An Exogenous Source of Nitric Oxide Modulates Iron Nutritional Status in Peanut Seedlings (Arachis hypogaea L.)

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• 作者：Yiling Song ; Yuanjie Dong ; Xianyi Tian ; Xiaoying Bai…
• 刊名：Journal of Plant Growth Regulation
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：35
• 期：3
• 页码：730-743
• 全文大小：1,346 KB
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Sciences
  Cell Biology
  Agriculture
  Forestry
  
• 出版者：Springer New York
• ISSN：1435-8107
• 卷排序：35

文摘

Iron (Fe) deficiency chlorosis is a common and severe nutritional deficiency in plants, and nitric oxide (NO) is an important signaling molecule in regulating Fe homeostasis in plants. We studied the effect of sodium nitroprusside (SNP, an NO donor) on Fe uptake, translocation, storage, and activation in a greenhouse. The concentrations of active Fe, total Fe, and the ratio of active Fe to total Fe, the activities of key enzymes, and chlorophyll concentration were determined, and resistance to oxidative stress and mineral element distribution in peanut plants grown in Fe sufficiency and Fe deficiency (an absence of Fe and low level of Fe concentration) conditions were also investigated. The results showed that NO significantly increased the concentration of active Fe and the ratio of active Fe to total Fe in Fe-deficient plants, and increased active Fe concentration in leaves and stems of Fe-sufficient plants. NO application also increased Fe translocation from roots to the shoots and the accumulation of Fe in cell organelles and the soluble fraction in leaves, especially in the low-level Fe concentration condition, thus increased available Fe and chlorophyll concentration in leaves of Fe-deficient plants. The activities of key enzymes were regulated by NO, which effectively mitigated oxidative damages by enhancing the activities of antioxidant enzymes (SOD, POD, CAT), increasing H+-ATPase and Ca2+-ATPase activities to balance the ion (Fe, Ca, Mg and Zn) uptake and distribution in Fe-deficient plants. However, NO application had no obvious effect on these variables in Fe-sufficient plants. These results indicated that NO application can improve Fe uptake, translocation, and activation of related enzymes in Fe-deficient plants, thus mitigating the adverse effect of Fe deficiency.KeywordsActive FeAntioxidant enzymesFe deficiencyMineral elementNitric oxide