Barhoumi Zouhaier, Djebali Wahbi, Chaïbi Wided, Abdelly Chedly, Smaoui Abderrazak
Laboratoire d'Adaptation des Plantes aux Stress Abiotiques, Centre de Biotechnologie de la Technopole de Borj-Cedria, BP 901, Hammam-Lif, 2050, Tunisia.
J Plant Res. 2007 Jul;120(4):529-37. doi: 10.1007/s10265-007-0094-z. Epub 2007 May 30.
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.
研究了盐度（400 mM NaCl）对水培生长的獐毛（Aeluropus littoralis (Willd) Parl.）植株生长、生物量分配、光合作用及叶片超微结构的影响。NaCl显著抑制了主要生长参数，并降低了叶片气体交换（如光合速率和气孔导度降低）。然而，NaCl盐度既不影响光合色素的组成，也不影响叶片含水量。叶片气体交换的降低似乎与叶肉厚度的减小以及叶绿体结构的严重紊乱有关，叶绿体形态畸形，类囊体膜扩张。值得注意的是，叶肉叶绿体比维管束鞘细胞的叶绿体对盐处理更敏感。结合獐毛的耐盐程度，讨论了NaCl毒性对叶片结构和超微结构的影响以及相关的生理意义。
