The effect of harpin protein on plant growth parameters, leaf chlorophyll, leaf colour and percentage rotten fruit of pepper plants inoculated with Botrytis cinerea

Scientia Horticulturae (Impact Factor: 1.5). 01/2006; 109(2):107-112. DOI: 10.1016/j.scienta.2006.03.008

ABSTRACT In this study, harpin protein was applied to the peppers (Capsicum annuum L. var. cvs. ‘Demre’, ‘Yalova Charleston’ and ‘Sari Sivri’) grown under natural conditions. These plants were subjected to artificial inoculation with Botrytis cinerea, which causes fruit spoilage in peppers. Changes in vegetative growth, total chlorophyll content in leaves, leaf colour and percentage of rotten fruits were determined after treatments. The number of leaves per plant value was quite low in all cultivars and the plant height value was low only in cv. ‘Sari Sivri’ treated with B. cinerea. Values obtained from vegetative growth parameters in the plants subjected to harpin protein + B. cinerea treatment were only higher than B. cinerea treatment. Leaf chlorophyll values exhibited significant decline in the plants subjected to B. cinerea treatment in all cultivars. However, the chlorophyll content in the plants subjected to harpin protein + B. cinerea treatment was low. The colour values obtained from leaves supported the chlorophyll findings. Fruit spoilage percentages were lower in the fruits picked from the plants of harpin protein + B. cinerea treatment compared with those picked from the plants only subjected to B. cinerea treatment.

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    ABSTRACT: Verticillium wilt, caused by Verticillium dahliae Kleb., is one of the most important diseases of peppers. Harpin is a bio-activator that may be used as an alternative control against insects and fungi. Therefore, the aim of this study was to describe how harpin affected plants that had been inoculated with V. dahliae. Disease severity in harpin+V. dahliae-treated plants was lowered by a rate of 85.5% compared with V. dahliae plants. In the absence of harpin, V. dahliae caused a reduction in the number of leaves per plant and plant height. Values obtained from leaf dry weight and root dry weight parameters in the plants subjected to harpin+V. dahliae were higher than those exposed to just V. dahliae. Leaf chlorophyll values declined significantly in the plants subjected to V. dahliae, and the total chlorophyll results were supported by color values. At the end of the study, spraying pepper plants with harpin during the growth period appeared to be a promising strategy to increase plant resistance and protection against V. dahliae.
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