Screening of brinjal genotypes for tolerance to phomopsis blight
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Date
2017-07
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Department of Horticulture (Veg. & Flori.), BAU, Sabour
Abstract
Brinjal or eggplant (Solanum melongena L. 2n= 24) of the family solanaceae is one of the important and popular vegetable crop grown in India and other parts of the world. It has demand throughout the year but it faces diseases like phomopsis leaf the crop. Studies conducted to screen for resistant varieties of brinjal against P.vexansmet, with little success. Hence in the present study an attempt has been made to screen brinjal genotypes for resistance against phomopsis vexans. The study on variability heritability, genetic gains, correlation coefficient and path coefficients in twenty diverse brinjal genotypes was carried out for phomopsis blight, fruit yield and yield attributing traits. The study indicated that the genotypes evaluated differed significantly among all the treatment for all the seventeen traits in field condition whereas for five traits in pot experiment. The genotypes BRBL-11, followed by BRBL-4 and BRBL-1 produced significantly higher fruit yield per plant than the resistant check Pant Samrat. On the basis of percent disease index (PDI), out of twenty. The higher magnitude of coefficient of variation at phenotypic as well as genotypic leyels were observed for all genotypes in Leaf breadth, fruit length, fruit girth, average fruit weight, number of fruits per plant, fruit yield per plant, phomopsis incidence on shoot and fruit and per cent disease index. The presence of high heritability in broad sense (H2bs) along with high genetic advance in per cent of mean were observed for average fruit weight, phomopsis incidence on shoot, phomopsis incidence on fruit and per cent disease index. The phenotypic correlation coefficients between different characters were generally similar in magnitude and nature to the corresponding genotypic correlation coefficient except for few traits due to environmental influence. The significant and positive correlation with phomopsis incidence on fruit was observed at phenotypic level with phomopsis incidence on shoot, leaf breadth and days to first harvest. The analysis of path coefficient revealed appreciable amount of direct positive effect of fruit yield per plant followed by phomopsis incidence on shoot, leaf breadth, day to 50 % flowering and plant height on phomopsis incidence on fruit.
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