Artículo
Genetic variation for wheat spike fertility in cultivars and early breeding materials
Fecha de publicación:
01/2016
Editorial:
Cambridge University Press
Revista:
Journal Of Agricultural Science
ISSN:
0021-8596
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Grain yield in bread wheat is often tightly associated with grain number/m2. In turn, spike fertility (SF), i.e., the quotient between grain number and spike chaff dry weight, accounts for a great proportion of the variation in grain number among cultivars. In order to examine the potential use of SF as a breeding target, (1) variation for the trait was assessed in six datasets combining commercial cultivars under different environmental conditions, (2) trait heritability was estimated in a set of F 1 hybrids derived from controlled crosses between cultivars with contrasting SF and (3) SF distribution pattern was analysed in two F 2 segregating populations. Analysis of commercial cultivars revealed considerable variation for SF, under both optimal and sub-optimal conditions. In addition, genotypic variation was consistently larger than genotype × environment interaction variation in all datasets. Narrow sense heritability, estimated by the mid-parent-offspring regression of 20 F 1 hybrids and their respective parents, was 0·63. Data from two F 2 populations exhibited bell-shaped and symmetric frequency distributions of SF, with a SF mean intermediate between the parental values. Substantial transgressive segregation was detected in both F 2 populations. In conclusion, SF appears to be a heritable trait with predominantly additive effects. This warrants further investigation on the feasibility of using SF as an early selection criterion in wheat breeding programs aimed at increasing grain yield.
Palabras clave:
GENETIC
,
WHEAT
,
FERTILITY
,
GRAIN YIELD
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Articulos(CCT - MAR DEL PLATA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - MAR DEL PLATA
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - MAR DEL PLATA
Citación
Mirabella, Nadia Estefania; Abbate, Pablo Eduardo; Ramirez, I. A.; Pontaroli, Ana; Genetic variation for wheat spike fertility in cultivars and early breeding materials; Cambridge University Press; Journal Of Agricultural Science; 154; 1; 1-2016; 13-22
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