Screening cultivated okra, related species and their interspecific hybrid derivatives for resistance to powdery mildew (Erysiphe cichoracearum DC)
Department of Horticulture, Mahatma Phule Krishi Vidyapeeth, Rahuri, College of Horticulture, Pune -411 005,Depart-ment of Plant Pathology, Mahatma Phule Krishi Vidyapeeth, Rahuri -413 722. India.
DOI: https://doi.org/10.37855/jah.2007.v09i02.32
Key words: Okra, powdery mildew resistance, inter-specific hybrids, amphidiploids
Abstract: Okra germplasm, consisting of 85 accessions, which included cultivars, related species and their inter specific hybrids was screened for two seasons, while their amphidiploids, backcrosses and F3 generations were screened for one season for powdery mildew resistance (Erysiphe cichoracearum DC) under severe field epiphytotic conditions. Only the wild species A. caillei-2 and A. moschatus-1 were found immune while two biotypes of A. tetraphyllus, A. manihot spp. manihot, A. manihot spp. tetraphyllus, A. manihot (L.) Medikus and A. angulosus were found highly resistant to powdery mildew in both seasons. A. tuberculatus-1, A. caillei-1, A. ficulneus and cultivars of A. esculentus were susceptible. Reaction of inter specific hybrids, backcrosses and amphidiploids revealed that the resistance in A. caillei-2, A. angulosus and A. manihot spp. tetraphyllus were partially dominant. Further, it was observed that in F3 generations, only the lines of A. caillei -2 inter specific hybrid derivatives (lines derived from hybrids having A. caillei-2 as one parent) were found highly resistant to powdery mildew.
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