盐胁迫下杨树质外体离子对气体交换参数的影响

doi:10.11707/j.1001-7488.20130706

Abstract

Abstract:

In this paper we investigated effects of apoplastic ion dynamic changes in the tender stems of Populus wutunenses and "P.simonii×P. euphratica"×P. sp. on gas exchange parameters under salt stress. The apoplastic ions were monitored by microdialysis and atomic absorption, and the gas exchange parameters were determined with a portable photosynthesis system. The net photosynthetic rates (P_n) of the two poplar cultivars all decreased with increasing salt-treated duration. The stomatal conductance (G_n) and intercellular CO₂ concentration (C_i) of P.×wutunenses increased and then decreased, whereas its stomatal limitation (L_s) exhibited a contrary changing trend. The G_n and C_i of "P. simonii×P. euphratica "× P. sp. gradually reduced, whereas its L_s increased gradually. The results indicated that the photosynthetic inhibition of P.×wutunenses under the stress of 100 mmol·L^-1 NaCl resulted from non-stomatal limitation and stomatal limitation successively, whereas that of "P. simonii×P. euphratica "× P. sp. resulted from stomatal limitation throughout the entire experiment. P_nS of the two poplar cultivars were negatively correlated with Na⁺ concentration and Na⁺/K⁺ ratio significantly, however were positively correlated with K⁺ concentration extremely significantly. A multiple linear stepwise regression analysis was performed with P_n as the dependent variable, and Na⁺, K⁺, Ca²⁺ concentrations and Na⁺/K⁺ as the independent variables. P_n was only significantly correlated with Na⁺/K⁺ aomg those independent variables. P.×wutunenses was more salt-tolerant than "P. simonii×P. euphratica "× P. sp. under salt stress. The statistical equation showed that apoplastic ion contents in the tender stems of poplar cultivars were collinearly correlated with their photosynthesis performance under salt stress.

Key words: salt stress, Populus, apoplast, ion, photosynthesis

CLC Number:

S718.43

Ma Jinlong, Jiang Guobin, Yao Shanjing, Jin Hua. Effects of Apoplastic Ion Contents in the Tender Stems of Two Populus Cultivars on Gas Exchange Parameters Under Salt Stress[J]. Scientia Silvae Sinicae, 2013, 49(7): 40-47.

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Effects of Apoplastic Ion Contents in the Tender Stems of Two Populus Cultivars on Gas Exchange Parameters Under Salt Stress

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