Inheritance pattern of okra enation leaf curl disease among cultivated species and its relationship with biochemical par
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Ó Indian Academy of Sciences (0123456789().,-volV) (0123456789().,-volV)
RESEARCH ARTICLE
Inheritance pattern of okra enation leaf curl disease among cultivated species and its relationship with biochemical parameters YOGENDRA YADAV1, PRAVEEN KUMAR MAURYA1, TRIDIP BHATTACHARJEE1, SWADESH BANERJEE1, SUBRATA DUTTA2, ASIT KUMAR MANDAL2, ARUP CHATTOPADHYAY1* and PRANAB HAZRA1 1Faculty
of Horticulture, Department of Vegetable Science, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur 741 252, India 2Faculty of Agriculture, Department of Plant Pathology, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur 741 252, India *For correspondence. E-mail: [email protected]. Received 13 May 2020; revised 25 July 2020; accepted 3 August 2020 Abstract. Okra production in eastern India at present is severely threatened by whitefly-mediated okra enation leaf curl disease (OELCuD). Identification of resistant genotype and understanding the genetic control and biochemical relationship of OELCuD resistance are prerequisite for developing an effective breeding strategy. This study was conducted employing six populations (P1, P2, F1, F2, BC1 and BC2) of two selected (resistant 9 susceptible (R9S)) crosses. Associationship between severity of OELCuD and biochemical parameters of parents and hybrids at preflowering and flowering stages was studied. Segregation pattern of the genotypes in F2 generation showing OELCuD reaction of two crosses suggested that two duplicate recessive genes was operative for resistance to OELCuD. Generation mean analysis revealed involvement of both additive and nonadditive effects in the inheritance of disease resistance. Hence, postponement of selection in later generations or intermating among the selected segregates followed by one or two generations of selfing to break the undesirable linkage and allow the accumulation of favourable alleles could be suggested for the development of stable resistant genotype against this disease. Higher peroxidase activity and total phenol content in leaf emerged as reliable biochemical markers for early selection of genotype resistant to OELCuD. Keywords.
biochemical parameters; okra enation leaf curl disease; genetics; okra.
Introduction India is the largest producer of okra (Abelmoschus esculentus L. Moench) in the world (Anonymous 2017). The most important constraint in okra production is susceptibility of the crop to various insect pests (Acharya et al. 2018) and viral diseases (Das et al. 2013; Seth et al. 2017). The gangetic plains of eastern India share a coveted position in okra production. Over the years, this particular region serves as one of the hot spots of okra yellow vein mosaic disease (OYVMD) which occurs at all growth stages in okra (Das et al. 2013). At present, okra enation leaf curl disease (OELCuD) is an emerging viral disease of Indian subcontinent as a whole and in eastern parts of India in particular (Yadav et al. 2018; Jamir et al. 2020). It was first reported in Karnataka, India (Singh and Dutta 1986; Singh 1996). Later, report on incidence of th
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