Normal view MARC view ISBD view

Maize landraces: Sources of tolerance to low soil nitrogen?

By: Lagarda Murrieta, R | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico).
Contributor(s): Edmeades, G.O [coaut.] | Edmeades, G.O.|Banziger, M.|Mickelson, H.R.|Peña-Valdivia, C.B [eds.] | Banziger, M.
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Mexico, DF (Mexico) CIMMYT : 1997ISBN: 968-6923-93-4.Subject(s): Nitrogen content | Nutrient uptake | Selection | Varieties | CIMMYT | Zea mays AGROVOC | Soil fertility AGROVOC | Genotypes AGROVOCDDC classification: 633.153 Summary: A total of 209 tropical maize accessions from the CIMMYT germplasm bank were evaluated over the course of three experiments to identify sources of tolerance to N deficiency. We measured grain yield, plant height and maturity under both high and low soil nitrogen. Under low N we also measured N uptake, N harvest index, ear leaf area, and ear leaf chlorophyll concentration. Maturity and season of evaluation had large effects, so results were analyzed separately for early and late landraces in winter and summer experiments. Landraces could be grouped using cluster analysis. Accessions from certain locations tended to have similar maturities. Some Cuban accessions were characterized by superior performance under low N. We identified 54 accessions with high total N recovery, harvest index, and grain %N, from various regions. These were grouped by maturity and intercrossed to form early and late source populations. After three cycles of intercrossing as half-sibs in a low-N nursery with very slight selection pressure for ear formation and reduced plant height, the populations underwent three additional cycles of improvement with 20-50% selection pressure for yield and plant type under low N. 171 two evaluations where N stress reduced mean yields to 1.05 t ha-1, yields of C6 of the source populations were not significantly less than the yields of improved check varieties. Yield of the early population increased by 15% per cycle between C4 and C6, and that increase was 11% per cycle in the late population. With continued improvement, these source populations may provide valuable traits for low N environments.Collection: CIMMYT Publications Collection
Tags from this library: No tags from this library for this title. Log in to add tags.
    average rating: 0.0 (0 votes)
Item type Current location Collection Call number Copy number Status Date due Barcode Item holds
Conference proceedings CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Publications Collection 633.153 EDM (Browse shelf) 1 Available 2I624179
Total holds: 0

A total of 209 tropical maize accessions from the CIMMYT germplasm bank were evaluated over the course of three experiments to identify sources of tolerance to N deficiency. We measured grain yield, plant height and maturity under both high and low soil nitrogen. Under low N we also measured N uptake, N harvest index, ear leaf area, and ear leaf chlorophyll concentration. Maturity and season of evaluation had large effects, so results were analyzed separately for early and late landraces in winter and summer experiments. Landraces could be grouped using cluster analysis. Accessions from certain locations tended to have similar maturities. Some Cuban accessions were characterized by superior performance under low N. We identified 54 accessions with high total N recovery, harvest index, and grain %N, from various regions. These were grouped by maturity and intercrossed to form early and late source populations. After three cycles of intercrossing as half-sibs in a low-N nursery with very slight selection pressure for ear formation and reduced plant height, the populations underwent three additional cycles of improvement with 20-50% selection pressure for yield and plant type under low N. 171 two evaluations where N stress reduced mean yields to 1.05 t ha-1, yields of C6 of the source populations were not significantly less than the yields of improved check varieties. Yield of the early population increased by 15% per cycle between C4 and C6, and that increase was 11% per cycle in the late population. With continued improvement, these source populations may provide valuable traits for low N environments.

Research and Partnership Program

English

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

Jose Juan Caballero

INT1888

CIMMYT Publications Collection

There are no comments for this item.

Log in to your account to post a comment.
baner

International Maize and Wheat Improvement Center (CIMMYT) © Copyright 2015. Carretera México-Veracruz. Km. 45, El Batán, Texcoco, México, C.P. 56237.
If you have any question, please contact us at CIMMYT-Knowledge-Center@cgiar.org

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