STRUCTURE OF THE SE ED AND LEAF OF THE C OTTON (MALVACEAE) AND THEIR CORRELATIO N WITH ECONOMICALLY VALUABLE PROPERTIES

The short review of anatomic - mo rphological researches of species of Gossypium L is provided in this article. Also there are the results of studying the structure of heterochronous ovules and aril of a mature seed, also of leaf of a perspective species "Genofond - 2" and its wild parental forms Gossypium thurberi Tod and Gossypium rai- mondii Ulbr., and a species Tashkent - 1, including for comparison Gossypium arboreum subsp. obtusifolium, Gossypi- um arboreum subsp. nanking. The purpose of our research is determination of structural signs which are connected with economically valuable properties. As a result of long studying it was revealed that the perspective grade "Genofond - 2" has certain similarities, both in structure of a mature seed, and in structure of a leaf with the donors. The grade " Genofond - 2" has a firm aril and during ginning (clearing of fiber from aril) fiber remains clean. The structure of the leaf of "Genofond - 2" has only one indicator of resistance to aphis – it is scarfskin thickness. Representatives of Gossypium arboreum sub sp. obtusifolium, Gossypium arboreum subsp. nanking are resistant to aphis because the leaf has an additional layer of a palisade parenchyma and a low spongy layer.