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2. Physiological and biochemical responses to saline-alkaline stress in two halophytic grass species with different photosynthetic pathways

Creator:
Guo, C. Y., Wang, X. Z., Chen, L., Ma, L. N., and Wang, R. Z.
Format:
print, bez média, and svazek
Type:
model:article and TEXT
Subject:
trávy, photosynthesis, grasses, Čína, China, ATP content, gas exchange, membrane permeability, Na2CO3 stress, salinity, Puccinellia tenuiflora, Chloris virgata, proline, 2, and 581
Language:
Multiple languages
Description:
We examined the physiological and biochemical responses of two halophytic grasses with different photosynthetic pathways, Puccinellia tenuiflora (C3) and Chloris virgata (C4), to saline-alkaline stresses. Plants were grown at different Na2CO3 concentrations (from 0 to 200 mM). Low Na2CO3 (< 12.5 mM) enhanced seed germination and plant growth, whereas high Na2CO3 concentrations (> 100 mM) reduced seed germination by 45% in P. tenuiflora and by 30% in C. virgata. Compared to C. virgata, P. tenuiflora showed lower net photosynthesis, stomatal conductance, intercellular CO2 concentration, and water-use efficiency under the same treatment. C. virgata exhibited also relatively higher ATP content, K+ concentration, and the K+/Na+ ratio under the stress treatments implying that salt tolerance may be the main mechanism for salt resistance in this species. Our results demonstrated that the C. virgata was relatively more resistant to saline-alkaline stress than the co-occurring P. tenuiflora; both two species adapt to their native saline-alkaline habitat by different physiological mechanisms., C. Y. Guo, X. Z. Wang, L. Chen, L. N. Ma, R. Z. Wang., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public