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首页> 外文期刊>Journal of Agricultural and Food Chemistry >Differential Pigment Accumulation in Carrot Leaves and Roots during Two Growing Periods
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Differential Pigment Accumulation in Carrot Leaves and Roots during Two Growing Periods

机译：两个生长期胡萝卜叶和根中色素的积累

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摘要

Carotenoids are important secondary metabolites involved in plant growth and nutritional quality of vegetable crops. These pigments are highly accumulated in carrot root, but knowledge about the impact of environmental factors on their accumulation is limited. The purpose of this work was to investigate the impact of environmental variations on carotenoid accumulation in carrot leaves and roots. In this work, carrots were grown during two contrasting periods to maximize bioclimatic differences. In leaves, carotenoid and chlorophyll contents were lower in the less favorable growing conditions, whereas relative contents were well conserved for all genotypes, suggesting a common regulatory mechanism. The down-regulation of all genes under environmental constraints demonstrates that carotenoid accumulation is regulated at the transcriptional level. In roots, the decrease in alpha-carotene and lutein contents was accompanied by an increase of beta-carotene relative content. At the transcriptional level, LCYB and ZEP expression increased, whereas LCYE expression decreased, in the less favorable conditions, suggesting that carotenoid biosynthesis is switched toward the beta-branch.
机译：类胡萝卜素是参与植物生长和蔬菜作物营养质量的重要次生代谢产物。这些色素在胡萝卜根中高度积累，但是有关环境因素对其积累的影响的知识有限。这项工作的目的是调查环境变化对胡萝卜叶和根中类胡萝卜素积累的影响。在这项工作中，胡萝卜在两个对比时期生长，以最大程度地改善生物气候差异。在较不利的生长条件下，叶片中的类胡萝卜素和叶绿素含量较低，而所有基因型的相对含量均得到很好的保守，表明存在共同的调控机制。在环境限制下所有基因的下调表明，类胡萝卜素的积累在转录水平受到调控。在根部，α-胡萝卜素和叶黄素含量的减少伴随着β-胡萝卜素相对含量的增加。在转录水平上，在较差的条件下，LCYB和ZEP表达增加，而LCYE表达减少，这表明类胡萝卜素的生物合成向β分支转移。

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