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1. Screening melon genotypes for resistance to Meloidogyne enterolobii

Author

Trevisan Braz Leila, Luiz Martins Soares Pedro, Matos Martins Diniz Guilherme, Vinícius Marin Marcus, Henrique Costa Silva Edgard, Andrade Franco Carolina, and dos Santos Candido Willame

Subjects
0106 biological sciences, biology, Melon, Greenhouse, 04 agricultural and veterinary sciences, biology.organism_classification, 01 natural sciences, Meloidogyne enterolobii, Horticulture, Nematode, Genotype, 040103 agronomy & agriculture, 0401 agriculture, forestry, and fisheries, Plant breeding, Cultivar, General Agricultural and Biological Sciences, Cucumis, 010606 plant biology & botany
Abstract

Melon (Cucumis melo L.) is a cucurbitaceous of great appreciation worldwide. The intensive cultivation of melons has favored the increase of plant health problems in several producing regions. Among these problems, the root-knot nematode (Meloidogyne spp.) stands out. The development of genetically resistant cultivars is consolidated as an effective strategy for the management of these pathogens, it is then essential to screen cultivars and accessions for later identification of genetic sources of resistance. This study aimed to evaluates the reaction of melon genotypes to Meloidogyne enterolobii. The essay was conducted at the Sector of Vegetable Crops and Aromatic-Medicinal Plants of UNESP-FCAV Jaboticabal Campus, in greenhouse, from March to June, 2015. It was evaluated 18 melon genotypes, two commercial cultivars 'Fantasy' and 'Louis', and as susceptibility control, the tomato 'Santa Cruz Kada'. A completely randomized design was adopted, with 21 treatments and 7 repetitions. The total number of eggs and juveniles in the roots (TNEJ) and the reproduction factor (RF) were obtained in order to determine the reaction of each genotype evaluated. The accessions PI 414723, AC 29, and PI 124112 are resistant to M. enterolobii and are therefore promising for breeding programs. Key words: Cucumis melo, reproduction factor, plant breeding, root-knot nematode.

Published
2016
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2. Selection of resistant rootstocks to Meloidogyne enterolobii and M. incognita for okra (Abelmoschus esculentus L. Moench).

Author

Vinícius Marin, Marcus, Santos, Lucas S., Gaion, Lucas A., Rabelo, Hudson, Franco, Carolina A., Diniz, Guilherme M., Silva, Edgard H. C., and Braz, Leila T.

Subjects
*ROOTSTOCKS, *STOCKS (Horticulture), *ROOT development, *ROOT growth, *ROOT formation
Abstract

The okra (Abelmoschus esculentus L. Moench) is one of the most important vegetables in the world and is a popular food item in many tropical and subtropical countries. Besides its cultivation for fresh consumption, okra also has potential industrial uses. Nonetheless, pests and diseases remain the most damaging factors affecting its crop yield. Among these, root-knot nematodes are the main pests limiting okra production. This study aimed to determine the responses of plant species of the Malvaceae family to Meloidogyne incognita and M. enterolobii rootknot nematodes and to also assess the compatibility of the same with the okra commercial 'Colhe Bem IAC'. Resistance was evaluated using the reproduction factor in two commercial okra cultivars ('Colhe Bem IAC' and 'Santa Cruz 47'), five cotton (Gossypium hirsutum L.) plant genotypes (PRO 277, IAC 29-233, PR 136, IAC 24, and IAC 03-979), and vinagreira (Hibiscus sabdariffa L.) Other resistance-related traits measured were the percentage of healing, plant height, root length, rootstock stem diameter, scion stem diameter, number of leaves, total fresh weight and fresh weight of the scion, rootstock, and root parts. While the cotton and vinagreira genotypes tested were resistant to both species of nematodes, okra cultivars were not. The okra, however, showed successful adaptation to grafting, which may offer an important physical resistance against attacks by root-knot nematodes, while vinagreira showed the greatest potential for use as rootstock for protecting okra crops. [ABSTRACT FROM AUTHOR]

Published
2017
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