Salt impact on photosynthesis and leaf ultrastructure of <Emphasis Type="Italic">Aeluropus littoralis</Emphasis> |
| |
Authors: | Zouhaier Barhoumi Wahbi Djebali Wided Chaïbi Chedly Abdelly Abderrazak Smaoui |
| |
Institution: | (1) Laboratoire d’Adaptation des Plantes aux Stress Abiotiques, Centre de Biotechnologie de la Technopole de Borj-Cedria, BP 901, Hammam-Lif, 2050, Tunisia;(2) UR. Biologie et Physiologie Cellulaires Végétales, Faculté des Sciences de Tunis, 1060 Tunis, Tunisia |
| |
Abstract: | The effects of salinity (400 mM NaCl) on growth, biomass partitioning, photosynthesis, and leaf ultrastructure were studied
in hydroponically grown plants of Aeluropus littoralis (Willd) Parl. NaCl produced a significant inhibition of the main growth parameters and a reduction in leaf gas exchange (e.g.
decreased rates of photosynthesis and stomatal conductance). However, NaCl salinity affected neither the composition of photosynthesis
pigments nor leaf water content. The reduction in leaf gas exchange seemed to correlate with a decrease in mesophyll thickness
as well as a severe disorganisation of chloroplast structure, with misshapen chloroplasts and dilated thylakoid membranes.
Conspicuously, mesophyll chloroplasts were more sensitive to salt treatment than those of bundle sheath cells. The effects
of NaCl toxicity on leaf structure and ultrastructure and the associated physiological implications are discussed in relation
to the degree of salt resistance of A. littoralis. |
| |
Keywords: | Aeluropus littoralis Chloroplast NaCl Gas exchange Photosynthesis Ultrastructure |
本文献已被 PubMed SpringerLink 等数据库收录! |
|