Mechanisms of Exogenous Nitric Oxide and 24-Epibrassinolide Alleviating Chlorosis of Peanut Plants Under Iron Deficiency

SONG Yiling; DONG Yuanjie; TIAN Xianyi; WANG Wanwan; Zhenli HE

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Mechanisms of Exogenous Nitric Oxide and 24-Epibrassinolide Alleviating Chlorosis of Peanut Plants Under Iron Deficiency

机译：外源一氧化氮和24-表油菜素内酯缓解缺铁条件下花生植株绿化的机理

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Iron (Fe) is a crucial transition metal for all living organisms including plants;however,Fe deficiency frequently occurs in plant because only a small portion of Fe is bioavailable in soil in recent years.To cope with Fe deficiency,plants have evolved a wide range of adaptive responses from changes in morphology to altered physiology.To understand the role of nitric oxide (NO) and 24-epibrassinolide (EBR) in alleviating chlorosis induced by Fe deficiency in peanut (Arachis hypogaea L.) plants,we determined the concentration of chlorophylls,the activation,uptake,and translocation of Fe,the activities of key enzymes,such as ferric-chelate reductase (FCR),proton-translocating adenosine triphosphatase (H+-ATPase),and antioxidant enzymes,and the accumulation of reactive oxygen species (ROS) and malondialdehyde (MDA) of peanut plants under Fe sufficiency (100 μmol L-1 ethylenediaminetetraacetic acid (EDTA)-Fe) and Fe deficiency (0 μmol L-1 EDTA-Fe).We also investigated the production of NO in peanut plants subjected to Fe deficiency with foliar application of sodium nitroprusside (SNP),a donor of NO,and/or EBR.The results showed that Fe deficiency resulted in severe chlorosis and oxidative stress,significantly decreased the concentration of chlorophylls and active Fe,and significantly increased NO production.Foliar application of NO and/or EBR increased the activity of antioxidant enzymes,superoxide dismutase,peroxidase,and catalase,and decreased the ROS and MDA concentrations,thus enhancing the resistance of plants to oxidative stress.Application of NO also significantly increased Fe translocation from the roots to the shoots and enhanced the transfer of Fe from the cell wall fraction to the cell organelle and soluble fractions.Consequently,the concentrations of available Fe and chlorophylls in the leaves were elevated.Furthermore,the activities of H+-ATPase and FCR were enhanced in the Fe-deficient plants.Simultaneously,there was a significant increase in NO production,especially in the plants that received NO,regardless of Fe supply.These suggest that NO or EBR,and,especially,their combination are effective in alleviating plant chlorosis induced by Fe deficiency.

机译：铁（Fe）是包括植物在内的所有生物的重要过渡金属;然而，近年来由于植物中仅一小部分可利用生物利用铁，因此植物中经常发生铁缺乏。从形态变化到生理变化的一系列适应性反应。为了了解一氧化氮（NO）和24-表油菜素内酯（EBR）在缓解花生（Arachis hypogaea L.）植物缺铁引起的缺绿病中的作用，我们确定了其浓度。叶绿素的分布，铁的活化，吸收和转运，铁螯合还原酶（FCR），质子转运腺苷三磷酸酶（H + -ATPase）和抗氧化酶等关键酶的活性以及活性氧的积累铁充足（100μmolL-1乙二胺四乙酸（EDTA）-Fe）和铁缺乏（0μmolL-1 EDTA-Fe）下花生植物的ROS（ROS）和丙二醛（MDA）。我们还研究了NO的产生叶面施用硝普钠（NO）和/或EBR的硝普钠（SNP）导致的缺铁花生植物中的结果表明，缺铁导致严重的绿化和氧化胁迫，显着降低了叶绿素和活性铁的浓度叶面喷施NO和/或EBR可提高抗氧化酶，超氧化物歧化酶，过氧化物酶和过氧化氢酶的活性，并降低ROS和MDA的浓度，从而增强植物对氧化胁迫的抵抗力。 NO也显着增加了铁从根到芽的转运，并增强了铁从细胞壁部分向细胞器和可溶性部分的转移，从而提高了叶片中有效铁和叶绿素的浓度。缺铁植物中H + -ATPase和FCR的含量增加。同时，NO产生显着增加，特别是在获得NO的植物中，无论铁的供应量如何。这些都表明NO或EBR，尤其是它们的组合可有效缓解由铁缺乏引起的植物萎黄病。

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《土壤圈（英文版）》 |2018年第6期|926-942|共17页
作者
SONG Yiling; DONG Yuanjie; TIAN Xianyi; WANG Wanwan; Zhenli HE;
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作者单位

College of Resources and Environment, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer, Shandong Agricultural University, Tai'an 271018 China;

College of Resources and Environment, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer, Shandong Agricultural University, Tai'an 271018 China;

College of Resources and Environment, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer, Shandong Agricultural University, Tai'an 271018 China;

College of Resources and Environment, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer, Shandong Agricultural University, Tai'an 271018 China;

Indian River Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce FL 34945 USA;

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
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Mechanisms of Exogenous Nitric Oxide and 24-Epibrassinolide Alleviating Chlorosis of Peanut Plants Under Iron Deficiency

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