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Response of Tomato Cultigens to Meloidogyne javanica and Races of Meloidogyne incognita.

ABSTRACT: Thirty-six cultigens of tomato were evaluated for resistance against Meloidogyne javanica and four races of M. incognita with standards and parameters adopted by the International Meloidogyne Project. Most cultigens were susceptible to the nematodes, including some that were previously reported to be resistant to these nematodes. Ten accessions, namely Pusa-120, Calmart VFN, Panjab 6.NR-7, EC173898 (72T6), EC173897 (Cal-Mart), EC173896 (Kewalo), CLN363BCF-167-1-0, CLN363BCF-190-1-0, CLN363BCF-344-0-0, and CLN299BCF-4-1-4-1-1-0, were immune to all test nematodes. VFN-Bush and VFN-8 were resistant to all four races of M. incognita and immune to M. javanica. Three cultivars (Pant-T, Money Maker, and Pelican) exhibited a degree of race-specific resistance to M. incognita. Pant-T and Money Maker were hypersusceptible to race 1 and race 4 of M. incognita, respectively, but were susceptible to other races. Pelican was tolerant to M. incognita race 3 but resistant to the other races.

SUBMITTER: Khan AA

PROVIDER: S-EPMC2619216 | biostudies-literature | 1991 Oct

REPOSITORIES: biostudies-literature

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Response of Tomato Cultigens to Meloidogyne javanica and Races of Meloidogyne incognita.

Khan A A AA Khan M W MW

Journal of nematology 19911001 4S

Thirty-six cultigens of tomato were evaluated for resistance against Meloidogyne javanica and four races of M. incognita with standards and parameters adopted by the International Meloidogyne Project. Most cultigens were susceptible to the nematodes, including some that were previously reported to be resistant to these nematodes. Ten accessions, namely Pusa-120, Calmart VFN, Panjab 6.NR-7, EC173898 (72T6), EC173897 (Cal-Mart), EC173896 (Kewalo), CLN363BCF-167-1-0, CLN363BCF-190-1-0, CLN363BCF-34 ...[more]

PMID: 19283169

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Project description:Plant root exudates affect root-knot nematodes egg hatch. Chemicals in root exudates can attract nematodes to the roots or result in repellence, motility inhibition or even death. However, until recently little was known about the relationship between tomato root exudates chemicals and root-knot nematodes. In this study, root exudates were extracted from three tomato rootstocks with varying levels of nematode resistance: Baliya (highly resistant, HR), RS2 (moderately resistant, MR) and L-402 (highly susceptible, T). The effects of the root exudates on Meloidogyne incognita (M. incognita) egg hatch, survival and chemotaxis of second-stage juveniles (J2) were explored. The composition of the root exudates was analysed by gas chromatography/mass spectrometry (GC/MS) prior to and following M. incognita inoculation. Four compounds in root exudates were selected for further analysis and their allopathic effect on M. incognita were investigated. Root exudates from each tomato rootstocks (HR, MR and T strains) suppressed M. incognita egg hatch and increased J2 mortality, with the highest rate being observed in the exudates from the HR plants. Exudate from HR variety also repelled M. incognita J2 while that of the susceptible plant, T, was demonstrated to be attractive. The relative amount of esters and phenol compounds in root exudates from HR and MR tomato rootstocks increased notably after inoculation. Four compounds, 2,6-Di-tert-butyl-p-cresol, L-ascorbyl 2,6-dipalmitate, dibutyl phthalate and dimethyl phthalate increased significantly after inoculation. The egg hatch of M. incognita was suppressed by each of the compound. L-ascorbyl 2,6-dipalmitate showed the most notable effect in a concentration-dependent manner. All four compounds were associated with increased J2 mortality. The greatest effect was observed with dimethyl phthalate at 2 mmol·L-1. Dibutyl phthalate was the only compound observed to repel M. incognita J2 with no effect being detected in the other compounds. Each of the four compounds were correlated with a reduction in disease index in the susceptible cultivar, T, and tomato seedlings irrigated with L-ascorbyl 2,6-dipalmitate at 2 mmol·L-1 showed the best resistance to M. incognita. Taken together, this study provided a valuable contribution to understanding the underlying mechanism of nematode resistance in tomato cultivars.

Dataset Information

Response of Tomato Cultigens to Meloidogyne javanica and Races of Meloidogyne incognita.

Publications

Response of Tomato Cultigens to Meloidogyne javanica and Races of Meloidogyne incognita.

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