Seed the Source of Systemic Botrytiscinerea in Lettuce (Lactuca sativa L.)
Journal Title: Journal of Plant Science and Research - Year 2015, Vol 2, Issue 2
Abstract
Studying the epidemiology of the wide spread of necrotrophic pathogen Botrytis cinerea is of economic importance in the production and seed export of lettuce and other horticultural crops. This study showed that seed is the prime source of systemic B. cinerea in lettuce plants. The presence of the pathogen in plants grown from fungicide treated seeds suggests that the pathogen is systemic. Infection arises from both internal and external seed infection. This conclusion is based on detection of seed infection from plants which were grown in controlled conditions from infected seed collected from flower inoculated plants. Fragment analysis found that 62.5% of seed isolates detected from plants which were grown from non-fungicide treated seeds was identical to the inoculation isolate. In contrast, all seed isolates detected from plants which were grown from fungicide treated seed have different genotypes to the inoculating isolate. The results showed that with time as the plant grew, the infection from the seed spread to root, stems and leaves systemically without exhibiting symptoms. Thus seed infection spread to other parts of the plants is age dependent. This confirmed the systemic spread of the seed isolate, but showed that other B. cinerea isolates were present and that single plants can host multiple isolates. This shows that the endophytic phase is an important component of the population dynamics of B. cinerea.
Authors and Affiliations
Yahaya SM
Keywords
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