Abstract
The yellow mosaic viruses (YMV) infecting legumes are considered to be the most devastating begomoviruses as they incite considerable yield loss. The yellow discoloration of pods and seeds of infected plants and symptom emergence in the very first trifoliate leaf of the plants in the field were suggestive that the virus may be seed borne, which was investigated in the present study. The distribution of the virus in various parts of the seeds of black gram (Vigna mungo L. Hepper) plants naturally infected in the field was determined by polymerase chain reaction (PCR), Southern blot analysis, and sequencing. Nucleotide sequencing of the PCR amplicons from the seed parts from groups of ten seeds revealed the presence of mung bean yellow mosaic virus (MYMV) in the seed coat, cotyledon, and embryonic axes. The presence of virion particles was confirmed through double antibody sandwich enzyme-linked immunosorbent assay (DAS-ELISA) and immunosorbent electron microscopy (ISEM) even in a single whole seed. In confocal microscopy, positive fluorescent signals were obtained using coat protein gene-specific primers in the embryonic axes. However, in the growth tests performed with the same batch of seeds, there was no symptom development in the seedlings though the virus (both DNA A and B components) was detected in 32 % of tested seedlings. In this study, the MYMV was detected in seed coat, cotyledon, and embryo. This study revealed that the MYMV is a seed-borne virus.
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Acknowledgments
The financial assistance by the Department of Biotechnology, Government of India (BT/PR13464/AGR/02/698/2010 dt. 01.12.2010) is duly acknowledged. We are thankful to Dr. R. Rajagopal from the Department of Zoology, North Campus Delhi University, New Delhi, for conducting the confocal microscopy study.
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Kothandaraman, S.V., Devadason, A. & Ganesan, M.V. Seed-borne nature of a begomovirus, Mung bean yellow mosaic virus in black gram. Appl Microbiol Biotechnol 100, 1925–1933 (2016). https://doi.org/10.1007/s00253-015-7188-7
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DOI: https://doi.org/10.1007/s00253-015-7188-7