Comparison In Drought Resistance Of Different Varieties Of Hippophae Rhamnoides Of Elaeagnaceae

In recent years,with the global warming,the frequency and severity of drought is increasing year by year.The future drought will bring more and more problems to agricultural production and social life.Therefore,it is very important and meaningful to study the environment of arid area and the vegetation growing in arid area,and to select the fine varieties with strong drought resistance for the vegetation restoration and desertification restoration in arid area.Hippophae rhamnoides is the main ecological and economic tree species in arid and semi-arid regions of china.Sea buckthorn trees are resistant to environment,strong resistance to drought,can grow in poor soil,and can effectively reduce soil erosion,improve soil physical and chemical properties,thus becoming the vegetation restoration in the Loess Plateau in the economic species.In order to identify the drought resistance of different seabuckthorn varieties,15 varieties of Hippophae rhamnoides were selected as experimental materials.Leaf is the main organ of the plant and the external environment for the exchange of matter and energy.The physiological indexes such as natural saturation deficit,critical saturation deficit,free water content,bound water content,and self-beam ratio were measured.Then,the drought resistance of 15 varieties of Hippophae rhamnoides was evaluated by projection pursuit method.The results showed that the drought resistance of varieties in order: Taiyang﹤Fuou﹤Zayou59hao﹤Zayou12hao﹤Zayou2hao﹤Zayou54hao﹤ Zhongezayou ﹤ Fuza1 hao ﹤ Zayou1 hao ﹤ Zayou5 hao ﹤ Zayou10 hao ﹤ Zayou13 hao ﹤Zayou28hao﹤Manhanshan﹤Hongxia。Leaf is an important place for plants to carry out the exchange of photosynthesis and theoutside world.The stems are important for the upper part of the support and the rational distribution of the leaves and the transportation of nutrients and water.A plant is a place where plants absorb water and inorganic salts.The structure of the plants in arid environment changed,and the environment was adapted to the environment.Therefore,through the study of anatomical structure of leaf thickness of palisade tissue,sponge tissue thickness,palisade spongy ratio,leaf compactness;stem epidermis thickness.Cortical thickness,diameter,medullary area of pericycle cells;thickness and diameter of root index,using membership function method for evaluation of drought resistance of different cultivars of seabuckthorn,subordinate function value maximum for the Manhan mountain,the smallest for the Fu ou.So the drought resistance of the relationship is in the order: Manshan﹥Honxia﹥Zayou28hao﹥Zayou5hao ﹥ Zayou31 hao ﹥ Zayou10 hao ﹥ Fuza1 hao ﹥ Zhongezayou ﹥ Zayou1 hao ﹥Zayou12hao﹥Zayou2hao﹥Zayou54hao﹥Zayou59hao﹥Taiyang﹥Fuou.The results of scanning electron microscopy showed that 15 types of epidermis were observed in the epidermis of the epidermis of the epidermis of the 3 species.There was no significant difference between the 15 varieties.There was only one layer of epidermis on the upper epidermis of the leaves,and most of the trichomes on the upper epidermis were peltate trichomes,and there were a few star shaped,star shaped,peltate trichomes.Epidermal trichome is tapetum arranged,the outermost layer is peltate hair,inner stellate hairs and Star Shield hairs;zero stars peltate scattered in the outermost layer,the distribution of vein,mesophyll at trichomes have no significant difference.In summary,15 varieties of seabuckthorn drought resistance for the Chinese seabuckthorn varieties Hongxia,Manhanshan,drought-resistant Russian seabuckthorn varieties of the Taiyang,Fuou.The drought resistance of hybrid seabuckthorn and Sino-Mongolian hybrid seabuckthorn varieties is between Chinese seabuckthorn varieties and Russian seabuckthorn varieties.