Effects of salt stress on photosynthesis and ion accumulation patterns of Suaeda salsa under different habitats

doi:10.3773/j.issn.1005-264x.2010.06.006

Abstract

Abstract:

Aims Suaeda salsa can grow in the intertidal zone or on saline inland soil. The intertidal population is mainly affected by high salt concentration, hypoxia and low temperature, while the inland population is mainly affected by salt and drought. We hypothesized that S. salsa from the intertidal zone would have a greater ability to regulate salt accumulation or translocation compared with S. salsa in saline inland habitats. Therefore, our objective was to investigate the effects of salinity on growth, photosynthetic oxygen evolution and ion accumulation of two populations of S. salsa, i.e., to determine how two populations of S. salsa adapt to their different habitats.

Methods After pre-culture for 40 days, seedlings of both populations were treated with 1, 200 and 600 mmol·L^-1 NaCl. The experiment was terminated 20 days after final NaCl concentrations were reached. Then we determined the organic dry weight of shoots and roots, content of chlorophyll and the rate of photosynthetic oxygen evolution in leaves and contents of Na⁺ and Cl^- in leaves and roots of seedlings of the two S. salsa populations.

Important findings The organic dry weight of shoots and roots of both populations was not affected by 200 mmol·L^-1 NaCl, indicating that both populations had high salt resistance. Under all treatments, the rate of photosynthetic oxygen evolution was higher in leaves of S. salsa from saline inland than that in the intertidal population, while the opposite trend was true in the chlorophyll a/b ratio. The Cl^-content in leaves of S. salsa from the intertidal zone was lower than that in the saline inland habitats, while the opposite trend was true in the Cl^- content in roots, which suggests that S. salsa from the intertidal zone may employ superior control of ion accumulation (especially for Cl^-) in roots or ion translocation from roots to shoots compared with S. salsa from saline inland. These traits may affect the distribution of S. salsa in natural saline environments.

Key words: chlorophyll, ion accumulation, NaCl, photosynthetic oxygen evolution, Suaeda salsa

GAO Ben, SONG Jie, LIU Jin-Ping, SUI Na, FAN Hai, WANG Bao-Shan. Effects of salt stress on photosynthesis and ion accumulation patterns of Suaeda salsa under different habitats[J]. Chin J Plant Ecol, 2010, 34(6): 671-677.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2010.06.006

https://www.plant-ecology.com/EN/Y2010/V34/I6/671

Figures/Tables 5

Fig. 1 Effect of NaCl on organic dry weight of shoots (A) and roots (B) of Suaeda salsa under different habitats (mean ± SD). Different letters on the same column means significantly different at p < 0.05 level.

Table 1 Results of Two-way ANOVA of organic dry weight of shoots and roots, chlorophyll a and b content, chlorophyll a/b ratio, the rate of photosynthetic oxygen evolution, and Na+, Cl- content in shoots and roots of Suaeda salsa under different habitats in relation to origin of population, salinity, and origin of population × salinity interactions

性状 Traits	生境 Habitat	盐度 Salinity	生境 Habitat ×盐度 Salinity
地上部分有机干重 Organic dry weight of shoots	137.68 ***	55.40 ***	5.5 *
根系有机干重 Organic dry weight of roots	16.19 **	15.07 ***	0.25 ^NS
叶绿素a含量 Chl a content	32.67 ***	86.29 ***	6.87 **
叶绿素b含量 Chl b content	6.89 *	22.05 ***	0.14 ^NS
叶绿素a/b Chl a/b ratio	70.32 ***	12.15 ***	1.8 ^NS
光合放氧速率 Photosynthetic oxygen evolution rate	11.99 **	73.98 ***	3.58 ^NS
叶片Na⁺含量 Na⁺content in leaves	63.75 ***	9 188.70 ***	39.26 ***
根系Na⁺含量 Na⁺content in roots	5.99 *	42.48 ***	1.8 ^NS
叶片Cl ^-含量 Cl^- content in leaves	88.12 ***	271.53 ***	1.54 ^NS
根系Cl ^-含量 Cl^- content in roots	11.10 **	37.19 ***	1.38 ^NS

Fig. 2 Effect of NaCl on the content of chlorophyll a (A)、chlorophyll b (B) and chlorophyll a/b ratio (C) in leaves of Suaeda salsa under different habitats (mean ± SD). Notes see Fig.1.

Fig. 3 Effect of NaCl on the rate of photosynthetic oxygen evolution in leaves of Suaeda salsa under different habitats (mean ± SD). Notes see Fig. 1.

Fig. 4 Effect of NaCl on the content of Na+ (A, C) and Cl- (B, D) in leaves and roots of Suaeda salsa under different habitats (mean ± SD). Notes see Fig. 1.

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