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首页> 美国卫生研究院文献>Annals of Botany >An Investigation of the Seasonal Pattern of Mannitol Content in Deciduous and Evergreen Species of the Oleaceae Growing in Northern Sicily
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An Investigation of the Seasonal Pattern of Mannitol Content in Deciduous and Evergreen Species of the Oleaceae Growing in Northern Sicily

机译：西西里岛北部蔷薇科落叶常绿树种甘露醇含量的季节性变化规律研究

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In several species of the Oleaceae, mannitol, already present at considerable levels, accumulates in response to stress. This family comprises both deciduous and evergreen species, and we investigated the role of mannitol in deciduous malacophyll and evergreen sclerophyll species growing under the same conditions in the field. The relationship between mannitol content and changes in rainfall or temperature was also studied. The mannitol content of leaves of Fraxinus ornus L., F. angustifolia Vahl., Olea europaea L. and Phillyrea media L. was determined by gas chromatography. Leaf samples were collected once a month for 1 year. In the two ash species, the seasonal pattern of mannitol content appeared the same: a gradual increase in spring, peaking in summer, followed by a gradual decrease. The mannitol content was similar in both species, ranging between 260 and 720 µmol g–1 d. wt. The seasonal pattern of mannitol content in Olea and Phillyrea was similar for both species, but unlike that of Fraxinus did not show a summer peak. Rainfall was negatively correlated with the seasonal increase of mannitol content in ash. Mannitol content increased gradually during drought, reaching a maximum value at the end of the dry season. Temperature did not have a direct influence on mannitol content. In Olea and Phillyrea, variations in mannitol content were poorly correlated with rainfall or temperature, indicating that mannitol does not have a primary role in the response of these species to the hot, dry summer conditions.
机译：在豆科的几种物种中，甘露醇的含量已经很高，它们会在压力下积累。该家族包括落叶和常绿树种，我们研究了甘露醇在相同条件下在该领域中生长的落叶速生植物和常绿硬叶种中的作用。还研究了甘露醇含量与降雨或温度变化之间的关系。用气相色谱法测定水曲柳，安氏F. anhlifolia Vahl，欧洲油橄榄和费城培养基L.的甘露醇含量。一年一次每月收集一次叶片样品。在这两种灰种中，甘露醇含量的季节性模式似乎是相同的：春季逐渐增加，夏季达到峰值，然后逐渐减少。两种物种中的甘露醇含量相似，在260至720 µmol g –1 d之间。重量两种植物的油橄榄和费城地区甘露醇含量的季节性模式相似，但与水曲柳不同的是没有夏季高峰。降雨与灰分中甘露醇含量的季节性增加呈负相关。甘露醇含量在干旱期间逐渐增加，在旱季结束时达到最大值。温度对甘露醇含量没有直接影响。在Olea和Phillyrea，甘露醇含量的变化与降雨或温度之间的相关性很差，这表明甘露醇在这些物种对炎热干燥的夏季条件的响应中没有主要作用。

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