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Title

RESEARCH ON THE EFFECTS OF WATER STRESS ON ANATOMICAL STRUCTURE OF SUNFLOWER (HELIANTHUS ANNUUS L.)

Pages

 Start Page 11 | End Page 24

Abstract

 In order to study the effects of drought stress on anatomical characteristics in four SUNFLOWER cultivars (Azargol, Euroflor, Alstar, Ketil) two separate experiments were carried out. The first experiment was conducted at optimum irrigation whereas the second experiment was considered as drought stress condition.Considering the results of cytohistology in control plants and plants under severe stress showed that drought stress caused decrease in epidermal parenchyma, vascular diameter, length of scelerenchyma cap on phloem and increase numbers of vascular rows and vascular elements in stems. In the leaves of the plants under drought stress, the thickness of lamina and vascular diameter were decreased. In cross sections two layers of palisade parenchyma oa Azargol and Alestar under drought stress reduced to one layer but one layer of palisade parenchyma cells of Euroflor and ketil were denser than those in well irrigated ones. Drought stress caused a decline in vascular diameter, the number of vascular rows and the number of vascular elements. A relative acceleration of embryo development was observed in plant under drought stress except the Euroflor.

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