The Effects Of Chronic High Wind On Leaf Anatomy Of Zygophyllum Xanthoxylon And Salsola Arbuscula

Zygophyllum xanthoxylon (Bge)Maxin. and Salsola arbuscula Pall. are dominantshrub of the vegetation in Dabancheng with chronic high wind, in Urumqi,Xinjiang,China. They have strong drought and salt tolerant characteristic and alsoplay importan roles in maintain stability of desert ecosystem. leaves are the primaryorgans of plant water loss and photosynthesis, and the environment effects of themdirectly.The response of different condition also different,leaf anatomicalcharacteristic is show relations between ecological factor and plant response directly.Studies of leaf anatomical characteristic under adverse condition should related toplant response to environmental condition and establish up foundation for plantphysiological responses. In this paper, were studied manipulatively by pot experiment,field experimental sites were selected to provide wind-expose site and wind protectsite, in the Botanical Garden designed different wind speed and in naturalenvironment combine with analyzed leaf anatomical structures of this two species andecological adaptive strategies in the Chronic high wind environment were analyzed.The main results are as follows:(1) In the natural wind Zygophyllum xanthoxylon,compared with wind protected,thickened leaf thickness,cuticle thickness palisade tissue thickness and Water-storagecell thickness of96%、57%、122%及88%,not containing Crystal idioblast; naturalwind increased Salsola arbuscula leaf thickness,cuticle thickness palisade tissuethickness, Water-storage cell thickness,vein thickness and Crystal idioblastthickness,of40%、60%、54%、42%、48%and53%. under the strong wind,Zygophyllum xanthoxylon and Salsola arbuscula showed different anatomicalcharacteristics, on the one hand reduce mechanical damage by respecting increasedleaf thickness and vein thickness, on the other hand increased cuticle thickness,palisade tissue,Water-storage cell thickness and Crystal idioblast thickness, alsocontrol water loss.(2)In the high wind, compared with control group(mean wind speed0.3m/s),thickened of leaf thickness48%; high wind, medium wind and light windincreased the cuticle thickness of213%,117%and45%. Wind stress increased thepalisade tissue thickness of110%,70%and47%. Vein thickness thickened of109%and76%during high wind and medium wind treatment. In conclusion, under thechronic high wind simulation, Zygophyllum xanthoxylon reduce mechanical damageby increased leaf thickness, cuticle thickness, palisade tissue and vein thickness, also control water loss.(3)Both Zygophyllum xanthoxylon and Salsola arbuscula showed differentanatomical characteristics,in the Chronic high wind environment, development of leafthickness,cuticle thickness, palisade tissue thickness, Water-storage cell thickness. Inaddition Salsola arbuscula crystal idioblast and bundle sheath cells were thickened.These anatomical changes increased leaf flexibility, thus reducing mechanical stressand water loss. Responses to wind, on the other hand, seemed to be more associatedwith reducing environmental stress.