Screening of the hatching control of root-knot nematodes using extract concentrations from oat genotypes

AbstractSedentary cyst and root-knot nematodes withdraw large amounts of solutes from feeding structures induced in host roots. The feeding structures are specialised cells with a high metabolic activity and a tremendous capacity in translocation of nutrients. The required nutrients are provided by the plant transport systems – water and inorganic solutes from the xylem, assimilates such as sugars and amino acids from the phloem. Here we discuss the available data on the mechanisms by which nutrients are translocated into the nematode feeding sites. The interaction between Heterodera schachtii and Arabidopsis thaliana serves as a model system for cyst nematodes. In this case sufficient data are available to propose a conclusive concept for the mechanisms of nutrient flow: basically, in the early stages of nematode development syncytia are symplasmically isolated, so that transport proteins are responsible for the nutrient supply. Later, connections to the phloem via plasmodesmata are established, so that developing females are well supplied with assimilates. The interactions of root-knot nematodes with their hosts share a number of similarities but the data currently available are not sufficient to draw similar conclusions. As nutrient supply and functionality of feeding structures are the basis of biotrophic parasitism of sedentary nematodes, it is tempting to unravel the mechanisms by which both plant and nematodes influence each other via nutrient fluxes.

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Genetic tests of ancient asexuality in Root Knot Nematodes reveal recent hybrid origins

BMC Evolutionary Biology ◽

10.1186/1471-2148-8-194 ◽

2008 ◽

Vol 8 (1) ◽

pp. 194 ◽

Cited By ~ 60

Author(s):

David H Lunt

Keyword(s):

Genetic Tests ◽

Root Knot Nematodes

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BIOLOGICAL CONTROL OF ROOT KNOT NEMATODES (MELOIDOGYNE SPP.) ON TISSUE CULTURE BANANA (DWARF CAVENDISH VAR. BASARAI)

Acta Horticulturae ◽

10.17660/actahortic.2004.635.23 ◽

2004 ◽

pp. 183-186 ◽

Cited By ~ 2

Author(s):

O. Fadina Olubunmi ◽

S. Nadgauda Rajani

Keyword(s):

Biological Control ◽

Tissue Culture ◽

Root Knot Nematodes ◽

Meloidogyne Spp

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Reactions of lines of Phaseolus atropurpureus to four species of root-knot nematode

Australian Journal of Agricultural Research ◽

10.1071/ar9720623 ◽

1972 ◽

Vol 23 (4) ◽

pp. 623

Author(s):

EM Hutton ◽

WT Williams ◽

LB Beall

Keyword(s):

Lycopersicon Esculentum ◽

Differential Resistance ◽

Meloidogyne Arenaria ◽

Root Knot Nematode ◽

Root Knot Nematodes ◽

Increased Susceptibility

In each of two years the reactions of 36 lines of Phaseolus atropurpureus to the four root-knot nematodes Meloidogyne arenaria, M. hapla, M. incognita, and M. javanica were studied. Seven of the experimental lines were common to the two years. Two known susceptible species, Phaseolus lathyroides and Lycopersicon esculentum (tomato cv. Grosse Lisse), were used as controls. Four macroscopic and four microscopic reactions were recorded on each occasion, and the results analysed. Resistance to the four nematodes was present in all lines of P. atropurpureus. There was also evidence of differential resistance between lines; some showed increased resistance to all nematodes except M. hapla, and others showed both increased susceptibility to M. hapla and increased resistance to M. javanica. The severity of attack on thc controls was significantly less in the second ycar. Several explanations for this are advanced.

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