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首页> 外文期刊>Journal of Experimental Botany >Biosynthesis of quebrachitol, a transportable photosynthate, in Litchi chinensis
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Biosynthesis of quebrachitol, a transportable photosynthate, in Litchi chinensis

机译：Beebrachitol的生物合成，一种可运输的光合酯，荔枝

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Although methylated cyclitols constitute a major proportion of the carbohydrates in many plant species, their physiological roles and biosynthetic pathway are largely unknown. Quebrachitol (2-O-methyl-chiro-inositol) is one of the major methylated cyclitols in some plant species. In litchi, quebrachitol represents approximately 50% of soluble sugars in mature leaves and 40% of the total sugars in phloem exudate. In the present study, we identified bornesitol as a transient methylated intermediate of quebrachitol and measured the concentrations of methyl-inositols in different tissues and in tissues subjected to different treatments. (CO2)-C-14 feeding and phloem exudate experiments demonstrated that quebrachitol is one of the transportable photosynthates. In contrast to other plant species, the biosynthesis of quebrachitol in litchi is not associated with osmotic stress. High quebrachitol concentrations in tissues of the woody plant litchi might represent a unique carbon metabolic strategy that maintains osmolality under reduced-sucrose conditions. The presence of bornesitol but not ononitol in the leaves indicates a different biosynthetic pathway with pinitol. The biosynthesis of quebrachitol involves the methylation of myo-inositol and the subsequent epimerization of bornesitol. An inositol methyltransferase gene (LcIMT1) responsible for bornesitol biosynthesis was isolated and characterized for the first time, and the biosynthesis pathways of methyl-inositols are discussed.
机译：虽然甲基化烯键醇在许多植物物种中构成碳水化合物的主要比例，但它们的生理作用和生物合成途径在很大程度上是未知的。 Quebrachitol（2-O-甲基甲基肌醇）是一些植物物种中的主要甲基化烯丙酮之一。在荔枝中，Quebrachitol代表了成熟叶片中的约50％的可溶性糖和韧皮渗透物中的40％的糖。在本研究中，我们将孕酸盐醇鉴定为Quebrach吲哚的瞬时甲基化中间体，并测量不同组织中的甲基 - 肌醇的浓度和经受不同治疗的组织。 （CO2）-C-14饲料和韧皮渗出物实验表明，Quebrachtol是可转运光合素之一。与其他植物物种相比，荔枝中Quebrach醇的生物合成与渗透压无关。木质植物荔枝组织中的高Quebrachitol浓度可能代表一种独特的碳代谢策略，可在减少蔗糖条件下保持渗透压态。叶片中的存在但在叶中没有ononitol表示不同的生物合成途径。 Quebrachitol的生物合成涉及肌醇肌醇的甲基化和随后的孕育醇的差异。分离出对孕酸盐酚生物合成的肌醇甲基转移酶基因（LCIMT1）第一次表征，并讨论了甲基 - 摩尼醇的生物合成途径。

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