Screening of germplasm of Abelmoschus against biotic stresses

Abstract

Okra [Abelmoschus esculentus (L.) Moench] is an important vegetable of which India is the leading producer, but its yield potential is hampered due to Bhendi Yellow Vein Mosaic Virus (BYVMV) disease and insect pests like whitefly, leafhopper, and shoot and fruit borer. The present study was done to identify the stable sources of resistance. Total 44 accessions of 6 wild Abelmoschus species and 2 check cultivars of A. esculentus (Pusa Sawani and Pusa A-4) were screened under natural field conditions at Division of Vegetable Science, ICAR-IARI, New Delhi during kharif season 2015. Both the check varieties were found susceptible to BYVMV, Jassids, whiteflies, and shoot and fruit borer. Out of 44 accessions of 6 wild Abelmoschus species, 3 accessions, viz. IC306722, IC90476-1 and IC141055 were found highly resistant to BYVMV, only two accessions, viz. IC141055 and IC140986 were resistant to Jassids and only one accession 141055 was resistant to whiteflies. While all the accessions of A. tuberculatus and more than 50% of the accessions of A. manihot var. tetraphyllus and A. moschatus were found resistant to fruit borer. However, one of the wild accession IC141055 showed multiple resistance, i.e. Jassids, whiteflies and fruit borer along with resistance to BYVMV disease indicated its possible importance as source of multiple biotic stress resistance. The mentioned promising accessions can be further screened at different hotspots for confirmation and can be exploited in future breeding programmes for okra improvement.

Trends and Perspectives for the Use of Crop Wild Relatives in Crop Breeding

“…C 1 Arkamosc (variant) 750-02 produced fruits like A. moschatus, confirming the dominance of genes from the wild parent. As A. moschatus, a perennial species, is reported to be tolerant to other multiple biotic stresses such as powdery mildew, jassids, whitefly, fruit, and shoot borer (Badiger and Yadav, 2019;Yadav et al, 2019), it can be utilized in multiple pest and disease resistance breeding . The perennation tendency and profuse-bearing habit of amphidiploids can also be exploited for selecting segregants to be used as a home garden vegetable, as a single plant in the kitchen garden can suffice the okra requirement of a family throughout the year.…”

Genetic enhancement of okra [Abelmoschus esculentus (L.) Moench] germplasm through wide hybridization

“…C 1 Arkamosc (variant) 750-02 produced fruits like A. moschatus, confirming the dominance of genes from the wild parent. As A. moschatus, a perennial species, is reported to be tolerant to other multiple biotic stresses such as powdery mildew, jassids, whitefly, fruit, and shoot borer (Badiger and Yadav, 2019;, it can be utilized in multiple pest and disease resistance breeding (Badiger et al, 2023). The perennation tendency and profuse-bearing habit of amphidiploids can also be exploited for selecting segregants to be used as a home garden vegetable, as a single plant in the kitchen garden can suffice the okra requirement of a family throughout the year.…”

“…Waalk. was reported as one of the most prominent species exploited worldwide as a source of resistance/tolerance to YVMV, jassids, and fruit borer (Gangopadhyay et al, 2016;Badiger and Yadav, 2019;Patel et al, 2021). Santhiya et al (2022) also reported the promising accessions of A. moschatus (IC141055), A. tetraphyllus (IC90476-1), and A. caillei (Sikkim), which showed very low incidence of YVMV disease and no incidence of ELCV disease under natural epiphytotic screening.…”