Ontogenic evaluation of grain yield and time to maturity in barley

High grain yield and early maturity are desirable characteristics in many regions in which barley (Hordeum vulgare L.) is grown. However, negative correlation between these traits makes their joint improvement difficult. Previous research quantifying the contribution of traits to grain yield has not...

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Bibliographic Details
Published in:Agronomy journal 1997-07, Vol.89 (4)
Main Author: Dofing, S.M. (Palmer Res Ctr., Palmer, AK.)
Format: Article
Language:English
Subjects:
AGE
ALASKA
AMANDE DE LA GRAINE
CALOR
CHALEUR
CROP YIELD
CULTIVARS
DEVELOPMENTAL STAGES
EDAD
EPI
ESPIGAS
ETAPAS DE DESARROLLO
ETAPAS DE DESARROLLO DE LA PLANTA
FEUILLE
GENOTIPOS
GENOTYPE
GENOTYPES
GERMEN
GRAIN FILL RATE
HEAT
HEAT SUMS
HINCHAMIENTO DE LA SEMILLA
HOJAS
HORDEUM VULGARE
KERNELS
LEAVES
MADURACION
MATURATION
PERIODE VEGETATIVE
PERIODO VEGETATIVO
PHYLLOCHRON
PLANT DEVELOPMENTAL STAGES
PRECOCIDAD
PRECOCITE
PRECOCITY
REMPLISSAGE DU GRAIN
RENDEMENT DES CULTURES
RENDIMIENTO DE CULTIVOS
REPRODUCCION
REPRODUCTION
SEED FILLING
SPIKES
STADE DE DEVELOPPEMENT
STADE DE DEVELOPPEMENT VEGETAL
VARIEDADES
VARIETE
VARIETIES
VEGETATIVE PERIOD
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Description
Summary:High grain yield and early maturity are desirable characteristics in many regions in which barley (Hordeum vulgare L.) is grown. However, negative correlation between these traits makes their joint improvement difficult. Previous research quantifying the contribution of traits to grain yield has not included their effects on time to maturity, and often has not included important developmental traits related to time to maturity. The purpose of this research was to quantify the determination of grain yield and time to maturity in barley, using a model that included developmental traits such as leaf number, phyllochron, and grain fill rate. A genetically diverse group of 24 barley genotypes was grown for three years at Palmer, AK, and significant causal relationships determined using path analysis and stepwise regression. Longer vegetative periods (time to heading) resulted in higher grain yield, but longer heading-to-maturity periods had no effect on grain yield. Faster grain fill rate resulted in higher grain yield and shorter grain filling period. In environments similar to these, the competing objectives of high grain yield and acceptably early maturity were realized by cultivars with relatively long preheading periods and relatively short reproductive periods, without exceeding the critical level of early maturity required by growers. Longer preheading periods appear necessary to develop an adequate number of kernels per spike and sufficient number of leaves to provide photoassimilate during grain fill. These results provide breeders additional insights for decisions involving choice of germplasm and selection criteria in breeding programs
ISSN:0002-1962
1435-0645