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

20Citations
Citations of this article
13Readers
Mendeley users who have this article in their library.
Get full text

Abstract

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 100mM NaCl for 12h 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. Ca 2+ , H 2 O 2 , NO, and extracellular ATP (eATP) enhanced Na + extrusion by 27-152% in the salinized roots of K. obovata and A. corniculatum. Moreover, eATP, H 2 O 2 , and Ca 2+ 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 Ca 2+ in A. corniculatum. In contrast, NO reduced the Na + efflux elicited by eATP, H 2 O 2 , and Ca 2+ 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, Ca 2+ interacted with H 2 O 2 , NO, and eATP to reduce the K + loss during salt treatment, whereas eATP enhanced the inhibitory effect of H 2 O 2 , Ca 2+ , 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. © 2014 Elsevier B.V.

Cite

CITATION STYLE

APA

Lang, T., Sun, H., Li, N., Lu, Y., Shen, Z., Jing, X., … Chen, S. (2014). 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. Aquatic Botany, 119, 33–43. https://doi.org/10.1016/j.aquabot.2014.06.009

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free