Abstract
The objective of this study was to evaluate the response to exogenous application of different chemical elicitors on the stimulation of defense enzymes such as chitinase, peroxidase, phenylalanine ammonialyase (PAL) and polyphenoloxidase (PPO) in tomato and chilli plants leaves tissues. Chemical elicitors are compounds, which activate chemical defense systems in plants. Various biosynthetic pathways are activated by chemical elicitors in plants depending on the elicitors used. Two times exogenous application of 200 ppm of salicylic acid (SA), ascorbic acid (AA), jasmonic acid (JA) and H2O2 and ethanol (1 mL of 95% ethanol in 1 L distilled water) induced the four defense enzymes production in chilli and tomato plants leaves tissues and significantly reduced viral disease incidence in chilli plants compared to control. SA at 200 ppm enhanced significantly chitinase, peroxidase, PAL and PPO enzymes in leaves tissues of tomato plants. Tomato plants treated with chemical elicitors and control did not show any disease symptoms.
Highlights
Chilli (Capsicum annuum L.) is one of the important cash crops grown in Jaffna district, Sri Lanka belonging to family of Solanaceae
Chilli plants treated with chemical elicitors and distilled water and control showed viral diseases such as little leaf and leaf puckering (Figure1) but percentage infected leaves varied among treated plants and control (Figure 2)
There was a significant reduction in viral diseases development in chilli plants when they were treated with chemical elicitors such as salicylic cacid (SA), ascorbic acid (AA), jasmonic acid (JA), ethanol and H2O2 when compared to plants treated
Summary
Chilli (Capsicum annuum L.) is one of the important cash crops grown in Jaffna district, Sri Lanka belonging to family of Solanaceae. The chilli is one of the most important vegetable as well as spice crops around the world, valued for its aroma, taste, flavor and pungency [6]. Besides traditional uses, it is being used in pharmaceuticals, cosmetics and beverages [38]. Tomato (Solanum lycopersicum L.) is one of the most widely cultivated vegetable crops in the world It is an important cash crop for medium scale commercial farmers in Jaffna district of Sri Lanka. It has become a serious threat to subsistence and commercial agriculture
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