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Annals of Botany 81: 273-286, 1998
© 1998 Annals of Botany Company

Water Deficit Enhanced Cotton Resistance to Spider Mite Herbivory

V. O. SADRAS+,, L. J. WILSON and D. A. LALLY

CSIRO Plant Industry, Locked Bag 59, Narrabri, New South Wales, 2390, Australia

August 26, 1997 ; September 26, 1997 . October 6,1997 .

We investigated the responses of cotton (Gossypium hirsutumL.) to the combined effects of soil water deficit and two-spotted spider mite (Tetranychus urticaeKoch) infestation. Two mite treatments (-M: uninfested, +M: artificially infested 83 d after sowing), and two water regimes (+W: well watered, -W: water stressed) were combined factorially in four treatments. Mite colonies developed at similar rates in well-watered and water-stressed crops. Despite the similar intensity of infestation, visual symptoms of mite injury were more marked in well-watered host plants (+M+W) than in their water-stressed counterparts (+M-W). Lint yield of unstressed controls (-M+W) was 175 g m-2. In uninfested crops, water deficit reduced yield by 30%, mites reduced the yield of well-watered crops by 92%, and the combination of mite infestation and water deficit reduced yield by 72% (water effect:P<0.01; mite and interaction effect:P<0.0001). Differences in yield responses to mites between well-watered and water-stressed crops were mostly related to differences in reproductive partitioning. The interaction between mites and water deficit was also significant for other crop variables including canopy temperature, leaf water potential, concentration of nitrogen in reproductive structures and seed oil concentration. The magnitude and consistency of the interaction between both stresses indicates that, under our experimental conditions, mechanisms of adjustment to water deficit may have enhanced cotton resistance to mites. This is further supported by (a) an increase in specific leaf weight and a parallel increase in leaf penetration resistance due to water deficit; (b) a negative association between macroscopic symptoms of mite injury and leaf penetration resistance; and (c) a choice test showing that adult female mites preferred to feed and oviposit on leaves from well-watered plants.Copyright 1998 Annals of Botany Company

Gossypium hirsutumL.;Tetranychus urticaeKoch; leaf water potential; leaf penetration resistance; canopy temperature; multiple stresses; specific leaf weight; radiation use efficiency; nitrogen concentration; reproductive allocation.


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A. Reddall, V. O. Sadras, L. J. Wilson, and P. C. Gregg
Physiological Responses of Cotton to Two-Spotted Spider Mite Damage
Crop Sci., May 1, 2004; 44(3): 835 - 846.
[Abstract] [Full Text] [PDF]


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