Tomato Fruit Antioxidants in Relation to Salinity and Greenhouse Climate
Tomato Fruit Antioxidants in Relation to Salinity and Greenhouse Climate
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DOI：
10.1021/jf304660d
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发表时间：
2013-02-06
影响因子：
6.1
通讯作者：
Diarra, Moussa
中科院分区：
文献类型：
--
作者：
Ehret, David L.;Usher, Kevin;Diarra, Moussa
进行了为期两年的温室番茄抗氧化剂研究。植物连续处理与营养液电导率（EC）为2，4，或6 dS m（-1）。增加EC降低单株产量和果实大小。氧自由基吸收能力（ORAC），叶黄素，β-胡萝卜素，番茄红素和维生素C的浓度进行了评估，在收获的水果。ORAC和除叶黄素外的所有抗氧化剂均随EC增加。10个抗氧化代谢相关基因在成熟果实中均不受盐胁迫的影响，但其中3个基因（ZDS、CrtR-b1和NCED 1）的表达随果实发育阶段而变化。抗氧化剂浓度与温室气候条件有关。β-胡萝卜素、番茄红素、叶黄素和维生素C对光呈负反应，而对温度呈正反应，而ORAC则无反应。抗氧化剂与EC和气候因子的多元回归分析表明，抗氧化剂对光照和温度的反应比EC更强烈。
A two-year study of antioxidants in greenhouse tomato was conducted. Plants were treated continuously with nutrient solution electrical conductivities (EC) of 2, 4, or 6 dS m(-1). Increasing EC reduced yield per plant and fruit size. Oxygen radical absorbance capacity (ORAC), lutein, beta-carotene, lycopene, and vitamin C concentrations were evaluated in harvested fruit. ORAC and all antioxidants with the exception of lutein increased with EC. None of the 10 genes involved in antioxidant metabolism were affected by salinity in ripe fruit, but the expression of three of them (ZDS, CrtR-b1, and NCED1) varied with the stage of fruit development. Antioxidant concentrations were related to greenhouse climatic conditions. beta-Carotene, lycopene, lutein, and vitamin C responded negatively to light and positively to temperature, whereas ORAC was unresponsive. Multiple regressions of antioxidants in relation to EC and climatic factors showed that antioxidants responded more strongly to light and temperature than to EC.