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Caracterización fisiológica de cultivares tropicales de maíz en Venezuela

By: Cabrera de Bisbal, E | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico).
Contributor(s): Edmeades, G.O.|Banziger, M.|Mickelson, H.R.|Peña-Valdivia, C.B [eds.] | Nuñez, M.C [coaut.] | San Vicente, F.M [coaut.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: México, DF (México) CIMMYT : 1997ISBN: 968-6923-93-4.Subject(s): Crop management | Nitrogen fixation | Plant physiology | Plant production | Tropical zones | Venezuela | CIMMYT | Zea mays AGROVOC | Soil fertility AGROVOC | Nitrogen fertilizers AGROVOCDDC classification: 633.153 Summary: Nitrogen is one of the factors that frequently limits maize production in tropical areas. As a result, large quantities of nitrogenous fertilizer must be applied as a basic input in order to achieve satisfactory yields in the region. Nevertheless, it is difficult to sustain this crop management system over the long run, given the high costs of fertilizers. A study was undertaken of 15 tropical cultivars derived from the CENIAP-FONAIAP-Venezuela Maize Program to characterize a range of morpho-physiological traits associated with optimal and zero N use, thus obtaining basic information about the genetic potential of elite germplasm from the Venezuelan national program. The following traits were evaluated: biomass accumulation; specific foliar area; chlorophyll content; nitrogen reductase activity (ANR); and N absorption. Significant differences were detected (P < 0.05) among the cultivars for ANR and chlorophyll content. Under conditions of low N, the variation was between 1.6 and 7.1 mmol h-1 g-1 and 0.55 and mg g-1 Of ANR and chlorophyll, respectively, whereas under conditions of high N the variations were between 3.3 and 16.8 mmol h-1 g-1 and 1.17 and 2.53 mg g-1, respectively. The coefficient of correlation between ANR and biomass was r=0.71 (P < 0.05), and between ANR and N absorption was r=0.8 (P < 0.05). The results of this study can enhance the use of promising germplasm in a breeding program focused on developing maize that efficiently takes lip and uses N.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 1W624179
Total holds: 0

Nitrogen is one of the factors that frequently limits maize production in tropical areas. As a result, large quantities of nitrogenous fertilizer must be applied as a basic input in order to achieve satisfactory yields in the region. Nevertheless, it is difficult to sustain this crop management system over the long run, given the high costs of fertilizers. A study was undertaken of 15 tropical cultivars derived from the CENIAP-FONAIAP-Venezuela Maize Program to characterize a range of morpho-physiological traits associated with optimal and zero N use, thus obtaining basic information about the genetic potential of elite germplasm from the Venezuelan national program. The following traits were evaluated: biomass accumulation; specific foliar area; chlorophyll content; nitrogen reductase activity (ANR); and N absorption. Significant differences were detected (P < 0.05) among the cultivars for ANR and chlorophyll content. Under conditions of low N, the variation was between 1.6 and 7.1 mmol h-1 g-1 and 0.55 and mg g-1 Of ANR and chlorophyll, respectively, whereas under conditions of high N the variations were between 3.3 and 16.8 mmol h-1 g-1 and 1.17 and 2.53 mg g-1, respectively. The coefficient of correlation between ANR and biomass was r=0.71 (P < 0.05), and between ANR and N absorption was r=0.8 (P < 0.05). The results of this study can enhance the use of promising germplasm in a breeding program focused on developing maize that efficiently takes lip and uses N.

Global Maize Program

Spanish

9802|AGRIS 9702|anterior|R97-98PROCE|FINAL9798

Jose Juan Caballero

INT3035

CIMMYT Publications Collection

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