Root-Knot Nematodes (Meloidogyne spp.) Parasitizing Resistant Tobacco Cultivars in Southern Brazil

被引:19
|
作者
de Araujo Filho, Jeronimo Vieira [1 ]
Zamboni Machado, Andressa Cristina [2 ]
Dallagnol, Leandro Jose [3 ]
Aranha Camargo, Luis Eduardo [4 ]
机构
[1] Univ Fed Pelotas, Fac Agron Eliseu Maciel, Campus Capao Leao, BR-96010900 Pelotas, RS, Brazil
[2] Inst Agron Parana, BR-86047902 Londrina, PR, Brazil
[3] Univ Fed Pelotas, Fac Agron Eliseu Maciel, BR-13418900 Piracicaba, SP, Brazil
[4] Escola Super Agr Luis Dequeiroz, Dept Fitopatol & Nematol, BR-13418900 Piracicaba, SP, Brazil
关键词
N-SP MELOIDOGYNIDAE; GENETIC DIVERSITY; MAYAGUENSIS; IDENTIFICATION;
D O I
10.1094/PDIS-03-15-0341-RE
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Our study surveyed Meloidogyne spp. from tobacco cultivars in Brazil carrying the Rk gene, which confers resistance to Meloidogyne incognita races 1 and 3. Identification of Meloidogyne populations from 39 tobacco fields was based on the analysis of esterase phenotypes, perineal patterns, and 18S-internal transcribed spacer (ITS)1-5.8S ribosomal RNA sequences. Biometric characterization and differential host tests of isolates were determined as well. We detected M. incognita, M. javanica, M. enterolobii, M. arenaria, and M. inornata in 18 (46.2%), 16 (41%), 10 (25.6%), 2 (5.1%), and 1 (2.6%) samples, respectively. Mixtures of species were found in 25.6% of the samples. This is the first report of M. inornata parasitizing tobacco in Brazil's southern region. Two morphological and biochemically unusual populations had host ranges and 1TS1 sequences nearly identical to M. enterolobii and M. incognita, respectively. Pathogenic and biometric intraspecific variations were observed. Based on our results and considering the limited efficiency of the Rk gene, it is indispensable not only to search for resistance sources to M. incognita virulent strains but also to consider resistance to M. enterolobii, M. inornata, M. arenaria, and M. javanica in tobacco breeding programs. Changes in integrated management procedures should be considered to avoid increased crop damage in the future.
引用
收藏
页码:1222 / 1231
页数:10
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