Abstract
Nowadays, rice is among the most preferred crops for rotation with soybean
and cotton in the large producing areas of Central Brazil. Nevertheless, the
host status of the Brazilian upland rice cultivars for Meloidogyne incognita
race 4 and Rotylenchulus reniformis has not been investigated and remains
unknown. This study dealt with the assessment of the host response of some
selected Brazilian upland rice cultivars to these nematodes under glasshouse
conditions. The host status for each tested interaction was based on the
nematode reproduction factor (RF) and number of nematodes (g root)–1. Two
experiments with M. incognita race 4, referred to as trial 1 (initial
population (IP) = 4000) and trial 2 (IP = 800), included, respectively, 14
cultivars (cvs AN Cirad 141, BRS Monarca, BRS Primavera, AN Cambará, BRS
Pepita, BRS Curinga, BRS Sertaneja, IAPAR 9, IAPAR 62, IAPAR 63, IAPAR 64,
IAPAR 117, IAC 201, IAC 202) and 19 cultivars (the same ones in Experiment 1
plus cvs BRS Maravilha, BRS Talento, BRS Bonança, Ricetec Ecco, BRS
Soberana). Except for cv. BRS Pepita, rated as resistant, the cultivars were
rated as susceptible or moderately susceptible (RF means ranged from 1.09 to
12.56). In a third experiment with R. reniformis (IP = 1800) that included
the same cultivars as in Experiment 1, all cultivars were rated as resistant
(RF means ranged from 0.01 to 0.29).
Host Status of Interspecific Upland Rice Progenies (Oryza sativa ? Oryza barthii) to Meloidogyne incognita
