Root and collar rot caused by Phytophthora capsici Leonian is an imperil for commercial chilli (Capsicum annuum L.) production in India as it is being cultivated continuously in the same soil under canal irrigated conditions. Development of commercial varieties/ F₁ hybrids having genetic resistance to this major soil borne pathogen is environmentally safe with reduced cost of production. Among the genotypes evaluated under artificial epiphytotic conditions, IHR3575 was found highly resistant against the virulent Indian isolate PC-IIHR1 (GenBank accession No. MK256294). In the study, to determine the genetic inheritance pattern in chilli for collar and root rot resistance, chi square analyses was performed using segregating bi-parental populations of IHR3575 accession and IHR3476, a highly susceptible genotype. In the inheritance analysis, the effects of segregation in F₂ and backcross populations indicated that a major dominant gene along with a few minor genes were found to be involved in conferring complete resistance to Phytophthora root rot (PC-IIHR1 isolate). This study will help the chilli breeders in choosing appropriate breeding methodology to develop resistant commercial chilli varieties/ F₁ hybrids, further.

由Phytophthora capsici Leonian引起的根和衣领腐烂是印度商业辣椒 ( Capsicum annuum L.) 生产的危险因素，因为它在运河灌溉条件下在同一土壤中连续种植。商业品种开发/ F ₁对这种主要土壤传播病原体具有遗传抗性的杂交种是环境安全的，生产成本降低。在人工附生条件下评估的基因型中，发现 IHR3575 对有毒的印度分离株 PC-IIHR1（基因库登录号 MK256294）具有高度抗性。在该研究中，为了确定辣椒中抗项圈和根腐病的遗传模式，使用分离 IHR3575 种质和 IHR3476（一种高度易感基因型）的双亲种群进行卡方分析。在遗传分析中，F ₂和回交群体中分离的影响表明，发现一个主要的显性基因和一些次要基因参与赋予对疫霉病的完全抗性根腐病（PC-IIHR1 分离株）。这项研究将帮助辣椒育种者选择合适的育种方法，进一步开发抗性商业辣椒品种/F ₁杂交种。