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Seasonal changes in chemical composition and construction costs of grapevine tissues

机译：葡萄组织化学成分和建筑成本的季节性变化

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Modelling of the whole-vine carbon balance requires accurate estimates of tissue construction costs, i.e. the amount of glucose involved in the synthesis of a unit of biomass. In order to quantify construction costs during the vine's growth cycle, chemical compositions of leaves, stems, fruits, fine roots and trunk of 10-year-old grapevines (cv. Merlot) were determined in two seasons. Tissue construction costs were estimated using (ⅰ) an approach based on the quantification of the amount of glucose required for the synthesis of major chemical components of vine organs by the most probable metabolic pathways (coded as CC_p) and (ⅱ) a simpler technique in which costs were derived from tissue ash, carbon and nitrogen concentrations (coded as CC_w). Both methods were well-correlated in all grapevine tissues despite CC_p values were higher than CC_w estimates. Grapevine leaves had higher concentrations of compounds with a high proportion of C and N atoms (proteins, lipids and phenolics) and higher CC_w values throughout the season than other tissues. Small variation in CC_w values how- ever were observed seasonally in vegetative tissues despite their chemical composition varied considerably with plant development. Significant changes in CC_w appeared in berry tissues between fruit set and maturity, reflecting a proportional increase in concentration of inexpensive metabolites (soluble sugars and organic acids).
机译：全藤碳平衡的模型需要准确估算组织建设成本，即单位生物量单位合成中涉及的葡萄糖量。为了量化葡萄藤生长周期中的建设成本，在两个季节中确定了10年历史的葡萄藤（cv。Merlot）的叶子，茎，果实，细根和树干的化学成分。使用以下方法估算组织构建成本：（ⅰ）一种方法，该方法基于通过最可能的代谢途径（编码为CC_p）量化葡萄器官主要化学成分的合成所需的葡萄糖量的量化方法，以及（ⅱ）采用更简单的方法其中的成本来自组织灰分，碳和氮的浓度（编码为CC_w）。尽管CC_p值高于CC_w估计值，但两种方法在所有葡萄组织中均具有良好的相关性。与其他组织相比，整个季节中，葡萄叶中的C和N原子比例较高的化合物（蛋白质，脂质和酚类）的浓度较高，CC_w值较高。尽管植物的化学成分变化很大，但是在营养组织中季节性观察到CC_w值的微小变化。 CC_w的显着变化出现在果实定居和成熟之间的浆果组织中，反映出廉价代谢产物（可溶性糖和有机酸）浓度成比例增加。

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