Plant and Soil

, Volume 346, Issue 1, pp 231–244

Relative contribution of seed phosphorus reserves and exogenous phosphorus uptake to maize (Zea mays L.) nutrition during early growth stages

  • Muhammad Nadeem
  • Alain Mollier
  • Christian Morel
  • Alain Vives
  • Loïc Prud’homme
  • Sylvain Pellerin
Regular Article

DOI: 10.1007/s11104-011-0814-y

Cite this article as:
Nadeem, M., Mollier, A., Morel, C. et al. Plant Soil (2011) 346: 231. doi:10.1007/s11104-011-0814-y

Abstract

Adequate phosphorus (P) nutrition during early stages is critical for maize growth. Our objective was to evaluate the relative contribution of seed P reserves and exogenous P to maize nutrition during early growth stages. Seedlings were grown with labeled nutrient solution (32P). Seedlings were harvested periodically over the course of the three-week study. Initially, 87% and 77% of the total C and N in seeds were located in the endosperm, whereas 86% of seed P was located in the scutellum as phytate. Up to the 7th day after sowing, 96% of phytate was hydrolyzed. Hydrolyzed forms of P were temporarily stored in the seed before being translocated to growing organs, suggesting that the hydrolysis of phytate was not a limiting step for P supply to seedlings. Significant P uptake by roots was observed from the 5th day after sowing on. Both sources of P supplied roots and leaves, with a slightly higher proportion of P from seed reserves going to leaves rather than to roots. Of total seed P, 60% and 92% was exported towards newly growing seedlings till 7th and 17th days after sowing and ceased to be a significant source of P for growth thereafter. We conclude that although both P supply processes overlap in time, seed P was the main P source during early growth stages.

Keywords

MaizeGerminationPhosphorusPhytateRemobilizationP-uptakeIsotopeEcophysiology

Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Muhammad Nadeem
    • 1
  • Alain Mollier
    • 1
  • Christian Morel
    • 1
  • Alain Vives
    • 1
  • Loïc Prud’homme
    • 1
  • Sylvain Pellerin
    • 1
  1. 1.INRA, UMR 1220 TCEMVillenave d’Ornon CedexFrance