Response of lettuce cultivars to Meloidogyne javanica and Meloidogyne incognita race 1 and 2

Érika Cristina Souza Da Silva Correia,Silvia Renata Siciliano Wilcken,Norberto Da Silva,Marylia Gabriella Silva Costa

doi:10.5935/1806-6690.20190012

Érika Cristina Souza Da Silva Correia, Silvia Renata Siciliano Wilcken + Show 2 more

Open Access

https://doi.org/10.5935/1806-6690.20190012

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Abstract

The aim of this study was to evaluate resistance to Meloidogyne javanica and Meloidogyne incognita race 1 and 2 in the American group of lettuce cultivars. Two days after transplanting, the plants were inoculated with 5,000 eggs and potential second-stage juveniles of the nematode under test per pot. The Rutgers tomato was used as the standard for the viability of Meloidogyne javanica and Meloidogyne incognita race 1 and 2. The variables to be evaluated were gall index, egg mass index and nematode reproduction factor, which were evaluated 60 days after inoculation. The results showed that the Ithaca, RS-1397, Raider Plus, Challenge, L-104, IP-11, Salinas 88, Calona, Desert Queen, Classic and Vanguard 75 cultivars were resistant to Meloidogyne incognita race 1, with a reproduction factor which ranged from 0.19 to 0.88, and that the Desert Queen, L-104, Salinas 88, Vanguard 75, Robinson, RS-1397, Challenge, Raider Plus, Classic, Calona, Ithaca, Lady, IP-11 and Winterset cultivars were resistant to Meloidogyne incognita race 2, with a reproduction factor of between 0.23 and 0.93. All the cultivars under evaluation were resistant to Meloidogyne javanica, with a reproduction factor of less than 1.0.

Highlights

Lettuce (Lactuca sativa L.) is the most important leafy vegetable in the world, and is mainly consumed in natura in the form of salads (SALA; COSTA, 2012)
In the search for further information concerning the response of American-type lettuce cultivars to the rootknot nematode, the aim of this study was to evaluate the resistance of twenty-two lettuce cultivars to M. javanica and M. incognita race 1 and 2
The lettuce cultivars used in this study were Lucy Brown, Robinson, Calona, Classic, Vanguard 75, Winterset, Salinas 88, Bnondaga, Ithaca, Raider Plus, Desert Queen, Sonoma, IP-11, Sundevil, Challenge, Summer Time, L-104, L-109, Tainá, Lady and RS1397, all provided by Professor Noberto da Silva of the Department of Production and Plant Breeding, School of Agronomic Sciences, Botucatu Campus - FCA/UNESP

Summary

Introduction

Lettuce (Lactuca sativa L.) is the most important leafy vegetable in the world, and is mainly consumed in natura in the form of salads (SALA; COSTA, 2012). Species of lettuce represent almost 50% of all the leafy vegetables that are marketed, and among these, American lettuce corresponds to almost 40% of the total (MORETTI; MATTOS, 2006). Consecutive cultivation of this vegetable has increased the population of parasitic nematodes, leading to considerable economic damage. The species M. incognita (Kofoid and White) Chitwood, 1949 and M. javanica (Treub) Chitwood, 1949 stand out among the nematodes that are importance to the lettuce crop (WILCKEN; GARCIA; SILVA, 2005). Lettuce plants, when attacked by nematodes show intense debility caused by the dense formation of galls in the root system, which result in restrictions on the absorption and transport of water and nutrients from the soil; the plants become chlorotic, of small size, with little leaf volume and of no value for in natura consumption (CHARCHAR; MOITA, 2005; ORNAT; SORRIBAS, 2008)

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