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Improved Techniques for Measuring the Co2 Exchange Rate of Meloidogyne Infected Bean Plants

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image of Nematologica
For more content, see Nematology.

An improved open system that measures CO2 exchange rate of up to 20 plants per day is described. The CO2 exchange rate was determined in experiments using Phaseolus vulgaris inoculated with one of four inoculum levels of Meloidogyne incognita juveniles. Measurements were taken at intervals up to 27 d after inoculation using either a destructive or a non-destructive assay. The normal pattern of photosynthetic rate was decreased in nematode-infected plants relative to the controls from 3 d after inoculation. Dark respiration rates significantly increased over controls only at 3 d after nematode inoculation. The change in photosynthetic and dark respiration pattern of beans after nematode inoculation is discussed in relation to the ontogenetic development of the host and nematode. The advantages of this improved open system in facilitating an understanding of the mechanisms by which nematodes affect CO2 exchange rate are identified.

Affiliations: 1: Centre for Pest Management, Department of Biological Sciences, Simon Fraser University, Burnaby, Vancouver, B.C. Canada. V5A 1S6


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