NDLI: Citrate exudation induced by aluminum is independent of plasma membrane H$^{+}$-ATPase activity and coupled with potassium efflux from cluster roots of phosphorus-deficient white lupin

Content Provider	Springer Nature Link
Author	Zeng, Houqing Feng, Xumeng Wang, Baolan Zhu, Yiyong Shen, Qirong Xu, Guohua
Copyright Year	2012
Abstract	Exudation of organic acid anions is one of the mechanisms responsible for aluminum (Al) tolerance. The plasma membrane (PM) H$^{+}$-ATPase is involved in the exudation of organic acid anions. However, the relationship between organic acid exudation and PM H$^{+}$-ATPase under Al toxicity remains unclear. This study aims to investigate the correlation among Al-induced citrate exudation, PM H$^{+}$-ATPase activity and counterions for citrate release from cluster roots of phosphorus-deficient (−P) white lupin.Al and various pharmacological agents were applied to incubate the cluster roots of P-deficient white lupin; the citrate exudation rate, PM H$^{+}$-ATPase activity and ion exudation of cluster roots were examined.Citrate exudation from cluster roots of P-deficient white lupin was induced by 50 μM Al treatment within 1.5 h, but no extra increase was found when the duration of Al treatment increased. The PM H$^{+}$-ATPase activity of cluster roots was insensitive to Al treatment, irrespective of Al concentration and duration of Al treatment. Al treatment increased K$^{+}$ efflux but not H$^{+}$ efflux from cluster roots. After application of pharmacological agents to P-deficient cluster roots under Al treatment or not, vanadate decreased H$^{+}$ efflux and increased K$^{+}$ efflux, but had no inhibitory effect on citrate exudation; fusicoccin increased H$^{+}$ efflux and citrate exudation, but decreased K$^{+}$ efflux; tetraethylammonium (TEA) chloride, a K$^{+}$-channel inhibitor, inhibited K$^{+}$ efflux and increased H$^{+}$ efflux.These results indicate that citrate exudation induced by combined treatment with P-deficiency and Al is independent of PM H$^{+}$-ATPase activity, and is coupled with K$^{+}$ efflux, which may compensate H$^{+}$ efflux for keeping the charge balance for Al-induced citrate exudation from cluster roots of P-deficient white lupin.
Starting Page	389
Ending Page	400
Page Count	12
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	366
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-09-08
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Al tolerance Citrate exudation Plasma membrane H$^{+}$-ATPase K$^{+}$ efflux Cluster root White lupin (Lupinus albus) Plant Sciences Soil Science & Conservation Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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