Aplicação de rizobactérias em explantes e plântulas de bananeira 'Prata-Anã' no controle de Meloidogyne javanica e no desenvolvimento de mudas

Abstract

Banana is one of the most important fruit economically worldwide and in Brazil. During the crop cycle several factors may contribute to reduced quality and productivity. Amongst them the phytonematodes, mainly, Meloidogyne spp, are distinguished by their large spread and difficult control. Amongst the control measures that integrate the nematodes management, the use of micropropagated plantlets stood out. However, there are reports that such plantlets are more susceptible to nematodes and fungi when transplanted. Thus, the use of antagonists in the treatment of micropropagated plantlets is one preventive way in the integrated management. Amongst those, the rhizobacteria has shown great potential for nematode control and many provide the plantlets growth. This work aimed to evaluate the root and explants treatment of Prata-Anã plantlets by means of different bacteria isolates of rhizobacteria to control M. javanica and provide plantlets development. This study was carried out at Phytopathology laboratory and Biotechnology one at Universidade Estadual Montes Claros, Janauba Campus. plantlets. Four essays were set. In the 1 essay, it was evaluated, in vitro, rhizome and root colonization by rhizobacteria,, plantlets growth and the effect of the suspension obtained from the roots on the mortality of second stage juveniles of M. javanica. In the 2 essay, the plantlets grown from explantlets treated with rhizobacteria were planted in pots containing soil and their development and control of nematodes were evaluated. In 3 essay, it was evaluated the treatment of roots of plantlets with ten isolates of rhizobacteria for two periods to control M. javanica, and in the 4 essay, it was evaluated the effect of treatment of roots of ten isolates of rhizobacteria for two periods on the plantlets growth. In the evaluation of explants treatment plantlets, four bacteria colonized the rhizome region, providing plantlets development and causing high mortality of J2 of M. javanica. In the treatment of roots of plantlets, P. lentimorbus- 17 e B. pumilus- 76were stood in the control of nematodes and promoting plantlets growth.