Knowledge Center Catalog

Breeding for N-stressed environments: How useful are low-N selection environments and secondary traits?

By: Contributor(s): Material type: TextTextPublication details: Mexico, DF (Mexico) CIMMYT : 1997ISBN:
  • 968-6923-93-4
Subject(s): DDC classification:
  • 633.153 EDM
Summary: The present study examines (i) to what extent alpha (0,1) lattice designs and secondary traits improve selection efficiency under low N, and (ii) whether selection under high N is an efficient approach for increasing grain yields under low N. Grain yield and the secondary traits anthesis-silking interval (ASI), number of ears per plant, leaf chlorophyll concentration and leaf senescence of 19 maize trials grown under low N and 14 under high N conditions were analyzed. Broad-sense heritabilities of traits, genetic correlations between environments and traits and predicted response to selection were calculated. The results indicate that (i) alpha (0,1) lattice designs and secondary traits can considerably increase the efficiency of selection for grain yield in maize breeding programs targeting low N environments, and that (ii) if the N stress present in the target environment leads to a yield reduction greater than about 40%, a breeding program should include low N selection environments in order to maximize selection gains for that target environment.
Tags from this library: No tags from this library for this title. Log in to add tags.
Star ratings
    Average rating: 0.0 (0 votes)

The present study examines (i) to what extent alpha (0,1) lattice designs and secondary traits improve selection efficiency under low N, and (ii) whether selection under high N is an efficient approach for increasing grain yields under low N. Grain yield and the secondary traits anthesis-silking interval (ASI), number of ears per plant, leaf chlorophyll concentration and leaf senescence of 19 maize trials grown under low N and 14 under high N conditions were analyzed. Broad-sense heritabilities of traits, genetic correlations between environments and traits and predicted response to selection were calculated. The results indicate that (i) alpha (0,1) lattice designs and secondary traits can considerably increase the efficiency of selection for grain yield in maize breeding programs targeting low N environments, and that (ii) if the N stress present in the target environment leads to a yield reduction greater than about 40%, a breeding program should include low N selection environments in order to maximize selection gains for that target environment.

Research and Partnership Program

English

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

Jose Juan Caballero

INT1888

CIMMYT Publications Collection


International Maize and Wheat Improvement Center (CIMMYT) © Copyright 2021.
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