Mohanapure Pallavi, Chavhan Meghraj, Singh Divya, Yadav Jyoti, Somvanshi Vishal Singh, Gopala Krishnan S, Vinod K K, Bhowmick Prolay K, Bollinedi Haritha, Singh Ashok Kumar, Rao Uma, Ellur Ranjith Kumar
Division of Genetics, ICAR-Indian Agricultural Research Institute, New Delhi 110012, India.
Division of Nematology, ICAR-Indian Agricultural Research Institute, New Delhi 110012, India.
Plants (Basel). 2024 Aug 15;13(16):2271. doi: 10.3390/plants13162271.
Direct-seeded rice (DSR) is gaining popularity among farmers due to its environmentally safe and resource-efficient production system. However, managing the rice root-knot nematode (RRKN), , remains a major challenge in DSR cultivation. Developing genetic resistance is a pragmatic and effective approach compared to using hazardous pesticides. Pusa Basmati 1121 (PB1121) is the most popular Basmati rice variety, but it is highly susceptible to RRKN. In contrast, Phule Radha (PR) has shown highly resistant reaction to RRKN, as reported in our earlier study. We generated an F population from the cross of PB1121/PR and evaluated it for RRKN resistance-related traits under artificial inoculation conditions. The distribution pattern of traits in the F population indicated that resistance may be governed by a few major-effect genes and many minor-effect genes. The molecular markers reported to be associated with QTLs governing RRKN resistance traits were used to test in the current population. Although the simple linear regression identified significant associations between the markers and RRKN resistance-associated traits, these associations were spurious as the LOD score was below the threshold limit. This indicates that PR possesses novel genomic regions for resistance to RRKN as it does not possess any of the earlier reported QTLs.
直播稻因其环境安全且资源高效的生产系统而在农民中越来越受欢迎。然而，在直播稻种植中，防治水稻根结线虫仍然是一项重大挑战。与使用有害农药相比，培育遗传抗性是一种务实且有效的方法。Pusa Basmati 1121（PB1121）是最受欢迎的巴斯马蒂水稻品种，但它对水稻根结线虫高度敏感。相比之下，正如我们之前的研究所报道的，Phule Radha（PR）对水稻根结线虫表现出高度抗性反应。我们通过PB1121/PR杂交产生了一个F群体，并在人工接种条件下对其进行了水稻根结线虫抗性相关性状的评估。F群体中性状的分布模式表明，抗性可能由少数主效基因和许多微效基因控制。据报道与控制水稻根结线虫抗性性状的QTL相关的分子标记被用于在当前群体中进行检测。尽管简单线性回归确定了标记与水稻根结线虫抗性相关性状之间的显著关联，但这些关联是虚假的，因为LOD得分低于阈值。这表明PR拥有新的抗水稻根结线虫基因组区域，因为它不具有任何先前报道的QTL。
