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Title: Studies on improvement of chillies for resistance to Anthracnose and Cercospora leaf spot diseases
Authors: Devinder Singh Cheema
Guide/Chairperson: D P, Singh
Keywords: improvement
leaf spot diseases
Issue Date: 1982
Year of Submission: 1982
Abstract: Studies to locate sources of resistance to Anthracnose and Cercospora leaf spot diseases the inheritance of their resistance and to confirm the role of phenols in imparting resistance to these disease were carried out. Based on three years screening of 111 genotypes against Anthracnose disease and 123 genotypes against Cercospora leaf spot diseases, sources of resistance were located in 35 and 45 lines respectively. Inheritance of anthracnose resistance studied using five crosses involving three resistance and two susceptible parents. Five crosses involving two resistance and two susceptible parents were used for study of inheritance of resistance to Cercospora leaf spot. Two separate trials were laid out in kharif 1981 the six generations namely, P1, P2, F1, F2, B1 and B2 of the five crosses in each disease were planted in randomized block design with two replications each. The individual plants were visually scored for disease severity. Based on the number of spots per leaf, grading scales of 0-5 and 0-2 were used in anthracnose and Cercospora leaf spot diseases. The data in respect of Cercospora leaf spot indicated that inheritance of resistance governed by three complimentary genes. The quantitative analysis indicated that both the types of gene actions, i.e., additive (d) and dominance (h) were important. For resistance to Anthracnose, it is advocated to go for bi-parental crosses to exploit both types of gene actions involved. For Cercospora leaf spot resistance, it is advocated to resort to repeated backcrossing using the resistant parents. For simultaneous incorporation of resistance to both diseases, it is advocated to adopt recurrent selection. The role of total phenols could not be related with the resistance to both the diseases. 46
URI: http://www.erepo.iihr.ernet.in/handle/123456789/338
University in which they received their degree: University of Agricultural Sciences, Bangalore
Degree Level: Ph.D

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