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首页> 外文期刊>Journal of Nematology, with Annual of Applied Nematology >Inheritance of Resistance to Meloidoygne incognita in Primitive Cotton Accessions from Mexico
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Inheritance of Resistance to Meloidoygne incognita in Primitive Cotton Accessions from Mexico

机译：来自墨西哥的原始棉花种对Meloidoygne incognita的抗性遗传。

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Few sources of resistance to root-knot nematodes (Meloidogyne incognita) in upland cotton (Gossypium hirsutum) have been utilized to develop resistant cultivars, making this resistance vulnerable to virulence in the pathogen population. The objectivesof this study were to determine the inheritance of resistance in five primitive accessions of G. hirsutum (TX1174, TX1440, TX2076, TX2079, and TX2107) and to determine allelic relations with the genes for resistance in the genotypes Clevewilt-6 (CW) andWild Mexico Jack Jones (WMJJ). A half-diallel experimental design was used to create 28 populations from crosses among these seven sources of resistance and the susceptible cultivar DeltaPine 90 (DP90). Resistance to M. incognita was measured as eggs per g roots in the parents, F_1 and F_2 generations of each cross. The resistance in CW and WMJJ was inherited as recessive traits, as reported previously for CW, whereas the resistance in the TX accessions was inherited as a dominant trait. Chi square analysis of segregation of resistance in the F_2 was used to estimate the numbers of genes that conditioned resistance. Resistance in CW and WMJJ appeared to be a multigenic trait whereas the resistance in the TX accessions best fit either a one or two genemodel. The TX accessions were screened with nine SSR markers linked to resistance loci in other cotton genotypes. The TX accessions lacked the allele amplified by SSR marker CR316 and linked to resistance in CW and other resistant genotypes derived fromthis source. Four of five TX genotypes lacked the amplification products from the marker BNL1231 that is also associated with the resistant allele on Chromosome 11 in WMJJ, CW, NemX, M120 RNR and Auburn 634 RNR. However, all five TX genotypes produced the same amplification products from three SSR markers linked to the resistant allele on Chromosome 14 in M120 RNR and M240 RNR. The TX accessions have unique resistance genes that are likely to be useful in efforts to develop resistant cotton cultivars with increased durability.
机译：陆地棉（陆地棉）对根结线虫（Meloidogyne incognita）的抗性来源很少，已被用于开发抗性品种，从而使这种抗性易受病原体种群的毒力影响。这项研究的目的是确定抗性基因G.hirsutum（TX1174，TX1440，TX2076，TX2079和TX2107）的五个原始种质中的抗性遗传，并确定基因型Clevewilt-6（CW）中与抗性基因的等位基因关系。和野生墨西哥杰克·琼斯（WMJJ）。半圆角实验设计用于从这七个抗性来源和易感品种DeltaPine 90（DP90）之间的杂交中创建28个种群。衡量对隐杆线虫的抗性为在每个亲本的F_1和F_2代的亲本中每g根的卵数。如先前关于CW的报道，CW和WMJJ的抗性被遗传为隐性性状，而TX种质的抗性被遗传为显性性状。 F_2中抗性分离的卡方分析用于估计调节抗性的基因数目。 CW和WMJJ的抗药性似乎是一种多基因性状，而TX种质的抗药性最适合一个或两个基因模型。用与其他棉花基因型的抗性基因座相关的9个SSR标记筛选了TX种质。 TX序列缺少由SSR标记CR316扩增的等位基因，并与CW的抗性和由此来源衍生的其他抗性基因型相关。五个TX基因型中的四个缺乏来自标记BNL1231的扩增产物，该标记也与WMJJ，CW，NemX，M120 RNR和Auburn 634 RNR中11号染色体上的抗性等位基因相关。但是，所有五个TX基因型均从与M120 RNR和M240 RNR中14号染色体上的抗性等位基因连锁的三个SSR标记产生了相同的扩增产物。 TX品种具有独特的抗性基因，在开发具有更高耐用性的抗性棉花品种方面可能很有用。

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