Induction of resistance to Colletotrichum truncatum in lima bean

Rommel Dos Santos Siqueira Gomes,Luciana Cordeiro Do Nascimento

doi:10.1590/1808-1657000022018

Rommel Dos Santos Siqueira Gomes, Luciana Cordeiro Do Nascimento

Open Access

https://doi.org/10.1590/1808-1657000022018

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Abstract

ABSTRACT: Anthracnose (Colletotrichum truncatum) is one of the major diseases of the lima bean culture, found in production fields, causing decrease in productivity. The objective of this study was to evaluate the effect of abiotic and biotic inducers applied in lima bean plants to reduce anthracnose severity. Lima bean accessions were used and treated with: the abiotic inducers calcium silicate (Agrosilício Plus) and silicate clay (Rocksil), using the 3 g dose.L-1; the biotic inducer citric biomass extract (Ecolife), at the dose of 3 mL.L-1; and distilled water as control. To evaluate the resistance induction, the results of severity and degree of resistance of fava bean at 7, 11, 15, 19 and 23 days after inoculation were considered according to the scale of grades and classes of reactions. The design was a randomized block in a factorial arrangement 4 × 15 (treatments × hits) with four blocks. Resistance inducers Agrosilicon Plus, Ecolife and Rocksil have potential to be used in the management of anthracnose in fava bean. The studied accesses showed degree of resistance, being able to be explored in relation to obtaining anthracnose resistant cultivars in future breeding programs of this crop.

Highlights

MATERIALS AND METHODSLima bean (Phaseolus lunatus L.) is the second most important legume of the genus due to its high-quality protein content, making it an excellent food option and source of revenue for small farmers (SOARES et al, 2010)
Significant differences were found among the treatments with regard to anthracnose severity (p < 0.001)
The present results are similar to the findings described by MORAES et al (2006), who studied the effect of different silicate sources

Summary

Introduction

MATERIALS AND METHODSLima bean (Phaseolus lunatus L.) is the second most important legume of the genus due to its high-quality protein content, making it an excellent food option and source of revenue for small farmers (SOARES et al, 2010). With regard to chemical control, there are no products registered for the management of anthracnose on lima bean plants. Few studies have been conducted on the use of such substances for the development of resistance to anthracnose in lima bean plants.

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