Effect of seed borne pathogens on seed longevity in chickpea and cowpea under storage at 25°C to −18°C
Effect of fungal pathogen, Ascochyta rabiei on chickpea and Blackeye Cowpea Mosaic Virus (BlCMV) in cowpea was determined on seed longevity in three different seed storage regimes (25°C, 0°C and −18°C) over a period of ten years. Partitioning of variation in to various factors indicated less influence of BlCMV infection for seed conservation as compared with A. rabiei. Seed viability in chickpea decreased rapidly due to infection by A. rabiei, whereas storage at 0 or −18°C affected seed viability insignificantly in healthy seeds. Blackeye Cowpea Mosaic Virus did not affect the initial seed germination, although storage of seeds at 25°C resulted 100 percent decline in germination after 5 years in healthy as well as contaminated seeds. The results suggested that healthy seeds should be produced along with continuous seed health monitoring for storage in the gene bank for future use of genetic resources. In chickpea, infection by A. rabiei increases the rate of deterioration and hence a shorter time before regeneration is necessary in a gene bank, whereas there is little effect of BlCMV on loss of viability in cowpea. Rapid decrease after four years at high temperature suggested that chickpea should be preferably stored at low temperature to enhance the span for multiplication that will minimize the chance of loosing original variability in germplasm.
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Document Type: Research Article
Publication date: April 1, 2006
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