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首页> 外文期刊>Acta Physiologiae Plantarum >Effects of selenite on the growth of alfalfa (Medicago sativa L. cv. Sadie 7) and related physiological mechanisms
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Effects of selenite on the growth of alfalfa (Medicago sativa L. cv. Sadie 7) and related physiological mechanisms

机译：硒矿对苜蓿生长的影响（Medicago Sativa L.CV.Adie 7）及相关生理机制

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摘要

Selenium (Se) is indispensable to animals. The aims of this study were to explore the threshold dose of Se application in soil and reveal the mechanism of selenite effect on alfalfa growth, which is important for producing Se-enriched forage. Pot experiments were carried out in a greenhouse to explore the physiological mechanisms that are related to the response of forage crop to Se application. Alfalfa plants were treated with different Se levels (Se as Na2SeO3 dissolved in water was evenly sprinkled on the soil) to determine the effects of selenite supply on antioxidant activity, photosynthetic parameters, root activities, and the absorption of essential elements of alfalfa. Compared with the control plants, those treated with 5 and 10mgkg(-1) Se exhibited increased shoot Se concentrations by 4.5- and 8.1-fold, respectively. The Se partitioning factors for alfalfa ranged from 0.47 to 0.89. The dry weights of roots and whole plants reached maximum values after applying 1mgkg(-1) Se. At 20mgkg(-1) Se, plant growth was not inhibited in contrast to the control plants, and the activities of antioxidants superoxide dismutase (SOD), peroxidase (POD), and glutathione peroxidase (GSH-Px) increased, whereas the MDA content decreased significantly. With low-dose Se, the photosynthetic parameters (except for intercellular CO2 concentration), leaf pigment content, and root activities were significantly enhanced, and the absorption of micronutrient elements (Fe and Mn) was promoted. However, at >20mgkg(-1) Se, the plant growth, antioxidant enzyme activity, photosynthetic parameters, root activity, and P and K absorption were inhibited. Alfalfa growth was not negatively affected by Se application less than 20mgkg(-1). Low-dose selenite (0.5 and 1mgkg(-1) Se) stimulated plant growth, mainly due to the stimulation of root growth by enhancing root activities and therefore promoting the absorption of P, K, Ca, Fe, and Mn. The increase in antioxidant enzyme activity and net photosynthetic rate partially resulted from the increased carotenoid content, which also contributed to the increasing dry matter at low-dose selenite levels. Given the relatively high transport efficiency of Se from root to overground part, alfalfa can be potentially used in the production of Se-enriched forage, and 10mgkg(-1) Se is the optimum reference dose of Se application in soil.
机译：硒（SE）对动物是必不可少的。本研究的目的是探讨土壤中SE施用的阈值剂量，揭示亚硒酸盐效应对苜蓿生长的机制，这对于生产富集的饲料很重要。在温室中进行罐实验，探讨与饲料作物对SE应用的响应有关的生理机制。苜蓿植物被用不同的SE水平处理（作为溶解在水中的Na2 SeO 3均匀地撒在土壤上）以确定硒矿供应对抗氧化活性，光合参数，根活和苜蓿基本要素的吸收的影响。与对照植物相比，用5和10mgkg（-1）硒处理的那些分别呈现出芽Se浓度的增加4.5％和8.1倍。 Alfalfa的SE分区因子范围为0.47至0.89。在施加1mgkg（-1）Se后，根和整株的干重达到最大值。在＆ 20mgkg（-1）SE，与对照植物相比，植物生长并未抑制，抗氧化剂超氧化物歧化酶（SOD），过氧化物酶（POD）和谷胱甘肽过氧化物酶（GSH-PX）的活性增加，而且MDA含量显着下降。通过低剂量SE，显着提高了光合参数（外细胞CO 2浓度除外），叶子颜料含量和根系活性，促进了微量营养素（Fe和Mn）的吸收。然而，在> 20mgkg（-1）Se，植物生长，抗氧化酶活性，光合参数，根活性和P和K吸收被抑制。 Alfalfa的生长对于小于20mgkg（-1）的SE应用没有负面影响。低剂量硒沸石（0.5和1mgkg（-1）SE）刺激植物生长，主要是由于通过增强根活性来刺激根生长，因此促进P，K，Ca，Fe和Mn的吸收。抗氧化酶活性的增加和净光合速​​率部分是由类胡萝卜素含量增加的导致，这也导致低剂量硒水平的干物质增加。鉴于Se的较高运输效率从根到过度部分，苜蓿可以潜在地用于富集牧草的生产中，1​​0mgkg（-1）SE是土壤中SE应用的最佳参考剂量。

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  • 来源
    《Acta Physiologiae Plantarum》 |2019年第6期|共11页
  • 作者

    Bai Binqiang; Wang Zi; Gao Limin; Chen Wei; Shen Yixin;

  • 作者单位

    Nanjing Agr Univ Coll Agrograssland Sci 1 Wei Gang Rd Nanjing 210095 Jiangsu Peoples R China;

    Nanjing Agr Univ Coll Agrograssland Sci 1 Wei Gang Rd Nanjing 210095 Jiangsu Peoples R China;

    Nanjing Agr Univ Coll Agrograssland Sci 1 Wei Gang Rd Nanjing 210095 Jiangsu Peoples R China;

    Nanjing Agr Univ Coll Agrograssland Sci 1 Wei Gang Rd Nanjing 210095 Jiangsu Peoples R China;

    Nanjing Agr Univ Coll Agrograssland Sci 1 Wei Gang Rd Nanjing 210095 Jiangsu Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 植物学;
  • 关键词

    Antioxidant activity; Medicago sativa; Photosynthesis; Se-enriched forage; Selenium;

    机译：抗氧化活性;Medicago sativa;光合作用;富集的牧草;硒;

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