ISSN 2375-1231
African Journal of Crop Science ISSN: 2375-1231 Vol. 12 (8), pp. 001-012, August, 2024. Available online at https://internationalscholarsjournals.org/journal/ajcr/table-of-contents © International Scholars Journals
Full Length Research Paper
Comparative Analysis of Pepper Cultivar Resistance and Inducer Treatments for Mitigating Gray Mould (Botrytis cinerea) in Capsicum annuum L.
A. Kamara1, E. El-Argawy2*, A. El. Korany2 and G. Amer2
1Plant Pathology Department, Faculty of Agriculture, Alexandria University, Egypt.
2Plant Pathology Department, Faculty of Agriculture, Damanhour University, Egypt.
Received 23 October 2023, Accepted 22 April, 2024
Abstract
Four different highly economic value pepper cultivars Trezaa, Emberu, Mazurka and Taranto usually grown in Egypt were used to evaluate the efficacy of certain resistance inducers to enhance resistance of pepper fruits against gray mould fungus. Pathogenicity tests with Botrytis cinerea (BC-3 isolate) revealed that cv. Mazurka (Red Colour) was most tolerant and exhibited 40.15% rot severity, while cv. Emberu (Yellow Colour) was highly susceptible and showed 79.12% rot severity. The other two pepper cultivars, that is, cv. Trezaa and Taranto showed severity of 50.23 and 52.75%, respectively. Treatment of pepper fruits with resistance inducers salicylic acid (SA); abscisic acid, methyl jasmonate and calcium chloride significantly decreased gray mould development under laboratory conditions. Calcium chloride was the most effective on all pepper cvs. mentioned earlier and inhibited diameter of rotting area with overmean of 40.6%. This was followed by SA as 34.01%. Abscisic acid and methyl jasmonate, however, showed lower mean inhibition of 16.8 and 18.8%, respectively. Meantime, treatment of pepper fruits with such resistance inducers and calcium chloride increased activity of the defense related enzymes, that is, polyphenol oxidase (PPO), peroxidase (POD), phenylalanine ammonia lyase (PAL) as well as the total phenols where SA and calcium chloride were the most effective. This could explain potentiality of such compounds to enhance pepper resistance to control B. cinerea of the gray mould of pepper.
Key words: Pepper, gray mould, Botrytis cinerea, resistance inducers, calcium chloride, defence enzymes, phenolic content.