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Remobilization of seed phosphorus reserves and their role in attaining phosphorus autotrophy in maize (Zea mays L.) seedlings

Published online by Cambridge University Press:  30 April 2014

Muhammad Nadeem ,
Alain Mollier ,
Christian Morel ,
Loïc Prud'homme ,
Alain Vives  and
Sylvain Pellerin
Muhammad Nadeem*
Affiliation:
INRA, UMR 1391 ISPA, F-33140 Villenave d'Ornon Cedex, France Sciences Agro, UMR 1391 ISPA, F-33170 Gradignan, France Department of Environmental Sciences, COMSATS Institute of Information Technology, Vehari, Pakistan
Alain Mollier
Affiliation:
INRA, UMR 1391 ISPA, F-33140 Villenave d'Ornon Cedex, France Sciences Agro, UMR 1391 ISPA, F-33170 Gradignan, France
Christian Morel
Affiliation:
INRA, UMR 1391 ISPA, F-33140 Villenave d'Ornon Cedex, France Sciences Agro, UMR 1391 ISPA, F-33170 Gradignan, France
Loïc Prud'homme
Affiliation:
INRA, UMR 1391 ISPA, F-33140 Villenave d'Ornon Cedex, France Sciences Agro, UMR 1391 ISPA, F-33170 Gradignan, France
Alain Vives
Affiliation:
INRA, UMR 1391 ISPA, F-33140 Villenave d'Ornon Cedex, France Sciences Agro, UMR 1391 ISPA, F-33170 Gradignan, France
Sylvain Pellerin
Affiliation:
INRA, UMR 1391 ISPA, F-33140 Villenave d'Ornon Cedex, France Sciences Agro, UMR 1391 ISPA, F-33170 Gradignan, France
*
*Correspondence E-mail: muha.nadeem@gmail.com
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Abstract

Successful remobilization of seed reserves is the driving force behind seedling establishment for maximum final crop outcomes. The remobilization of stored maize seed phosphorus (P), and its allocation towards growing seedlings is critical for P-autotrophy during early ontogeny. We aimed to (1) evaluate the time frame of the origin of P utilized by maize seedlings, including the heterotrophic, transitional and autotrophic phases; and (2) compare P and carbon (C) dynamics in both seed and seedling compartments during the same phases. Using isotopic signatures (32P), we identified different P fluxes (P-heterotrophy, P-transition and P-autotrophy) and determined the proportion of P fluxes from heterotrophic seed P and external P uptake during 23 d of early ontogeny. The P-heterotrophic growth phase lasted from the first to the fourth day after sowing, when seedlings were entirely made up of heterotrophic P originating from remobilized seed P pool. In our experimental conditions, the P-transitional phase, when growing seedlings were supported by both heterotrophic and autotrophic P, lasted from the fifth to the fifteenth day after sowing. Thereafter, seed P reserves were exhausted and seedlings depended entirely on external P uptake, indicating the P-autotrophic stage. Although seed P reserves were remobilized earlier than C reserves, the length of the three growth phases for P and C was similar in the maize seedlings.

Keywords

autotrophycarbonheterotrophymaizemineral nutritionphosphorus
Type
Research Papers
Information
Seed Science Research , Volume 24 , Issue 3 , September 2014 , pp. 187 - 194
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Copyright
Copyright © Cambridge University Press 2014 

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