Document Detail

Sodium chloride improves photosynthesis and water status in the succulent xerophyte Zygophyllum xanthoxylum.
MedLine Citation:
PMID:  21979327     Owner:  NLM     Status:  Publisher    
Zygophyllum xanthoxylum, a C(3) woody species, is a succulent xerophyte that is well adapted to arid environments. Our previous investigations showed that Na(+) has a positive effect on the growth of Z. xanthoxylum under drought conditions, which was closely related to high Na(+) accumulation in leaves. To reveal the physiological mechanisms underlying how Na(+) accumulation improves the drought resistance of Z. xanthoxylum, 3-week-old seedlings were treated with a series of additional external NaCl concentrations (5-150 mM) in sand culture experiments. Seedlings were also subjected to water deficit (30% of field water capacity) in the presence or absence of additional NaCl (50 mM) in pot experiments. The results indicated that 50 mM NaCl could mitigate deleterious impacts of water deficit on the growth of Z. xanthoxylum, by improving the relative water content, inducing a significant drop in leaf water potential and, concomitantly, increasing leaf turgor pressure and chlorophyll concentrations resulting in an enhancement of overall plant photosynthetic activity (i.e., photosynthetic rate and water use efficiency). Furthermore, NaCl (50 mM) could alleviate the inhibitory effect of water deficit on the activity of photosystem II in Z. xanthoxylum. The contribution of Na(+) to the total osmotic potential varied from 8% in the control to 13% in plants subjected to water deficit and, surprisingly, to 28% in plants grown in the presence of 50 mM NaCl under water deficit; however, the contribution of K(+) significantly decreased from 13 to 8%. These findings suggest that, under arid environments, Z. xanthoxylum is able to accumulate a high concentration of Na(+) in its leaves and use it directly for osmotic adjustment, which was coupled with an improvement in leaf hydration and photosynthetic activity.
Qing Ma; Li-Jun Yue; Jin-Lin Zhang; Guo-Qiang Wu; Ai-Ke Bao; Suo-Min Wang
Related Documents :
16930667 - Toxicity of fenamiphos and its metabolites to the cladoceran daphnia carinata: the infl...
21775137 - Effect of soy skim from soybean aqueous processing on the performance of corn ethanol f...
15315377 - Hydrolytic products and kinetics of triazophos in buffered and alkaline solutions with ...
24218227 - Evaluation of calcium and magnesium in scalp hair samples of population consuming diffe...
24799237 - The batch adsorption of the epigallocatechin gallate onto apple pomace.
11470247 - Water-soluble and water-insoluble glucans produced by escherichia coli recombinant dext...
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-10-6
Journal Detail:
Title:  Tree physiology     Volume:  -     ISSN:  1758-4469     ISO Abbreviation:  -     Publication Date:  2011 Oct 
Date Detail:
Created Date:  2011-10-7     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100955338     Medline TA:  Tree Physiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
The State Key Laboratory of Grassland Farming Systems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 73020, P.R. China.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  [How to finance and increase the appeal of rheumatology training : View of the Association of Rheum...
Next Document:  Does action planning moderate the intention-habit interaction in the exercise domain? A three-way in...