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Title: Allopathic Effects of Nerium Oleander L.on Growth and Anatomy Structure of Hordeum Vulgare (monocotyledon) and Vicia Sativa (dicotyledon) Seedlings
Authors: A.Kazemi Mojarad; A.Majd ; H.Fahimi
Aff: Islamic Azad University, Science and Research Branch, Faculty of Sciences, Department of Biology, Tehran, Iran
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Keywords: Allelopathy; Anatomy Structure; Nerium Oleander; Seedling Growth
Abstract:Allelopathy is the one of factors that determines interaction between plants. Most of plants have allelopathic potential and can stimulate or inhibite received plants. If the effect of these allelochemicals is harmful to plant growth and development, it becomes a biotic stress known as allelochemical stress, which can have an indirect or direct effect on the receiver plant. Nerium oleander is a toxic plant that has been known for its compounds of glycosides and flavonoids. The most important glycoside that found in this plant is Oleandrine. In this research, allelopathic potential of leaves and flowers of N. oleander L. in different development stages on some morphological parameters of growth and development of selected monocots (Hordeum vulgare) and dicots (Vicia sativa) were considered. Extract solutions from powder leaves and flowers of N. oleander were added to each dish of Hordeum vulgare and Vicia sativa seeds, distilled water was used as control. Treatments were including control, aqueous extract of young and elder leaves, bud and flower in two different concentrations (1 and 3 %). Then bioassays of 7 and 10 days seedlings were estimated. In this paper more impressive parameters have been considered. Cross section of root seedlings were prepared for studying anatomy structure under allelopty stress. Seedlings shoot length, tallest root length and fresh weight of H. vulgare seedlings were reduced with aqueous extracts of N. oleander. Same results were shown in V. sativa. Furthermore allelopatic effects are not same at different development stage. Older parts of most plants are more allelopathic properties. Root hairs, epidermis, cortex parenchyma, endodermis, pericycle, tissue conductors and medulla were observed in root of investigated plants on control treatments. Anatomy structure results showed that the number of vessel of bundles in barley and diameter of roots in monocot and dicot increased incomparition to the control sample.