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Seasonal variation in Daucus carota leaf-surface and leaf-tissue chemical profiles

机译：胡萝卜叶片表面和叶片组织化学特征的季节性变化

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The purpose of this work was to document seasonal changes in leaf-surface and whole-leaf chemistry of Daucus carota cohorts that differed in life-cycle phenology (winter annual, annual, or biennial), with particular focus on compounds that serve as contact oviposition stimulants for Papilio polyxenes, the black swallowtail butterfly. Cohorts of carrot plants exhibiting different life-cycle phenologies were established, and plants from each cohort were sampled periodically over two growing seasons. Extracts of leaf surfaces and leaf tissues were analyzed using HPLC and were compared quantitatively for the content of chlorogenic acid (CA), luteolin-7-O-(6"-O-malonyl)-beta-D-glucopyranoside (L7MG), and luteolin-7-glucoside (L7G). The pattern of seasonal variation in L7G and L7MG concentrations in leaf tissues of each cohort followed the predictions of the tissue value hypothesis: flavonoid concentrations are highest in the tissues of new alternate leaves of the reproductive shoot or in new spring foliage. Chlorogenic acid concentrations in leaf tissues increased throughout the growing season. Patterns of leaf-surface seasonal variation did not correlate with patterns in leaf-tissue chemistry for any carrot cohort. Rather, leaf-surface amounts of CA, L7G, and L7MG were highest at the point in the lifecycle when plants were differentiating or bolting.
机译：这项工作的目的是记录生命周期物候不同（冬季，每年，每年或每两年一次）的非洲胡萝卜种群的叶表面和全叶化学的季节性变化，特别关注用作接触产卵的化合物黑色凤尾蝶凤蝶多烯的兴奋剂。建立了表现出不同生命周期物候特征的胡萝卜植物队列，并在两个生长季节中定期取样每个队列的植物。使用HPLC分析叶表面和叶组织的提取物，并定量比较绿原酸（CA），木犀草素-7-O-（6“ -O-丙二酰基）-β-D-吡喃葡萄糖苷（L7MG）和luteolin-7-glucoside（L7G）。每个队列的叶子组织中L7G和L7MG浓度的季节性变化规律均遵循组织价值假说的预测：类黄酮浓度在生殖枝或在新的春季叶片中，整个生长期叶片组织中的绿原酸浓度均增加;任何胡萝卜群体的叶片表面季节性变化模式与叶片组织化学模式均不相关;相反，CA，L7G， L7MG和L7MG在生命周期中植物分化或抽ing的时间点最高。

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