Inheritance of resistance in chilli against root and collar rot caused by Phytophthora capsici

• Published in: Journal of plant pathology Vol. 103; no. 3; pp. 769 - 775
• Main Authors: Kumar, Manish, Reddy, Kambham Madhavi, Sriram, Subbaraman, Yadav, Rajeev Kumar
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.08.2021
• Subjects: Biomedical and Life Sciences; Life Sciences; Original Article; Plant Sciences; Disease resistance; Genetics; Chilli
• ISSN: 1125-4653; 2239-7264
• DOI: 10.1007/s42161-021-00881-7

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/ F 1 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 F 2 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/ F 1 hybrids, further.