Effect of exogenous application of salicylic acid on the severity of tomato leaf curl disease

Issue Date

6-2016

Abstract

Salicylic acid (SA) is a natural plant hormone involved in natural plant defense against diseases by acting as the signaling molecule for triggering systemic acquired resistance. In the absence of the plant innate natural defense, the resistance can be induced through exogenous application SA or its functional analogue. In this study, the effect of SA treatment on the severity of leaf curl disease of tomato (Solanum lycopersicon L.) was evaluated under screen house conditions in two experimental trials at the Crop Protection Cluster, University of the Philippines Los Baños from 2012 to 2013. The study sought to determine the concentration of SA applied at different time of induction which can effectively reduce the severity of the disease. Healthy seedlings of susceptible tomato variety, Apollo white were treated by spraying with 50, 250 or 500 uM SA at 5, 10 or 15 days before inoculation (dbi). At induction time of 5 dbi, leaf curl infection was lowest with treatment of 50 uM SA. Likewise, treatment with 50 uM SA regardless of induction time had consistently delayed and reduced the severity of leaf curl disease. Generally, plants treated with 50 uM SA had reduced amount of disease (AUDPC values), lower symptom severity score and lower disease index (DI) than the untreated control. The severity of the disease was also reduced with 250 and 500 uM SA treatment but the effect was more consistent with 50 uM.

Source or Periodical Title

Journal of ISSAAS

ISSN

0859-3132

Volume

22

Issue

1

Page

137-145

Document Type

Article

Frequency

semi-annually

Physical Description

illustrations; graph; table; references

Language

English

Subject

Tomatoes-- Disease and pest resistance

En – AGROVOC descriptors

TOMATOES; VARIETIES; LEAF CURLS; DISEASE RESISTANCE; SALICYLIC ACIDS; APPLICATION RATES

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