期刊
SOUTH AFRICAN JOURNAL OF BOTANY
卷 79, 期 -, 页码 39-47出版社
ELSEVIER
DOI: 10.1016/j.sajb.2011.11.007
关键词
Carotenoids; Chlorophyll; Photosynthesis; Salt stress
资金
- Tunisian Ministry of Higher Education and Scientific Research [LR10CBBC02]
- University of Pisa
- European Cooperation in the field of Scientific and Technical Research, COST Action [FA0901]
Seedlings of the obligate halophytes Sesuvium portulacastrum L. and Tecticornia indica (Willd.) subsp. indica were grown with 0, 200, or 400 mM NaCl for 13 weeks to investigate whether salt tolerance was related to maintenance of adequate photosynthetic activity and pigment equipment. Both species showed growth optimum at 200 mM NaCl and better tissue hydration under salinity but different photosynthetic response to salinity. CO2 assimilation rate and stomatal conductance of S. portulacastrum were highest at 200 mM NaCl, while in T. indica they decreased with salinity. Pigment content increased under salinity in both species. The de-epoxidation state in S. portulacastrum suggests the need for energy dissipation at 400 mM NaCl, while its salt-induced decline in T. indica, despite the reduced photochemistry, suggests the involvement of adaptive mechanisms other than the xanthophyll cycle. (C) 2011 SAAB. Published by Elsevier B.V. All rights reserved.
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