Cucumber and Its Related Species for Resistance to the Sourthern Root-knotNematode Meloidogyne incognita and Respond to Changes of Enzyme

ACTA HORTICULTURAE SINICA ›› 2009, Vol. 36 ›› Issue (12): 1755-1760.

• Vegetables • Previous Articles Next Articles

Cucumber and Its Related Species for Resistance to the Sourthern Root-knotNematode Meloidogyne incognita and Respond to Changes of Enzyme

YE De-you^{1, 2} ; QIAN Chun-tao¹ , J IA Yuan-yuan¹ , ZHANG Yan-xia¹ , and CHEN Jin-feng^1*

(¹ State Key Laboratory of Crop Genetics and Germ plasm Enhancement, College of Horticulture, Nanjing Agricultural University,Nanjing 210095, China; ² Institute of Vegetables, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China)

Received:2009-06-12 Revised:2009-12-07 Online:2009-12-25 Published:2009-12-25
Contact: CHEN Jin-feng

Abstract

Abstract: The eight Cucum is germplasms were selected for evaluation of their resistance to the root-knot nematodes Meloidogyne incognita. The results showed that the two Cucumis wild relatives were highly resistant to Meloidogyne incognita, and the six varieties of cucumber were all susceptible. The correlation analysis between the rates of changes of superoxide dismutase ( SOD) , peroxidase ( POD) , phenylalanine ammonialyase ( PAL) in roots before and after inoculation and disease index for Cucumis species tested was performed.The results showed that there was a significant positive correlation of SOD ( r = 0.8278*),highly significant negative correlation of POD ( r = - 0.9679** )
and significant negative correlation of PAL(R=-0.8499*) associated with the disease index, respectively. POD isoenzyme electrophoresis analysis showed that there were three more enzyme bands (Rf = 0.126, 0.188, 0.944) in the resistant genotype ‘C. hystrix’, but only one weak band (Rf = 0.396) in the suscep \tible genotype‘Beijing Jietou’when compared to noninoculated control. The level of SOD, POD and PAL activities can be used as the biochemical markers and the supplement for the conventional method of evaluation for resistance to the root-knot nematodes in Cucumis species.

Key words: cucumber, Cucumis, related species, Meloidogyne incognita, resistance, enzyme

CLC Number:

YE De-you;;QIAN Chun-tao;J IA Yuan-yuan;ZHANG Yan-xia;and CHEN Jin-feng. Cucumber and Its Related Species for Resistance to the Sourthern Root-knotNematode Meloidogyne incognita and Respond to Changes of Enzyme[J]. ACTA HORTICULTURAE SINICA, 2009, 36(12): 1755-1760.

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Cucumber and Its Related Species for Resistance to the Sourthern Root-knotNematode Meloidogyne incognita and Respond to Changes of Enzyme

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