Inheritance of yellow vein mosaic disease resistance in okra [Abelmoschus esculentus (L.) Moench]
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Date
2018
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Punjab Agricultural University, Ludhiana
Abstract
Okra is an important vegetable crop grown in tropical and subtropical regions of the world. The total production of okra is drastically reduced due to various biotic and abiotic stresses. Among the biotic stresses, viral disease is of major concern. In this context, the present investigation was conducted to understand the inheritance of YVMV disease resistance using segregating populations of A. esculentus cv. Punjab Padmini × A. moschatus and A. esculentus cv. Punjab Padmini × A. tuberculatus. Cytological studies of three species of okra namely A. esculentus cv. Punjab Padmini, A. moschatus, A. tuberculatus and their inter-specific F1 hybrids were also carried out. The results of crossability studies revealed that the wild species A. moschatus and A. tuberculatus are compatible with cultivated specie A. esculentus cv. Punjab Padmini. The results showed that the resistance to YVMV was governed by single dominant gene in A. esculentus cv. Punjab Padmini × A. moschatus cross and by single recessive gene involving donor wild specie A. tuberculatus. Most of the quantitative characters studied in F1 were intermediate between their parents except petiole length and flower diameter in cross A. esculentus cv. Punjab Padmini × A. moschatus, while the number of epicalyx segments, leaf blade length, leaf blade width, petiole length and stem diameter in cross A. esculentus cv. Punjab Padmini × A. tuberculatus. In the interspecific F1 hybrid involving Punjab Padmini as female parent and A. moschatus as male parent, some of the traits like plant growth habit, stem pubescence, depth of leaf lobing, vein colour, fruit colour and shape of apex of fruit resembles to female parent while the traits like serrations of leaf margin, flower petal base colour, fruit surface between ridges, fruit pubescence and constriction of basal part of fruit resembles to male parent. In the interspecific F1 hybrid involving Punjab Padmini as female parent and A. tuberculatus as male parent, traits like plant growth habit, flower petal colour, flower petal base colour, fruit colour and fruit apex shape resembles to female parent while the traits like shape of epicalyx, stem colour, stem pubescence, leaf lobing depth, vein colour, petiole colour and constriction of fruit at basal part resembles to male parent. The chromosome number in A. esculentus cv. Punjab Padmini, A. moschatus and their interspecific hybrid is 130, 110 and 120 respectively. The chromosome number in A. esculentus cv. Punjab Padmini, A. tuberculatus and their interspecific hybrid is 130, 136 and 133 respectively. Hence, it may be concluded that both the donors A. moschatus and A.tuberculatus can be used as source of resistance against YVMV to develop resistant varieties and hybrids. The investigation revealed that both dominant and recessive gene action for resistance against YVMV found in A. moschatus and A.tuberculatus, thus further selection in advance generations will be helpful in recovering YVMV resistance in cultivated plant types.
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