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Growth and enzymatic responses of cowpea under water stress and root-knot nematode/ Crescimento e respostas enzimaticas do feijoeiro caupi sob estresse hidrico e nematoide de galhas

Considering the importance of cowpea beans in the Northeast of Brazil, the present study aimed to evaluate growing and biochemical aspects of cultivar EPACE-10 subjected to water stress and parasitism of Meloidogyne incognita under greenhouse conditions. The design was a randomized block design in a...

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Published in:Revista brasileira de engenharia agrĂ­cola e ambiental 2015-02, Vol.19 (2), p.113
Main Authors: de Sousa, Carmem C.M, Pedrosa, Elvira M.R, Rolim, Mario M, Filho, Ronaldo A. de Oliveira, de Souza, Marcela A.L.M, Filho, Joao V. Pereira
Format: Article
Language:Portuguese
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Summary:Considering the importance of cowpea beans in the Northeast of Brazil, the present study aimed to evaluate growing and biochemical aspects of cultivar EPACE-10 subjected to water stress and parasitism of Meloidogyne incognita under greenhouse conditions. The design was a randomized block design in a factorial 2 (with and without nematode) x 2 (with and without water stress), with six replications. The level of applied water stress (50% of the field capacity) reduced the nematode reproduction. However, plant growth measured by fresh and dry biomass of stems and leaves, leaf number, leaf area index, plant height and fresh root biomass was not affected by water stress applied. The responses to water stress and oxidative enzymes and parasitism of M. incognita were variable. Peroxidase was not affected; catalase was decreased by nematode parasitism, ascorbate peroxidase decreased by water stress and polyphenoloxidase decreased by water stress and parasitism ofM. incognita. Key words: Vigna unguiculata Meloidogyne incognita oxidative enzymes Considerando a importancia do feijoeiro caupi no Nordeste brasileiro, o presente estudo teve, por objetivo, avaliar o crescimento e os aspectos bioquimicos do cultivar EPACE-10 submetido a estresse hidrico e parasitismo de Meloidogyne incognita em condicoes de casa de vegetacao. O delineamento adotado foi de blocos ao acaso em esquema fatorial 2 (com e sem nematoide) x 2 (com e sem estresse hidrico), com seis repeticoes. O nivel de estresse hidrico aplicado (50% da capacidade do campo) diminuiu a reproducao do nematoide; entretanto, o desenvolvimento das plantas aferido pelas biomassas frescas e secas do caule e folhas, numero de folhas, indice de area foliar, altura da planta e pela biomassa fresca da raiz, nao foi afetado pelo estresse hidrico aplicado. As respostas das enzimas oxidativas ao estresse hidrico e parasitismo de M. incognita foram variaveis. A peroxidase nao foi afetada, a catalase foi diminuida pelo parasitismo do nematoide, a ascorbato peroxidade diminuida pelo estresse hidrico e a polifenoloxidase diminuida pelo estresse hidrico e pelo parasitismo de M. incognita. Palavras-chave: Vigna unguiculata Meloidogyne incognita enzimas oxidativas
ISSN:1415-4366
DOI:10.1590/1807-1929/agriambi.v19n2p113-118