REACTION OF Crambe abyssinica TO Meloidogyne javanica AND M. incognita RACE 3

Rafael Assis de Souza,Leandro de Souza Rocha,Adelica Aparecida Xavier,Fabíola de Jesus Silva,Isac Pereira Soares Martins,Regina Cássia Ferreira Ribeiro

doi:10.1590/1983-21252019v32n128rc

Abstract

ABSTRACT Several oilseed plants have been researched for biodiesel production in Brazil, and Crambe abyssinica Hochst is one of the most promising species. The effect of the phytonematodes M. incognita race 3 and Meloidogyne javanica on C. abyssinica plants was evaluated in greenhouse experiments. A randomized block design with five nematode inoculum levels (350, 700, 1400, 2800, and 5600 eggs) and ten replications was used. C. abyssinica plants without inoculation were used as controls, and the viability of the nematodes used was tested in tomato plants inoculated with 2000 eggs. The plots consisted of pots containing one plant. The number of root knots (NG), number of egg masses (NEM), and number of eggs + second-stage juveniles (NEJ2) per root system, number of J2 per 200 cm3 of soil (NJ2), and shoot dry weight (SDW) of the inoculated C. abyssinica plants were evaluated at 45 days after inoculation. The reproduction factor (RF) of the nematodes was also evaluated. The resistance of the plants to the phytonematodes was classified using the RF criterion. Crambe abyssinica plants are susceptible to the different inoculum levels of Meloidogyne javanica and M. incognita used, and the data of all nematode variables (NG, NEM, NEJ2, NJ2, and RF) were fitted by linear models.

Highlights

Crambe abyssinica Hochst is an oilseed species of the Brassicaceae family, is indigenous to Ethiopia and was domesticated in Mediterranean regions
Javanica (MEDINA et al, 2017), the objective of this work was to evaluate the effect of different inoculum levels of M. incognita race 3 and M. javanica on C. abyssinica plants of the FMSBrilhante cultivar
The number of root knots (NRK), number of egg masses (NEM), and number of eggs + secondstage juveniles (NEJ2) per root system, number of J2 per 200 cm3 of soil (NJ2), and shoot dry weight (SDW) of the inoculated C. abyssinica plants were evaluated at 45 days after inoculation

Summary

Introduction

Crambe abyssinica Hochst is an oilseed species of the Brassicaceae family, is indigenous to Ethiopia and was domesticated in Mediterranean regions. This species is very promising for biodiesel production in Brazil because of its high seed oil content (34%) (REGINATO et al, 2013). The oil from C. abyssinica seeds is important to chemical industries because of its high content of erucic acid This oil is used in lubricants, adjuvants for pesticide applications, and as a glidant in plastic alloys (AIR, 1997). The use of this oil for biodiesel production is advantageous because it presents low melting point (-12 °C) and high oxidative stability (PITOL; BROCH; ROSCOE, 2010). C. abyssinica seed oil extraction generates a byproduct that can be used for nematode control; this byproduct contains glucosinolates, which degrade and release isothiocyanates and epiprogoitrin that present suppressive action on phytonematodes of the Meloidogyne genus (WALTER, 1996)

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Results