Phosphorus deficiency enhances plasma membrane H+ -ATPase activity and citrate exudation in greater purple lupin (Lupinus pilosus)

Functional Plant Biology : FPB
Ayalew LigabaHideaki Matsumoto

Abstract

The response of greater purple lupin (Lupinus pilosus L.) to a combination of phosphorus (P) deficiency and aluminium (Al) toxicity is unknown, and the mechanisms involved in the exudation of organic anions from greater purple lupin have not been reported. Therefore, plants grown with (+P) or without (-P) 250 µm P were exposed to 0 or 50 µm AlCl3 and the amount of organic anions exuded and the activities of plasma membrane H+-ATPase (E.C 3.6.3.6) and H+-pumps were investigated. Twenty days of P deficiency resulted in significantly reduced shoot growth and increased proteoid root formation. Exposure to 50 µm AlCl3 did not induce citrate exudation but did induce some malate exudation in -P plants. In contrast, P deficiency did induce exudation of citrate. Enhanced citrate exudation was attributed to the large increase in the activity of plasma membrane H+-ATPase and associated H+ transport. This was shown by the inhibitory effect of vanadate on plasma membrane H+-ATPase activity in vitro and on citrate exudation in vivo. However, vanadate did not suppress the exudation of malate. During 9 h of Al exposure, exudation of citrate showed a continuing increase for both -P and +P plants, while malate exudation increased only during the...Continue Reading

References

Nov 10, 1998·Plant Physiology·Z Ma, S C Miyasaka
Mar 23, 2004·Physiologia Plantarum·Ayalew LigabaHideaki Matsumoto

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Citations

Aug 5, 2011·Journal of the Science of Food and Agriculture·Rong Fu ChenRen Fang Shen
Feb 6, 2017·The New Phytologist·Ayalew Ligaba-OsenaMiguel Piñeros
Nov 2, 2017·Frontiers in Plant Science·Jiarong ZhangQi Chen

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