The studies on the morphological variability and biochemical changes induced by Mungbean Yellow Mosaic Virus (MYMV) in m
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RESEARCH ARTICLE
The studies on the morphological variability and biochemical changes induced by Mungbean Yellow Mosaic Virus (MYMV) in mungbean [Vigna radiata (L.) Wilczek] M. Mantesh1,2 · Venkatesh1,2 · N. S. Pankaja1,2 Received: 9 October 2019 / Revised: 22 March 2020 / Accepted: 1 May 2020 © Indian Phytopathological Society 2020
Abstract In the present investigation eighteen mungbean [Vigna radiata (L.) Wilczek] genotypes were screened against MYMV disease under field conditions and identified that the three genotypes as resistant, six as moderately resistant, four genotypes as moderately susceptible, three as susceptible and two as highly susceptible genotypes based on modified MULLaRP disease incidence scale (0–9). Morphological characters viz., leaf thickness and trichome density was evaluated among the genotypes having different degree of resistance. It was observed that leaves of MYMV resistant genotypes were thicker when compared to highly susceptible genotypes. Similarly, trichome density in resistant genotypes were comparatively high to that of highly susceptible genotypes. The biochemical contents viz., total phenol content, total sugar content and chlorophyll content and enzyme activity of peroxidase (PO), polyphenol oxidase (PPO) and Phenylnine ammonia lyase (PAL) enzyme activity was studied both at 30 and 60 Days after sowing (DAS). The phenol content was found higher in resistant genotypes followed by moderately resistant, moderately susceptible, susceptible and highly susceptible at 30 and 60 DAS. The similar trend was also observed in case of total phenol, chlorophyll content and peroxidase, polyphenol oxidase and Phenylnine ammonia lyase enzyme activity. Keywords Mungbean yellow mosaic virus · Vigna radiata · Biochemical parameters
Introduction Mungbean [Vigna radiata (L.) Wilczek] is one of the important pulse crops in India. a grain legume, is an important source of dietary protein across South Asia where the diet is mostly cereal based it is a short duration crop in humid and sub-humid regions (Jayappa et al. 2017). Yellow mosaic disease is caused by Mungbean Yellow Mosaic Virus (MYMV), Mungbean Yellow Mosaic India virus (MYMIV), Horsegram Yellow Mosaic Virus (HgYMV) and Dolichos Yellow Mosaic Virus (DoYMV). The Mungbean Yellow Mosaic Virus (MYMV) disease was first reported by Nariani during 1960 at IARI campus Pusa, Delhi. In South India usually
disease is caused by MYMV, a whitefly Bemisia tabaci (Genn.), transmitted Geminivirus in mungbean. Mungbean Yellow Mosaic Virus (MYMV) which is a major cause of mungbean cultivation failure in many growing countries. MYMV, is major threat to legume crops for several years. In pulses, the yield loss from viral diseases accounts for up to 80%, while in mungbean, the MYMV alone causes up to 80 to 100% loss (Bhanu et al. 2017). As the disease could not be managed satisfactorily by insecticides or any chemical application, other alternatives of controlling the disease should be designed. Therefore, the present study was conducted to integrate the m
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