Photosynthetica 2006, 44(3):355-364 | DOI: 10.1007/s11099-006-0036-3

Water relations, gas exchange, photochemical efficiency, and peroxidative stress of four plant species in the Heihe drainage basin of northern China

J. R. Gong1, A. F. Zhao2, Y. M. Huang1,*, X. S. Zhang1, C. L. Zhang1
1 College of Resources Science and Technology, Beijing Normal University, Beijing, China
2 Department of Biological Science and Biotechnology, Yantai Normal University, Yantai, China

Haloxylon ammodendron, Calligonum mongolicum, Elaeagnus angustifolia, and Populus hosiensis had different adaptations to limited water availability, high temperature, and high irradiance. C. mongolicum used water more efficiently than did the other species. Because of low transpiration rate (E) and low water potential, H. ammodendron had low water loss suitable for desert conditions. Water use efficiency (WUE) was high in E. angustifolia, but high E and larger leaf area made this species more suitable for mesic habitats; consequently, this species is important in tree shelterbelts. P. hosiensis had low WUE, E, and photosynthesis rates, and therefore, does not prosper in arid areas without irrigation. High irradiances caused photoinhibition of the four plants. The decrease of photochemical efficiency was a possible non-stomata factor for the midday depression of C. mongolicum. However, the species exhibited different protective mechanisms against high irradiance under drought stress. H. ammodendron and C. mongolicum possessed a more effective antioxidant defence system than E. angustifolia. These three species showed different means of coping with oxidative stress. Hence an enzymatic balance is maintained in these plants under adverse stress conditions, and the concerted action of both enzymatic and non-enzymatic reactive oxygen species scavenging mechanisms is vital to survive adverse conditions.

Additional key words: active oxygen; antioxidative ability; desert plants; drought stress; mesophytic plants; photochemical efficiency; photosynthesis; stomatal conductance; transpiration rate; water use efficiency

Received: October 20, 2005; Accepted: January 9, 2006; Published: September 1, 2006  Show citation

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Gong, J.R., Zhao, A.F., Huang, Y.M., Zhang, X.S., & Zhang, C.L. (2006). Water relations, gas exchange, photochemical efficiency, and peroxidative stress of four plant species in the Heihe drainage basin of northern China. Photosynthetica44(3), 355-364. doi: 10.1007/s11099-006-0036-3
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