Genetic improvement of bread wheat yield and associated traits in Spain during the 20th century
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Fecha de publicación
2012-04-17ISSN
0021-8596
Resumen
A collection of 26 wheat genotypes widely grown in Spain during the 20th century was evaluated in eight
contrasting environments in order to quantify breeding achievements in yield and associated traits. From 1930 to
2000, yield increased at a rate of 35·1 kg/ha/yr or 0·88%/yr, but estimations of relative genetic gain (RGG) were
environment-dependent. RGG estimated for yield were positively associated with the average minimum daily
temperatures from sowing to heading in the testing environments (R2=0·81; P<0·01). The number of grains/spike
and the number of spikes/m2 increased at a rate of 0·60%/yr and 0·30%/yr, respectively, while grain weight
remained unchanged. The present study detected two main episodes of yield improvement during the century.
The first one coincided with the introduction, during the 1950s, of the first improved cultivars derived from intraspecific crosses, which increased the yield of landraces by 30% due to an increase of c. 58% in the number of
grains/spike, accompanied by a 16% reduction in grain weight. These initial cultivars (termed ‘old-bred’ in a
previous study by Sanchez-Garcia et al. 2012) exhibited a higher harvest index (HI), increased from 0·25 to 0·40,
but maintained the same aboveground biomass at maturity as the landraces (despite reducing both plant height
and the number of tillers/plant) due to increases in the proportion of tillers bearing spikes. The second yield gain
occurred after the introduction, in the early 1970s, of semi-dwarf germplasm from CIMMYT (International Maize
and Wheat Improvement Centre) and some French cultivars. This new germplasm further reduced plant height,
improved HI up to 0·45 and increased the number of tillers/plant while maintaining their rate of fertility, thus
resulting in a yield gain of c. 37%. The cultivars released during the last decade of the century did not contribute to
significant yield improvements.
Tipo de documento
Artículo
Versión del documento
Versión publicada
Lengua
Inglés
Materias (CDU)
633 - Cultivos y producciones
Páginas
14
Publicado por
Cambridge University Press
Publicado en
Journal of Agricultural Science
Citación
Sánchez-García, Miguel, C. Royo, Nieves Aparicio, J. A. Martín-Sánchez, and Fanny Álvaro. 2012. “Genetic Improvement of Bread Wheat Yield and Associated Traits in Spain During the 20th Century.” Journal of Agricultural Science 151 (1): 105–118. doi:10.1017/s0021859612000330
Número del acuerdo de la subvención
INIA/ /RTA2004-00058-C04/ES/ /
INIA/Programa Nacional de Proyectos de Investigación Fundamental/RTA2009-00061-C03/ES/Mejora genética de trigo para la obtención de variedades de interés agroindustrial adaptadas a las condiciones españolas/
MICINN/Programa Nacional de Proyectos de Investigación Fundamental/AGL2009-11187/ES/Componentes De Tolerancia A La Sequia E Impacto En Mejora De Trigo: Bases Genetica Y Molecular Del Contenido De Chl/
Program
Cultius Extensius Sostenibles
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