Impacts of water stress on gas exchange, water relations, chlorophyll content and leaf structure in the two main Tunisian olive (Olea europaea L.) cultivars
Impacts of water stress on gas exchange, water relations, chlorophyll content and leaf structure in the two main Tunisian olive (Olea europaea L.) cultivars
复制标题
DOI：
10.1016/j.scienta.2008.08.006
复制
发表时间：
2009-02-03
影响因子：
4.3
通讯作者：
Zarrouk, Mokhtar
中科院分区：
文献类型：
--
作者：
Guerfel, Mokhtar;Baccouri, Olfa;Zarrouk, Mokhtar
研究了两种橄榄(Olea uropaea L.)叶片结构对减少失水的适应性。在水分胁迫条件下生长的品种(Chemlali和Chetoui)。叶片测量包括叶片组织厚度、气孔密度、毛密度、比叶面积、叶密度、水分关系和气体交换。我们发现这两个品种之间存在着相当大的基因差异。切姆拉利对水分胁迫表现出较强的耐性，栅栏薄壁组织较厚，气孔密度和毛密度较高。银杏叶片的比叶面积较小，叶组织密度较高，净CO2同化率下降较小。从形态结构水平上讨论了这两个品种应对水分亏缺的机制。叶片的形态和结构特征与生理观察相一致，有助于解释橄榄变异的原因。切姆拉利的抗旱性比cv.切图伊。此外，从化学植物的行为，我们认为该品种非常有希望在半干旱地区种植。(C)2008爱思唯尔B.V.保留所有权利。
Leaf structural adaptations for the reduction of water loss were examined in two olive (Olea europaea L.) cultivars (Chemlali and Chetoui) growing under water stress conditions. Leaf measurements included leaf tissue thickness, stomatal density, trichome density, specific leaf area, leaf density, water relations, and gas exchange. We found considerable genotypic differences between the two cultivars. Chemlali exhibited more tolerance to water stress, with a thicker palisade parenchyma, and a higher stomatal and trichome density. Chemlali leaves also revealed lower specific leaf area and had higher density of foliar tissue and lower reduction in net CO2 assimilation rate. The mechanisms employed by these two cultivars to cope with water deficit are discussed at the morpho-structural level. The morphological and structural characteristics of the leaves are in accordance with physiological observations and contribute to the interpretation of why the olive cv. Chemlali is more drought-tolerant than cv. Chetoui. Furthermore, from the behaviour of Chemlali plants we consider this cultivar very promising for cultivation in semi-arid areas. (c) 2008 Elsevier B.V. All rights reserved.