Shade role in facilitation drought stress symptoms on physiology of mount Atlas mastic (Pistacia atlantica Desf.) seedlings

Document Type : Research article

Authors

1 Ph.D. Student Slilviculture and Forest Ecology, Faculty of Forest Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

2 Associate Prof., Department of Silviculture and Forest Ecology, Faculty of Forest Sciences, Grogan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

3 Prof., Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran

4 Assistant Prof., Research Division of Soil and Water, Golestan Agricultural and Natural Resources Research and Education Center, AREEO, Gorgan, Iran

5 Associate Prof., Department of Biotechnology Engineering, Faculty of New Technologies and Energy Engineering, Shahid Beheshti University, Tehran, Iran

Abstract

This investigation was carried out in Albroz research station complex (Karaj, Iran) during 2014 summer. Mount Atlas mustic (Pistacia atlantica Desf.) seedlings were treated by drought (moderate, sever and without drought stress) and shading (low, moderate and without shade) factors in a split plot experiment based on a randomized complete block design. After one month, physiological characteristics of leaves including RWC, soluble sugars, proline and pigments content, catalase enzyme activity and ion leakage were studied. Drought stress caused severe decrease in RWC and a, b and total chlorophyll contents. In contrast, shade by ameliorating drought stress significantly increased these parameters. Drought induced tolerance mechanisms in saplings and increased proline and carotenoid content while shade decreased these parameters significantly as well as a to b chlorophyll ratio. Interaction of drought and shade was significant for a chlorophyll and catalase activity, suggested that, drought treatments showed different responses to shade. Overall, results revealed positive effect of shade on drought induced saplings.

Keywords

References

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