The characteristics of Na+, K+ and free proline distribution in several drought-resistant plants of the Alxa Desert, China
By Suo-min Wang, C. Wan, Yanrong Wang, Hua Chen, Zhiyu Zhou, H. Fu, R. Sosebee. 2004
207 citations recorded by the source corpus.
The distribution characteristics of Na+, K+ and free proline were investigated in succulent xerophytes-Haloxylon ammodendron and Zygophyllum xanthoxylum; xerophytes-Artemisia sphaerocephala and Caragana korshinskii; and mesophytes-Agriophyllum squarrosum and Corispermum mongolicum in the Alxa Desert of China. The results showed that mesophytes and xerophytes were salt excluding species, and the concentrations of Na+ in these species were 1.5% to 3.8% of those in succulent xerophytes. Concentrations of K+ in Agriophyllum squarrosum and Corispermum mongolicum were 1.3-2.7 times those in Artemisia sphaerocephala and Caragana korshinskii. Concentrations of K+ in the stems of Agriophyllum squarrosum and Corispermum mongolicum were 1.8 and 2.2 times those in their roots, respectively, For mesophytes, accumulating large quantities of K+ in their stems may facilitate water movement along a soil-plant gradient. The xerophytes accumulated large quantities of K+ and free proline. Their proline concentrations in the whole plant were 6.0-16.0 times higher than those of mesophytes, and were 1.8-25.0 times higher than those of succulent xerophytes. In Artemisia sphaerocephala, the concentrations of proline increased by 3.1- and 10.5-fold from roots to stems, and from stems to leaves, respectively. A similar trend was observed in Caragana korshinskii. Therefore, accumulating K+ and free proline may play a role in drought adaptation in xerophytes. Succulent xerophytes Haloxylon ammodendron and Zygophyllum xanthoxylum were identified as salt diluting species that absorbed much Na+ by roots, and the Na+ was transported to the leaves and photosynthesizing branches. The succulent xerophytes accumulated larger quantities of Na+ than K+ for osmotic adjustment even at low soil salinities, resulting in the lowest values of selective absorption and selective transport capacities of the root systems. Our data suggest that Na+ accumulation rather than exclusion may be one of the most effective strategies for adaptation of succulent xerophytes to and environments. (C) 2003 Elsevier Science Ltd. All rights reserved.
Subfields: Global and Planetary Change, Plant Science
View Paper: https://www.semanticscholar.org/paper/ec85c6529dd7bb4111f23cc9da5bb74745d481b4
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Citations in the corpus
- Role of bioinoculants in development of salt-tolerance of Vicia faba plants under salinity stress (2005, result): “Wang et al. (2004) reported that proline accumulation in plants may be a symptom of stress in less salinity-tolerance species and its contribution to osmotic adjustment was apparently negligible as compared with K+. Based on these data, the authors concluded that non-Am faba plants are less…”
- Influence of water stress on morpho-physiological and phytochemical traits in Thymus daenensis (2012, result): “In agreement with our results, Wang et al. (2004) reported an increase in proline content of several plant species in water stress conditions.”
- Exogenous hydrogen sulfide alleviates salt stress in wheat seedlings by decreasing Na+ content (2015, methodology): “The values of the selective absorption (SA) capacity of the roots for K over Na were estimated according to the following equation (Wang et al. 2004):”
- Arbuscular mycorrhizal fungi in alleviation of salt stress: a review. (2009, background): “The AMF most commonly observed in saline soils are Glomus spp. (Allen and Cunningam, 1983; Ho, 1987; F. Y. Wang et al., 2004).”