XVI International Botanical Congess
The structure of leaf organs of Alyssum L species: A. marginatum Steud., A. desertorum Stapf., A. dasycarpum Steph. for revealing of adaptive features. These species are annual plants from Kyzylkum desert. The general morpho-anatomical features of leaf organs: laminated, simple, smooth-edged, small, stellate trichomes, the dorsiventral mesophyll type in the cotyledons and isolateral-palisade - in the leaves. Parameters of palisade coeficient in leaves (53-78%) show high adaptive degree of these species to the conditions of Kyzylkum desert. Distribution of species according to strengthening degree of xero- and heliomorphic features is manifested in following order: A. dasycarpum - A. desertorum - A. marginatum. Probably this sequence is connected with origin of species: Mediterranean - in A. dasycarpum and A. desertorum, Central Asian - in A. marginatum.