Morphology and morphogenesis studies on three Iranian native Arabidopsis species

Morphological characteristics of Arabidopsis thaliana, A. pumila and A. wallichii wereevaluated in Iran. Shape of the trichomes, shape of the basal and cualine leaves length and shape of the fruits, presence or absence of trichome in fruits flowers, color of the petals and shape of silique in cross section are the differentiating characteristics of the three species.Anatomical features of stems and leaves of the species were observed and analyzed by light microscope. Shape of the stem in transverse sectios thickness of derm presence ofcollanchyme and scloranchyme around vascular bundle the number of vascular bundle andwavy shape of the stele are the distinctive features in stems. The anatomical features of the leaves such as shape of leaves in cross section The number of palisade tissue layers, uniformity or non-uniformity of mesophyll tissue were distinctively different in the three species. Floral meristem of the two species were observed by light microscope. No difference was observed in tissue structure.