Attachment of Pasteuria Penetrans Spores To the Root Knot Nematode Meloidogyne Javanica in Soil and Its Effects On Infectivity

Nematologica ◽  
1990 ◽  
Vol 36 (1-4) ◽  
pp. 246-252 ◽  
Author(s):  
J. Perry ◽  
G.R. Stirling ◽  
R.D. Sharma
Keyword(s):  
Meloidogyne Javanica ◽  
Pasteuria Penetrans ◽  
Root Knot Nematode

The isolation of a single spore isolate of Pasteuria penetrans and its pathogenicity on Meloidogyne javanica

Nematology ◽  
2004 ◽  
Vol 6 (4) ◽  
pp. 463-471 ◽  
Author(s):  
James R. Trotter ◽  
Daim Ali Darban ◽  
Simon R. Gowen ◽  
Alistair H. Bishop ◽  
Barbara Pembroke
Keyword(s):  
Dna Sequences ◽  
Meloidogyne Javanica ◽  
Egg Mass ◽  
Parental Population ◽  
Pasteuria Penetrans ◽  
Root Knot Nematode ◽  
Single Spore ◽  
Mass Line ◽  
Single Spore Isolate ◽  
Spore Population

Abstract We have obtained a single spore isolate of Pasteuria penetrans, derived by allowing a single spore to attach to a secondstage juvenile (J2) of the root-knot nematode Meloidogyne javanica. By analysing DNA sequences at three different loci we have obtained evidence that the isolate is, indeed, genetically pure. We compared the ability of the single spore isolate and the parent population from which it was selected to attach to and parasitise both the original population of M. javanica on which it was isolated and a single egg mass line derived from it. There was no difference in the attachment of spores of the single spore isolate to juveniles compared to the parental population, although there were higher numbers of both attaching to J2 of the single egg mass line compared to its parental population. Judging from the numbers of egg masses and Pasteuria -infected females, the single spore isolate was less pathogenic to the parental population of M. javanica than was the parental spore population.

scholarly journals Mineral composition of beetroot treated with potential elicitors and inoculated with Meloidogyne javanica

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Paula Juliana Grotto Débia ◽  
Beatriz Cervejeira Bolanho ◽  
Claudia Regina Dias-Arieira
Keyword(s):  
Population Density ◽  
Mineral Composition ◽  
Integrated Management ◽  
Meloidogyne Javanica ◽  
Nematode Population ◽  
Root Knot Nematode ◽  
Cu Content ◽  
Manganese Zinc ◽  
Nematode Population Density ◽  
Elicitor Treatments

Abstract Background The root-knot nematode Meloidogyne javanica can infect beetroots, causing extensive damage to this food crop. As chemical and genetic control tactics have shown limited efficacy, new strategies are needed to improve the integrated management of this parasite. This study assessed the influence of potential defence elicitors and M. javanica infection on the mineral composition of beetroot. Plants were treated with acibenzolar-S-methyl (ASM), citrus biomass, or a mannanoligosaccharide-based product (MOS) and inoculated with 1000 eggs and second-stage juveniles of M. javanica. At 60 days after inoculation, beetroot plants were harvested and evaluated for nematode population density, vegetative growth, and mineral content. Results All potential elicitors reduced nematode population density in beetroots (p ≤ 0.10) and improved the vegetative parameters of inoculated plants (p ≤ 0.05), except shoot fresh weight. Some minerals were found to be negatively affected by treatments, particularly calcium, whose levels were consistently lower in treated plants. On the other hand, M. javanica inoculation increased magnesium, iron, manganese, zinc, and copper contents in beetroots. However, the latter mineral (Cu content) of inoculated plants was positively influenced by MOS and ASM. Conclusion Potential elicitor treatments did not improve the mineral composition of beetroot, but were effective in reducing nematode population density. Plants inoculated with M. javanica had higher mineral levels. However, gall formation decreases the commercial value of the crop and might render it unsuitable for commercialisation. M. javanica-infected beetroots may be used for nutrient extraction or sold to food processing industries.

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