Leaf Diffusive Resistance of Sunflowers Infected by Pratylenchus penetrans

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Abstract
Diffusive resistance measurements of leaves of sunflower [Helianthus annuus] with roots infected by small populations of lesion nematodes [Pratylenchus penetrans] indicate that internal water status of otherwise symptomless plants may be lower than that of healthy plants. Younger plants showed greater diffusive resistance than did older plants; however, regardless of age, infected plants showed increased diffusive resistance in advance of healthy plants growing under similar conditions. Such moisture stress may induce the stunting commonly associated with lesion nematode infection.

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