Sandra Roberta Vaz Lira Maranhão

Eficiência e atividade enzimática elicitada por metil jasmonato e silicato de potássio em cana-de-açúcar parasitada por Meloidogyne incognita

ABSTRACT The present study had as objective to evaluate methyl jasmonateand potassium silicate effect on Meloidogyne incognita parasitism insugarcane ( Saccharum sp.) variety RB863129 and peroxidase and -1,3-glucanase activity elicited, under greenhouse. The effect of Methyljasmonate and potassium silicate did not affect shoot biomass. Methyljasmonate and potassium silicate significantly decreased eggs number Guimaraes, L.M.P., Pedrosa, E.M.R., Coelho, R.S.B., Couto, E.F., Maranhao, S.R.V.L. & Chaves, A. Efficiency and enzymatic activity elicited bymethyl jasmonate and potassium silicate on sugarcane under Meloidogyne incognita parasitism. Summa Phytopathologica, v.36, n.1, p.11-15, 2010. Keywords: root-knot nematode, Saccharum sp., peroxidase, -1,3-glucanase, resistance induction Palavras-chave adicionais: Nematoide das galhas, Saccharum sp . , peroxidase, -1,3-glucanase, inducao de resistencia RESUMO O presente estudo teve como objetivo avaliar o efeito de metiljasmonato e silicato de potassio sobre o parasitismo de

Resistance Induction for Meloidogyne incognita in Sugarcane through Mineral Organic Fertilizers

The effects of Coda Radimax (CR), Coda Humus-PK (CH) and Coda Vit (CV) on the induction of resistance for Meloidogyne incognita in sugarcane (Saccharum sp.) varieties (RB92579, RB863129, RB867515) through nematode reproduction, plant development and root anatomy analysis, emphasizing the differences of the lignin deposition, and cortex-vascular cylinder proportions were investigated. In 90 days after inoculation with eggs of M. incognita, CR reduced the number of eggs per root system in all the sugarcane varieties; CH and CV reduced eggs density in RB867515; CR increased stalk number in RB92579 and fresh weight of shoots in RB863129 and RB92579; CH increased plant height in RB92579 and fresh weight of shoots in RB92579 and RB867515, CV affected fresh weigh of shoots and roots of RB863129. All the tested compounds did not affect stalk diameter, number and dry weight of shoots. Cross-sections of roots showed no anatomical changes in the M. incognita inoculated tissues.

Soursop, a new host of Rotylenchulus reniformis

RESUMO Gravioleira, uma nova hospedeira de Rotylenchulus reniformis Este trabalho reporta o primeiro assinalamento do parasitismo de Rotylenchulus reniformis em gravioleira (Annona muricata) resultando numa condição de doença na hospedeira. A identificação específica do nematóide foi feita por micrometria de fêmeas imaturas, associada à presença de machos, de acordo com Lehman & Inserra. A síndrome foi considerada severa, afetando o desenvolvimento do hospedeiro.

Atypical Pratylenchus coffeae disease observed in the state of Rio Grande do Norte.

ABSTRACT Atypical Pratylenchus coffeae disease observed in the State ofRio Grande do Norte This paper reports the unique ocorrence of the lesionnematode Pratylenchus coffeae on sweet corn ( Zea mays ) cv. Elisain Mossoro county, state of Rio Grande do Norte. The nematodestrongly inhibited root development by forming large amout of locallesions. The disease now reported was severe inducing high fieldlosses. This is the first report on this patossystem in Brazil. Os nematoides das lesoes, representados por especiesdo genero Pratylenchus Graham, sao, de modo inconteste,serios problemas da agricultura mundial, incluindo-se, comdestaque, o nordeste brasileiro. O abacaxi [ Annona comosus (L.) Merr.], amendoim ( Arachis hypogaea L.), cana-de-acucar( Saccharum sp.), gravioleira ( Annona muricata L.), inhame( Dioscorea cayennensis Lam.) e milho ( Zea mays L.), saoexemplos de culturas com registro de alta suscetibilidade nestaregiao e as especies P. brachyurus (Godfrey) Filipjev &Stekhoven,