Fast changes in soluble carbohydrates and proline contents in tomato seedlings in response to ionic and non-ionic iso-osmotic stresses
Fast changes in soluble carbohydrates and proline contents in tomato seedlings in response to ionic and non-ionic iso-osmotic stresses
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DOI：
10.1016/s0176-1617(97)80156-3
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发表时间：
1997-08-01
影响因子：
4.3
通讯作者：
PerezAlfocea, F
中科院分区：
文献类型：
--
作者：
Balibrea, ME;RusAlvarez, AM;PerezAlfocea, F
研究了两个番茄品种(Lycopersicesculentum L.Mill.)它们的耐盐性不同(CVS.Pera和Volgogradski)。幼苗在离子胁迫(300mmoL L-1)和非离子等渗胁迫(380g kg-1聚乙二醇分子量6000)胁迫下处理24 h。盐胁迫使蔗糖含量下降，并显著促进了蔗糖在植株各器官中的积累，在盐敏感品种中的积累程度更大。伏尔加格拉德斯基。与盐胁迫相比，聚乙二醇等渗胁迫对果实中己糖含量的影响与盐分相似。根中蔗糖含量分别提高2.5倍和4倍。在这两种条件下，盐敏感品种的脯氨酸积累更为重要。在非离子胁迫下，这些溶质对渗透势的贡献率高达-0.3 Mpa，而在盐分胁迫下，与对照植物相比，它们对渗透势的贡献很小。观察到的可溶性碳水化合物和脯氨酸组成的快速变化与盐胁迫和非等渗胁迫下的渗透调节有关。
Qualitative and quantitative changes in soluble carbohydrates and proline contents were studied in young plants of two tomato cultivars (Lycopersicon esculentum L. Mill.) differing in their salt-tolerance (cvs. Pera and Volgogradskij). Seedlings were treated for 24 h with ionic (300 mmol L-1) and non-ionic isoosmotic (380 g kg(-1) polyethylene glycol MW 6000) stresses. Salinity provoked a decrease in the hexose contents and it also dramatically enhanced sucrose accumulation in all organs of the plants, and to a greater extent in the salt-sensitive cv. Volgogradskij. The PEG iso-osmotic stress, compared with saline conditions, only affected the hexose contents in a similar way to salinity in the cv. Volgogradskij, while it increased the sucrose content 2.5 and 4 times in the roots of Pera and Volgogradskij, respectively. Proline accumulation was more important in the salt-sensitive cultivar under both conditions. The contribution of these solutes to the osmotic potential was up to -0.3 MPa under non-ionic stress, but they had little influence under salinity compared with control plants. The fast changes observed in soluble carbohydrates and proline composition are discussed in relation to the osmotic adjustment under saline and non-permeant iso-osmotic stresses.