他群体更差。抗性基因型与已建立的品种和后代筛选和交叉交叉。抗性×栽培品种后代平均为83％的易感×栽培品种后代......

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