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Influence of Some External Factors On the Rate of Oxygen Uptake By Second-Stage Juveniles of Heterodera Oryzae

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The rate of oxygen uptake of second-stage juveniles of Heterodera oryzae was measured relative to osmotic pressure, pH, oxygen tension, nutrients and temperature using the cartesian diver technique. Osmotic pressure affected the rate of oxygen uptake in relation to the nature and the concentration of the osmotic agent used. Rate of oxygen uptake was weakly affected by pH within the range 3-8. Citrate depressed the rate of oxygen uptake whereas glucose, fructose and sucrose had no effect. The effect of oxygen tension on the rate of oxygen uptake demonstrated that this species is oxygen dependent. Postanaerobic overshoot occurred after 12 h. and 24 h. of anaerobiosis. Rate of oxygen uptake increased with temperature within the range 20-36°.

Affiliations: 1: Laboratoire de Nématologie, ORSTOM. B.P. 1386 Dakar, Sénégal


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