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Variation in nitrogen use efficiency and root system size in temperate maize genotypes

By: Beem, J. Van | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico).
Contributor(s): Edmeades, G.O.|Banziger, M.|Mickelson, H.R.|Pena-Valdivia, C.B [eds.] | Smith, M.E [coaut.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Mexico, DF (Mexico) CIMMYT : 1997ISBN: 968-6923-93-4.Subject(s): Growth | Nitrogen content | Plant developmental stages | Plant physiology | Root systems | CIMMYT | Zea mays AGROVOC | Nitrogen fertilizers AGROVOC | Genotypes AGROVOC | Plant breeding AGROVOCDDC classification: 633.153 Summary: The potential for genetic improvement in nitrogen use efficiency (NUE) depends on the magnitude and nature of differences among varieties. The objective of this study was to evaluate NUE and its relationship to root system size in temperate maize genotypes. Twelve inbreds and ten hybrids were planted under two N levels (16 and 125 kg N ha-1) during 1993. Recognizing that root parameters may provide a partial explanation for differences in NUE, root system size was estimated using a portable capacitance meter. NUE differed significantly for inbreds and hybrids under both N treatments, with NUE under low N being roughly seven times greater than NUE under high N. In addition, there were wide differences in the genotypes' root system response to low N. No association was found between NUE and root system size as measured by capacitance. Thus, an increase in root system size would not appear to be an effective strategy for increased NUE.Collection: CIMMYT Publications Collection
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Publications Collection 633.153 EDM (Browse shelf) 1 Available 1U624179
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The potential for genetic improvement in nitrogen use efficiency (NUE) depends on the magnitude and nature of differences among varieties. The objective of this study was to evaluate NUE and its relationship to root system size in temperate maize genotypes. Twelve inbreds and ten hybrids were planted under two N levels (16 and 125 kg N ha-1) during 1993. Recognizing that root parameters may provide a partial explanation for differences in NUE, root system size was estimated using a portable capacitance meter. NUE differed significantly for inbreds and hybrids under both N treatments, with NUE under low N being roughly seven times greater than NUE under high N. In addition, there were wide differences in the genotypes' root system response to low N. No association was found between NUE and root system size as measured by capacitance. Thus, an increase in root system size would not appear to be an effective strategy for increased NUE.

English

9802|AGRIS 9702

Jose Juan Caballero

CIMMYT Publications Collection

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Centro Internacional de Mejoramiento de Maíz y Trigo (CIMMYT) © Copyright 2015. Carretera México-Veracruz. Km. 45, El Batán, Texcoco, México, C.P. 56237.
Si tiene cualquier pregunta, contáctenos a CIMMYT-Knowledge-Center@cgiar.org