Abstract Benzenoid and terpenoid volatiles are the major compounds contributing to the unique floral scent of Jasminum auriculatum. Biosynthesis and emission of specialized scent metabolites showed maturation stage specific pattern; maximum scent emission was observed when flowers start unfurling and become fully opened under in situ condition. The activities of volatile biosynthesizing enzymes and expressions of several scent-related genes correlated well with the fragrance emission patterns. We also assessed the impact of varying air temperatures (20 °C, 25 °C, 30 °C and 35 °C) on the metabolism as well as vaporization of scent volatiles. The contents of both emitted and endogenous volatiles were higher at either 25 °C or 30 °C and showed relatively lower amounts at both border-range temperatures (20 °C and 35 °C). Further, the activities of key pathway enzymes and expressions of several scent-related genes under varying temperatures exhibited similar trends with the scent emission patterns. Analysis of non-volatile metabolites from flowers grown under different air temperatures suggests a perturbation occurring in the primary metabolism and immediate precursors of scent compounds. The knowledge base created through these studies shall be helpful in improving the yield of floral scent production from such horticulturally important plants in controlled cultivation systems.

中文翻译：

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花的成熟和气温变化影响茉莉花中气味挥发物的生物合成和排放

摘要 苯甲类和萜类挥发物是形成茉莉花独特花香的主要化合物。特殊气味代谢物的生物合成和释放表现出成熟阶段的特定模式；当花朵开始展开并在原位条件下完全打开时，观察到最大的气味散发。挥发性生物合成酶的活性和几种气味相关基因的表达与香味释放模式密切相关。我们还评估了不同气温（20°C、25°C、30°C 和 35°C）对气味挥发物的代谢和蒸发的影响。在 25 °C 或 30 °C 时，排放的和内源性挥发物的含量都较高，并且在两个边界范围温度（20 °C 和 35 °C）下的含量都相对较低。更多，关键途径酶的活性和几种气味相关基因在不同温度下的表达与气味排放模式表现出相似的趋势。对在不同气温下生长的花朵的非挥发性代谢物的分析表明，在初级代谢和气味化合物的直接前体中发生了扰动。通过这些研究创建的知识库将有助于提高受控栽培系统中此类重要园艺植物的花香产量。对在不同气温下生长的花朵的非挥发性代谢物的分析表明，在初级代谢和气味化合物的直接前体中发生了扰动。通过这些研究创建的知识库将有助于提高受控栽培系统中此类重要园艺植物的花香产量。对在不同气温下生长的花朵的非挥发性代谢物的分析表明，在初级代谢和气味化合物的直接前体中发生了扰动。通过这些研究创建的知识库将有助于提高受控栽培系统中此类重要园艺植物的花香产量。