Phosphorus acquisition and internal utilization efficiency in tropical maize genotypes

Pesquisa Agropecuária Brasileira

Sidney Netto Parentoni²  Claudio Lopes De Souza Júnior¹ 

[1] ,Embrapa Milho e SorgoSete Lagoas MG ,Brazil

关键词: Zea mays;    mineral nutrition;    phosphorus acquisition;    phosphorus use efficiency;    plant breeding;    quotient of utilization;    Zea mays;    nutrição mineral;    aquisição de fósforo;    eficiência de uso de fósforo;    melhoramento de plantas;    quociente de utilização;   

DOI  :  10.1590/S0100-204X2008000700014

来源: SciELO

【 摘 要 】

The objective of this work was to determine the relative importance of phosphorus acquisition efficiency (PAE - plant P uptake per soil available P), and phosphorus internal utilization efficiency (PUTIL - grain yield per P uptake) in the P use efficiency (PUE - grain yield per soil available P), on 28 tropical maize genotypes evaluated at three low P and two high P environments. PAE was almost two times more important than PUTIL to explain the variability observed in PUE, at low P environments, and three times more important at high P environments. These results indicate that maize breeding programs, to increase PUE in these environments, should use selection index with higher weights for PAE than for PUTIL. The correlation between these two traits showed no significance at low or at high P environments, which indicates that selection in one of these traits would not affect the other. The main component of PUTIL was P quotient of utilization (grain yield per grain P) and not the P harvest index (grain P per P uptake). Selection to reduce grain P concentration should increase the quotient of utilization and consequently increase PUTIL.

【 授权许可】

CC BY   
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