کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5532338 | 1549931 | 2017 | 9 صفحه PDF | دانلود رایگان |

- The individual effects of Na+ and Clâ on three different plant species useful in the remediation of dryland salinity were verified.
- Their photosynthetic efficiency and growth were measured.
- The tested plant species would be useful in remediating dryland salinity, although their capacities vary.
- This study has relevance in remediating salinity-affected landscapes.
This study aimed to measure the effects of elevated levels of Na+ and Clâ on ion concentration, growth, and photosynthetic performance of Melilotus siculus, Tecticornia pergranulata, and Thinopyrum ponticum in pot trials under controlled glasshouse conditions. Experiments were conducted using Na+ and Clâ dominant saline soil treated with constituted saline solutions (0, 2.0 and 4.0Â dSÂ mâ1 Na+ or Clâ). Maximum Na+ and Clâ concentration was in T. pergranulata shoots; maximum Na+ concentration was in T. pergranulata roots, whereas maximum Clâ in T. ponticum roots. Maximum quantum yield of PSII [Fv/Fm] values did not change significantly. Net-photosynthetic rate [Pn] and stomatal conductance [gs] values increased and non-photochemical quenching [NPQ] value decreased significantly in T. pergranulata with increasing Na+ dominant treatments and the reverse occurred in Clâ dominant treatments. Pn, gs, and NPQ values did not significantly change in T. ponticum with increasing Na+ and Clâ dominant treatments. The shoot and root biomasses of T. pergranulata were the maximum at 4.0Â dSÂ mâ1 Na+ dominant treatment. In T. ponticum, the maximum shoot and root fresh masses and shoot dry mass occurred in the control treatment and the maximum root dry mass occurred in the 2.0Â dSÂ mâ1 Clâ dominant treatment. In T. pergranulata, strong positive correlations occurred between Na+ concentration in shoots and salt tolerance (shoot mass over control) and moderately positive correlation occurred between Clâ concentration in shoots and salt tolerance. However, strong negative correlations were observed between Na+ and Clâ concentration in shoots and salt tolerance in T. ponticum as well as between Clâ concentration in shoots and salt tolerance in M. siculus. Our glasshouse experiments indicate that 4.0Â dSÂ mâ1 Clâ solutions in the soil was more intensely damaging than that of Na+. The greatest concentration of both Na+ and Clâ was in T. pergranulata under the tested circumstances indicating it to be the candidate of choice for restoring saline soils, followed in capacity by M. siculus and T. ponticum.
Journal: Flora - Volume 228, March 2017, Pages 1-9