The phosphorus requirement of N2 -fixing and urea-fed Acacia mangium

The New Phytologist
J M Ribet, J J Drevon

Abstract

The fast-growing leguminous tree Acacia mangium Willd, was grown for at least 22 wk in aerated solution culture either under N2 -fixing conditions or with 2 mmol urea per plant per wk. Inorganic phosphorus was supplied at between 1 and 100 μmol P(1) per plant per wk: the latter was determined to be the optimum P supply for growth. The external P requirement for growth and the efficiency of utilization of internal P were similar for both N sources. However, shoot growth and the concentrations of N and P in leaves were decreased by P deficiency to a slightly higher extent in N2 -fixing plants than in urea-fed plants. Even though P deficiency limited nodule growth more drastically than it did shoot growth, the fraction of P allocated to both nodules and nodule nitrogenase activity (acetylene reduction) increased with P deficiency. It is concluded that this increase in nitrogenase activity reflects a higher N requirement per unit nodule mass in P-deficient plants and that, once nodules are fully functional the efficiency of utilization of internal P in N2 -fixing A. mangium is high compared with that of other N2 -fixing legumes.

References

Jan 31, 1987·Lancet·T Waterston
Dec 1, 1971·The Biochemical Journal·W J Broughton, M J Dilworth
Sep 1, 1970·American Journal of Orthodontics·V DeAngelis
Aug 1, 1993·The New Phytologist·Peter M Attiwill, Mark A Adams

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Citations

Apr 4, 2014·TheScientificWorldJournal·Juan D León, Nelson W Osorio
Mar 27, 2012·The Science of the Total Environment·M E IsaacJ M Harmand
Nov 21, 2015·Ecology Letters·Nina Wurzburger, Lars O Hedin
Apr 27, 2019·Frontiers in Plant Science·Inga DirksIna C Meier
Mar 20, 2003·Plant Physiology·Peter H Graham, Carroll P Vance

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