山杏苗木对干旱胁迫的生理响应

doi:10.16843/j.sswc.2019.04.015

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Abstract [Background] Many rominent problems,such as thin soil,destruction of arid vegetation,water and soil loss, and ecological deterioration present in the abandoned diggings. Artificial recovery of forests is a quick and effective approach to restore the ecology of such regions. The primary problem of vegetation restoration is to select suitable plant species.[Methods] Potted one-years-old seedlings of Prunus sibirica were used in this study, and drought stress was controled by natural evapotranspiration.The control group was conducted by normal water management. The experimental group was subjected to drought stress treatment. The soil water potential (Ψ_s), leaf water potential (Ψ_l) and the gas exchange parameters, such as net photosynthetic rate (P_n), transpiration rate (T_r),stomatal conductance (G_s), intercellular CO₂ concentration (C_i), atmosphere CO₂ concentration (C_a), atmosphere relative humility (R_H), air temperature (t_a), leaf temperature (t_l) and photosynthetic active radiation (P_AR) were measured. The physiological responses of P. sibirica to drought stress were analyzed, and its drought resistance mechanism was expolored.[Results] 1) The results indicated that the Ψ_s and Ψ_l of the control group and atmosphere water potential (Ψ_a) demonstrated a very small fluctuation. Furthermore, Ψ_s and Ψ_l of the experimental group were on a downward trend in the consecutive 7 days of soil drought stress. The decrease range of Ψ_l was obviously less than that of Ψ_s because leaves of P. sibirica absorbed atmospheric condensation. 2) The daily averages of T_r, P_n and C_i of P. sibirica in the control group in consecutive 4 days presented little changes. With soil drought stress condition lasting, the daily averages of T_r and P_n of P. sibirica of the experimental group in consecutive 4 days decreased significantly and its daily averages of C_i increased significantly (P<0.05), respectively. The threshold value of Ψ_s was -0.27 MPa in which, photosynthetic limitation was changed from stomatal to non-stomatal. 3) As the effect of tissue water capacitance (C) and water suction (ΔΨ_s-l) of P. sibirica in the experimental group, the diurnal fluctuation of Ψ_l lagged those of Ψ_s, when Ψ_s was above the mean value of permanent wilting point of most plants (-1.5 MPa).In addition, diurnal fluctuation of Ψ_l and Ψ_s stayed synchronously, when Ψ_s was below it.[Conclusions] P. sibirica has an adaption to drought environment with the mechanisms of absorbing atmospheric condensation, enhancing the ΔΨ_s-l, tissue releasing water, and stomatal adjustment, and can be used as suitable plant species for ecological restoration and barren mountain afforestation in diggings area.

Key words： Prunus sibirica drought stress atmospheric condensation water capacitance

Received: 02 May 2018

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S157.5

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	XIE Dongfeng
	WANG Huatian
	ZHANG Guangcan
	ZHANG Cai

Cite this article:

XIE Dongfeng,WANG Huatian,ZHANG Guangcan, et al. Physiological responses of Prunus sibirica seedlings to drought stress[J]. SSWC, 2019, 17(4): 122-129.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2019.04.015 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2019/V17/I4/122

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