ANALYSIS OF RESISTANCE TO YELLOW MOSAIC VIRUS IN GREEN GRAM (Vigna radiata (L.) Wilczek)
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Greengram (Vigna radiata (L.) R. Wilczek var.Â radiata), also known as Mung bean or moong, is anÂ important legume crop in Asia, Africa and latin America.Â Green gram protein is easily digested, comparativelyÂ rich in lysine, an amino acid that is deficient in cerealÂ grains.Green gram is a self- pollinated diploid grainÂ legume (2n=2x=22) crop with a small genome size ofÂ 579 Mb/1C (Arumuganathan et al., 1991). This cropÂ plays an important role in crop rotation due to its abilityÂ to fix biological nitrogen and improving soil fertility. InÂ India, MYMV (Mungbean yellow mosaic virus) wasÂ found to affect greengram in all the major growingÂ regions.The disease is transmitted by whitefly (BemisiaÂ tabaci) persistently and can infect green gram at all
growth stages. White fly adapts easily to new hostÂ plants in any geographical region, as a result it hasÂ now been reported from all the continents exceptÂ Antarctica (Rishi, 2004).It is polyphagus and wasÂ found on more than 600 plant species transmitting more than 60 plant viruses (Oliveira et al., 2001). MYMVÂ produces typical yellow mosaic symptoms. The
symptoms are in the form of small irregular yellowÂ specks and spots along the veins, which enlarge untilÂ leaves become completely yellow.