LEAF ANATOMY AS A BIOLOGICAL MECHANISM OF COTTON RESISTANCE TO INSECT PESTS.
The article presents the results of studying the structural parameters of the leaf mesophyll of seven representatives of the genus Gossypium L. Such features as dense leaf pubescence and the presence of a thick cuticle are indicators of advancement. For resistance to aphids (Aphis gossypii Glov.) and spider mites (Tetranychus urticae), the thickness of the cotton leaf cuticle should be at least 0.85 μm. The height of the columnar parenchyma in G. hirsutum ssp. mexicanum var. microcarpum palmeri, G. hirsutum ssp. mexicanum var. nervosum, G. barbadense ssp. ruderale f. pisco is quite high, but it is possible that tolerance is affected not by the thickness of the columnar layer itself, but by the difference between the thickness of the spongy and columnar parenchyma. In this case, the height of the palisade parenchyma should exceed the height of the spongy parenchyma by 1.5 times.
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