Photosynthetic and physiological characteristics of introduced plants at the desert-oasis ecotone

Abstract

Abstract: To explore adaptability of adventitious plants to extreme arid regions, we studied the photosynthesis characteristics and water potential of three plant species (Xanthoceras sorbifolia, Ziziphus jujuba and Berberis thunbergii) in the natural conditions of the desert-oasis transitional area of the Cele oasis on the southern fringe of the Taklamakan Desert.1) The three plant species showed similar light response curves: the net photosynthetic rate (P_n) increased initially but then decreased. The light saturation point (LSP) of X. sorbifolia and B. thunbergii were significantly higher than that of Z. jujuba (P<0.01), while the P_nmax and R_d of B. thunbergii were both higher than those of X. sorbifolia and Z. jujuba. These results indicated that X. sorbifolia and B. thunbergii can use glare light efficiently for photosynthesis, and B. thunbergii has the advantages of higher photosynthetic efficiency and stronger ability to withstand stress. 2) The content of chl and MDA of X. sorbifolia were significantly higher than those of the other two species (P<0.05), but the soluble sugar contents of the three species were not significantly different (P＞0.05). The Pro content of B. thunbergii was significantly higher than that of the other two species (P<0.01). 3) The X. sorbifolia had the highest water potential in three plants (P<0.01), so B. thunbergii and Z. jujuba have stronger water uptake ability. In summary, the trend of photosynthetic parameters and physiological indicators are not in complete accord; this may be due to individual differences between the species, so in order to select the most suitable adventitious plants in the oasis-desert transitional zone, further research is needed.

CLC Number:

Q945.11

LUO Wei-cheng, ZENG Fan-jiang, LIU Bo, ZHANG Li-gang, LIU Zhen, SONG Cong, PENG Shou-lan, PENG Hui-qing. Photosynthetic and physiological characteristics of introduced plants at the desert-oasis ecotone[J]. Acta Prataculturae Sinica, 2013, 22(2): 273-280.

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