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首页> 外文期刊>Journal of Nematology, with Annual of Applied Nematology >Phenotypic Expression of rkn1-Mediated Meloidogyne incognita Resistance in Gossypium hirsutum Populations
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Phenotypic Expression of rkn1-Mediated Meloidogyne incognita Resistance in Gossypium hirsutum Populations

机译：陆地棉棉中rkn1介导的南方根结线虫抗性的表型表达

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摘要

The root-knot nematode Meloidogyne incognita is a damaging pest of cotton (Gossypium hirsutum) worldwide. A major gene (rknl) conferring resistance to M. incognita was previously identified on linkage group A03 in G. hirsutum cv. Acala NemX. To determine the patterns of segregation and phenotypic expression of rknl, F_1, F2, F_2:3, BC_1F_1 and F_2:7 recombinant inbred lines (RIL) from intraspecific crosses between Acala NemX and a closely related susceptible cultivar Acala SJ-2 were inoculated in greenhouse tests with M. incognita race 3. The resistance phenotype was determined by the extent of nematode-induced root galling and nematode egg production on roots. Suppression of root galling and egg production was highly correlated among individuals inall tests. Root galling and egg production on heterozygous plants did not differ from the susceptible parent phenotype 125 d or more after inoculation, but were slightly suppressed with shorter screening (60 d), indicating that rknl behaved as a recessive gene or an incompletely recessive gene, depending on the screening condition. In the RIL, rknl segregated in an expected 1 resistant: 1 susceptible ratio for a major resistance gene. However, within the resistant class, 21 out of 34 RIL were more resistant than the resistant parent Acala NemX, indicating transgressive segregation. These results suggest that rknl-based resistance in G. hirsutum can be enhanced in progenies of crosses with susceptible genotypes. Allelism tests and molecular genetic analysis are needed to determine the relationship of rknl to other M. incognita resistance sources in cotton.
机译：根结线虫Meloidogyne incognita是世界范围内的一种有害棉花害虫（陆地棉）。先前已在G.hirsutum cv中的连锁群A03上鉴定了赋予对隐姓氏梭菌的抗性的主要基因（rknl）。 Acala NemX。为了确定rknl的分离和表型表达模式，在Acala NemX和密切相关的易感品种Acala SJ-2之间接种种内杂交的F_1，F2，F_2：3，BC_1F_1和F_2：7重组自交系（RIL）隐孢子虫种族的温室试验。3.抗性表型由线虫诱导的根gall和根上的线虫产卵量决定。在所有测试中，根部咬伤和产卵的抑制高度相关。杂种植物的根gall和卵的产生与接种后125 d或更长的易感亲本表型没有区别，但通过较短的筛选（60 d）而受到轻微抑制，表明rknl表现为隐性基因或不完全隐性基因，取决于在筛选条件上。在RIL中，rknl以主要抗性基因的预期1抗性：1易感性比率分离。但是，在抗性类别中，34个RIL中有21个抗性比抗性亲本Acala NemX更强，表明进行了分离。这些结果表明，在具有易感基因型的杂交后代中，可增强陆地棉中基于rknl的抗性。需要进行等位性测试和分子遗传分析，以确定rknl与棉花中其他隐杆线虫抗药性来源的关系。

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