PRODUCTIVE POTENTIAL OF THE CHERRY TOMATO GENOTYPE GROUP BEFORE INFECTION BY Alternaria tomatophila

Hugo Cesar Rodrigues Moreira Catão,João Batista De Campos Menezes,Nilza Lima Pereira Sales,Franciele Caixeta,Cândido Alves Costa

doi:10.1590/1983-21252017v30n204rc

Abstract

ABSTRACT Early blight (caused by Alternaria tomatophila) is a major disease of tomato with no resistant cultivars. Thus, it is necessary to identify sources of resistance and productive genotypes for the development of new cultivars. Therefore, this study aimed to evaluate the productive potential of cherry tomato genotypes grown in the summer / fall, the severity of early blight on leaves and the incidence of disease in fruits. The treatments consisted of Carolina tomato genotypes, Cereja Vermelho, CH 152 and CLN1561A. The experimental design consisted of randomized blocks with six replications, and the experimental plot had 16 plants. The following characteristics were evaluated: area under the disease progress curve (AUDPC), average number of microinjuries on the fruits (MF), average number of fruits per bunch (NFC), average number of bunches per plant (NCP), average number of fruits per plant (NFP), average yield, number of fruits with incidence of early blight per plant (NFI) and the severity of early blight in leaves (%). The cherry tomato genotype CH152 showed tolerance to early blight with a smaller area under the disease progress curve, lower severity and fruits with incidence of A. tomatophila were not observed in this genotype. The CH152 had the highest number of fruits per bunch, greater number of bunches per plant, higher number of fruits per plant and higher productivity. This line has great potential of being integrated into breeding programs.

Highlights

The growing demand of the consumer market for mini tomatoes (Solanum lycopersicum var. cerasiforme), has greatly aroused the interest of farmers
Reports in the literature have indicated that the severity of the disease is influenced by climatic conditions during the cultivation of tomato plant (SALUSTIANO et al, 2006)
The etiology of the disease has been traditionally attributed to the fungus Alternaria solani Sorauer (ROTEM, 1994), in 2000 a new species was described, Alternaria tomatophila Simmons, is commonly associated with the black spot lesions on tomato plants (SIMMONS, 2000; LOURENÇO et al, 2009)

Summary

Introduction

The growing demand of the consumer market for mini tomatoes (Solanum lycopersicum var. cerasiforme), has greatly aroused the interest of farmers. Cerasiforme), has greatly aroused the interest of farmers The introduction of this new tomato group to the market, resulted in its widespread distribution. It created new demands for research on the development of cultivars with high productivity, disease resistance and adaptation to Brazilian conditions (ROCHA et al, 2009). Reports in the literature have indicated that the severity of the disease is influenced by climatic conditions during the cultivation of tomato plant (SALUSTIANO et al, 2006). The etiology of the disease has been traditionally attributed to the fungus Alternaria solani Sorauer (ROTEM, 1994), in 2000 a new species was described, Alternaria tomatophila Simmons, is commonly associated with the black spot lesions on tomato plants (SIMMONS, 2000; LOURENÇO et al, 2009). When chemical control isolation is used for disease management, the results are not always effective and long lasting (ZAMBOLIM et al, 2007)

Objectives

Methods

Conclusion