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  • Title: [Effects of selenium valence states and application concentrations on plant growth, ascorbate-glutathione cycle in Citrus junos cv. Ziyang Xiangcheng].
    Author: Sun XP, Luo YJ, Zhou GW, Yi HW, Chen YP, Wu Z, Xie YH.
    Journal: Ying Yong Sheng Tai Xue Bao; 2017 Nov; 28(11):3527-3534. PubMed ID: 29692095.
    Abstract:
    Potted Citrus. junos cv. Ziyang Xiangcheng seedlings were used to study the effects of selenium (Se) valence states (Se6+ and Se4+) on plant growth and antioxidants and antixodases in ascorbate(AsA)-glutathione (GSH) cycle. The results showed that Se6+ and Se4+ (from 1.0 mg·L-1 to 8.0 mg·L-1) stimulated the seedling growth by increasing plant height, leaf areas, and fresh or dry mass. Applying Se6+significantly increased plant Se levels mainly in leaf, and applying Se4+ slightly increased Se content mainly in root. Certain valence states and concentrations of Se increased leaf chlorophyll and hydrogen peroxide (H2O2) content. Se6+≤2.0 mg·L-1 treatments enhanced the activates of glutathione reductase (GR) and glutathione peroxidase (GPX), and the contents of GSH and oxidized glutathione (GSSG), while Se6+≥4.0 mg·L-1 treatments reduced the antioxidant contents and antixodase activities of GSH cycle. Moreover, Se4+≤ 2.0 mg·L-1 treatments increased the activities of dehydroascorbate reductase (DHAR) and ascorbate peroxidase (APX), and resulted in higher AsA/[AsA+dehydroascorbic acid (DHA)] ratio. When Se4+≥4.0 mg·L -1, the antioxidant contents and antixodase activities of GSH cycle were increased. Together, this study showed that different valence states and application concentrations of Se showed different influences on AsA-GSH cycle in citrus, and 2.0 mg·L-1 Se6+ and 4.0 mg·L-1 Se4+ were the best concentrations for plant growth. 以盆栽香橙为试材,分析不同施用浓度Se6+和Se4+对植株生长和抗坏血酸(AsA) -谷胱甘肽(GSH)循环的影响.结果表明: 两种价态硒均可促进香橙生长,主要表现在增加了叶面积、株高、鲜质量和干质量.施用Se6+显著提高了香橙硒含量,且硒主要分配在叶片;而施用Se4+虽能提高硒含量,但其含量远低于Se6+处理,且主要分配在根系.施硒提高了叶片叶绿素和过氧化氢(H2O2)含量,且Se6+处理高于Se4+处理.Se6+浓度≤2.0 mg·L-1处理能提高谷胱甘肽还原酶(GR)与谷胱甘肽过氧化物酶(GPX)活性、GSH与氧化型谷胱甘肽(GSSG)量,Se6+浓度≥4.0 mg·L-1处理降低GSH循环的物质和酶活性;而Se4+浓度≤ 2.0 mg·L-1处理能提高脱氢抗坏血酸还原酶(DHAR)与抗坏血酸过氧化物酶(APX)活性,且具有较高的AsA/[AsA+脱氢抗坏血酸(DHA)]比值,Se4+浓度≥4.0 mg·L-1 处理的GSH循环的物质和酶活性升高.综上,硒的不同价态和施用浓度对AsA-GSH循环相关物质含量和酶活性的影响不同.结合香橙生长指标和抗氧化水平,Se6+和Se4+的适宜浓度分别为2.0和4.0 mg·L-1.
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