Differential effects of salt stress on osmotic adjustment and solutes allocation on the basis of root and leaf tissue senescence of two silage maize (Zea mays L.) varieties
Differential effects of salt stress on osmotic adjustment and solutes allocation on the basis of root and leaf tissue senescence of two silage maize (Zea mays L.) varieties
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DOI：
10.1016/j.indcrop.2009.09.007
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发表时间：
2010-01-01
影响因子：
5.9
通讯作者：
Denden, Mounir
中科院分区：
文献类型：
--
作者：
Hajlaoui, Hichem;El Ayeb, Naceur;Denden, Mounir
比较了盐胁迫对两个青贮玉米品种根叶组织衰老过程中渗透调节和溶质积累的影响。在温室条件下，用0、34、68和102 mMNaC l对两个饲用玉米品种(Aristo和Arper)的幼苗进行了6周的胁迫试验。测定了初生根和3个叶期(幼叶、成熟叶和衰老叶)的渗透势(OP)、渗透调节(OA)和溶质积累。此外，为了研究甜菜根发育过程中的脯氨酸和甘氨酸甜菜碱在根发育过程中的分布，在两个品种的初生根顶端的不同位置分析了这两种物质的含量，总干物质含量随着盐度的增加而显著下降，且Aristo的下降幅度大于Arper。盐胁迫对离子状态的影响在根中比叶中更明显，在老叶中比年轻叶中更明显。在这种情况下，阿里斯托表现得比阿珀更敏感。根-叶组织的年龄与脯氨酸和甜菜碱的分配密切相关，作为盐胁迫的响应。被展示出来了。在胁迫处理过程中，这两种成分在根生长区和幼叶中的积累量较高。总游离氨基酸(FAA)和糖在根和叶中积累，但在成熟叶中优先积累。幼叶中的有机溶质含量大于成熟和/或衰老叶片中的含量，Arper的有机溶质对此的贡献率高于Arista。此外，甘氨酸、甜菜碱和脯氨酸似乎是主要在种植区对油酸有重要贡献的主要溶质，其次是糖和其他油酸。然而，无机溶质(K+和Ca~(2+))似乎并不在OA中起重要作用，因为它们的数量往往因耐盐性而减少。(C)2009爱思唯尔B.V.保留所有权利。
The comparative effects of salt stress on osmotic adjustment and solutes accumulation in relation to root-leaf tissue senescence of two silage maize varieties were examined. Studies were carried out with seedlings of two forage maize varieties (Aristo and Arper) subjected to 0, 34, 68 and 102 mM NaCl for 6 weeks under glasshouse conditions. Osmotic potential (OP), osmotic adjustment (OA) and solutes accumulation were quantified in primary roots and in three leaf stages (young, mature and senescent leaves). Moreover, in order to assess the distribution of proline and glycine betaine during root development, the two components were analyzed at different position from the primary root apex of both varieties.The total dry matter was significantly dropped with increasing salinity and reduction was greater in Aristo than in Arper. Salt stress impact in terms of ionic status was more pronounced in roots than in leaves and in older leaves than younger ones. In this setting, Aristo displayed a more sensitivity than Arper. A close relationship between the age of root-leaf tissue and proline and glycine betaine allocation, as salinity response. was shown. During the stress treatment, the accumulation of the two components was higher in growing regions of roots and in young leaves. While total free amino acids (FAA) and sugars were accumulated in roots as well as leaves but preferentially in the mature leaves. The capacity of OA was greater in young than in mature and/or senescent leaves and the contribution efficiency of organic solutes to this occurrence tended to be higher in Arper than in Arista. Moreover, glycine betaine and proline appeared to be the main solutes that contributed ably to OA mainly in growing regions followed by sugars and other FAA. Inorganic solutes (K+ and Ca2+), however, did not seem to play an important role in OA since their amounts were often reduced in response to salt tolerance. (C) 2009 Elsevier B.V. All rights reserved.