STUDIES ON TRANSMISSION OF LEAF CRINKLE VIRUS THROUGH SEED IN URDBEAN (Vigna mungo)

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Date
2024-05-16
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ACHARYA N G RANGA AGRICULTURAL UNIVERSITY
Abstract
The present investigation on “Studies on transmission of leaf crinkle virus through seed in urdbean [Vigna mungo (L.) Hepper]” was carried out at Regional Agricultural Research Station, Lam, Guntur district, Andhra Pradesh during rabi, 2021-22. Screening of urdbean genotypes against Urdbean Leaf Crinkle Virus (ULCV) was conducted in 25 genotypes and one check under field conditions in Randomized Block Design (RBD) with two replications. Results revealed that one genotype was found highly resistant, ten genotypes were resistant, nine genotypes were moderately resistant, three genotypes were moderately susceptible and three genotypes exhibited susceptible reaction to ULCV. While none of the urdbean genotypes were found to be highly susceptible to the disease. The seeds from ULCV disease infected plants showed variation in seed shape, colour and seed index. Seed quality parameters viz., germination percent, seedling length, seedling vigour index were reduced in the seeds collected from ULCV infected plants compared to seeds from healthy plants. Highest per cent decrease over healthy seed in germination %, seedling length, seedling vigour index of ULCV infected seed was identified in the genotype GBG 67. xvii While the electrical conductivity of seed leachates was increased in the seeds from ULCV infected plants compared to healthy plants. Highest percent increase over healthy seed in electrical conductivity of seed leachates of ULCV infected seed was identified in the cultivar GBG 67. Moisture content has non significant difference among the genotypes as well as healthy and ULCV infected seed. The contents of total soluble proteins were decreased in ULCV infected urdbean seed compared to healthy seed. The total soluble sugars and phenol contents were increased in ULCV infected seed of urdbean compared to healthy seed. Seed transmission was recorded to an extent of 30 per cent in susceptible cv. GBG 67. While other cultivars that are resistant and moderately resistant to ULCV recorded 10-25 % of seed transmission of virus respectively. Genotypes GBG 12, GBG 67 and LBG 904 were tested for their reaction to ULCV by mechanical sap incoulation following sprout seed abrasion method. Among the three genotypes tested for mechanical sap inoculation, highest disease incidence (80 %) was recorded in GBG 67 followed by GBG 12 with 47.82 % disease incidence and LBG 904 with disease incidence of 45.83 %.
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