Assessment of Okra Genotypes for Yellow Vein Mosaic Virus Tolerance

ISSN: 2319-7706 Special Issue-7 pp. 1470-1475 Journal homepage: http://www.ijcmas.com Okra (Abelmoschus esculentus L. Moench) has wide popularity in terms of cultivation and acceptability all over the world. In spite of its high nutritive value, well acceptability among end users and wide range of available genetic variability, the country is still lagging behind the leading productive countries like Ghana and Egypt in the world. One of the main okra production constraints is high incidence of most destructive yellow vein mosaic virus (YVMV) disease which infects crop at all phenological stages and can cause yield loss ranges between 50 and 94% depending on the stage of crop growth at which infection occurs. This disease is caused by a complex consisting of the monopartite begomovirus BYVMV encapsulated within a typical geminated particle and a small satellite DNA β component. However, several wild species of okra showed high degree of YVMV disease resistance. The reaction of YVMV on 20 okra genotypes including 4 checks Kashi Kranti, Kashi Satdhari, Kashi Lalima and Arka Anamika was determined using whole-plant scoring at 30, 45 and 60 days intervals. These genotypes were screened and evaluated in open field conditions in rainy season of 2015-16. Out of 20 genotypes five were showed resistant reaction to YVMV, whereas eight were moderately resistant to this disease. Remaining genotypes during whole period of experiment showed susceptible and moderately susceptible reaction. Response of these genotypes towards YVMV disease shows variability on the basis of their comparison to each other. Among the five resistant genotypes, highest resistant reaction was observed in Kashi Kranti (18.35%) followed by Kashi Satdhari (19.39%), Kashi Lalima (20.34%), Kashi Mohini (20.81%) and Punjab-8 (21.45%), respectively at 45 days after sowing. The genotypes 307-10-1 (25.45%), Pusa Makhmali (32.35%), VROB-159 (33.45%), VROB-178 (38.27%), Arka Anamika (41.93%), IBS-02 (42.36%), Pusa Sawani (43.75%) and BO-13 (44.35%) showed moderately resistant to YVMV in their increasing order of disease infection. The incidence of YVMV is higher during the months of April and May because of high temperature coupled with high rainfall. Screening of genotypes provides an idea in identification of stable source of resistance for YVMV in okra which can be utilized for development of disease resistant cultivars. K e y w o r d s YVMV, Okra, Genotypes, Infestation, Tolerance Int.J.Curr.Microbiol.App.Sci (2018) Special Issue-7: 1470-1475