کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4527755 1625823 2014 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Multiple signaling networks of extracellular ATP, hydrogen peroxide, calcium, and nitric oxide in the mediation of root ion fluxes in secretor and non-secretor mangroves under salt stress
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم آبزیان
پیش نمایش صفحه اول مقاله
Multiple signaling networks of extracellular ATP, hydrogen peroxide, calcium, and nitric oxide in the mediation of root ion fluxes in secretor and non-secretor mangroves under salt stress
چکیده انگلیسی


• Salt signal networks controlling ion homeostasis were established in two mangroves.
• H2O2, eATP, Ca2+ interacted with each other to increase Na+ extrusion in mangroves.
• NO enhanced the Na+ efflux elicited by Ca2+ in salt-treated A. corniculatum.
• NO reduced the Na+ efflux that enhanced by eATP, H2O2, Ca2+ in salinized K. obovata.
• H2O2, eATP, NO, and Ca2+ had an additive effect to reduce the salt-elicited K+ loss.

Using 3-month-old seedlings of Kandelia obovata and Aegiceras corniculatum, we compared multiple signaling networks controlling K+/Na+ homeostasis in salt-secreting and non-secreting mangroves. K. obovata roots exhibited a higher capacity to extrude Na+ and take up H+ after exposure to 100 mM NaCl for 12 h compared to A. corniculatum. However, the salt-induced Na+/H+ exchange was inhibited by amiloride, a Na+/H+ antiporter inhibitor, and sodium orthovanadate, a H+-ATPase inhibitor, indicating that Na+ efflux resulted from active Na+ exclusion. Ca2+, H2O2, NO, and extracellular ATP (eATP) enhanced Na+ extrusion by 27–152% in the salinized roots of K. obovata and A. corniculatum. Moreover, eATP, H2O2, and Ca2+ interacted with each other to increase Na+ extrusion in the two species. However, the interactions between NO and other signals differed in the secretor and non-secretor mangroves. Under a saline environment, NO enhanced the Na+ efflux elicited by Ca2+ in A. corniculatum. In contrast, NO reduced the Na+ efflux elicited by eATP, H2O2, and Ca2+ in K. obovata. In the two mangrove species, salt caused a net K+ efflux, but it was markedly restricted by the K+ channel blocker TEA, indicating that the K+ efflux is mediated by K+-permeable channels. In A. corniculatum, Ca2+ interacted with H2O2, NO, and eATP to reduce the K+ loss during salt treatment, whereas eATP enhanced the inhibitory effect of H2O2, Ca2+, and NO on K+ efflux in the non-secretor K. obovata. Thus, species-specific salt signaling networks regulating root K+ and Na+ flux were established in the secreting and non-secreting mangroves.

Non-invasive recording of root K+ and Na+ fluxes to establish signaling networks of eATP, H2O2, Ca2+, and NO in ionic homeostasis control in secretor and non-secretor mangroves under salt stress.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Aquatic Botany - Volume 119, October 2014, Pages 33–43
نویسندگان
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