Artículo
Artificial selection for grain yield has increased net CO2exchange of the ear leaf in maize crops
Cagnola, Juan Ignacio
; Parco, Martín; Rotili, Diego Hernán; Ploschuk, Edmundo Leonardo; Curin, Facundo
; Amás, Juan Ignacio
; Luque, Sergio Fernando; Maddonni, Gustavo Angel
; Otegui, Maria Elena
; Casal, Jorge José
Fecha de publicación:
05/2021
Editorial:
Oxford University Press
Revista:
Journal of Experimental Botany
ISSN:
0022-0957
e-ISSN:
1460-2431
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Identifying the physiological traits indirectly selected during the search for high-yielding maize hybrids is useful for guiding further improvements. To investigate such traits, in this study we focused on the critical period of kernel formation because kernel number is the main yield component affected by breeding. Our results show that breeding has increased the number of florets per ear and ear growth rate but not the vegetative shoot growth rate, suggesting localised effects around the ear. Consistent with this possibility, breeding has increased the net CO2 exchange of the ear leaf in field-grown crops grown at high population densities. This response is largely accounted for by increased light interception (which increases photosynthesis) and by reduced rates of respiration of the ear leaf in modern hybrids compared to older ones. Modern hybrids show increased ear-leaf area per unit leaf dry matter (specific leaf area), which accounts for the reduced respiratory load per unit leaf area. These observations are consistent with a model where the improved ear leaf CO2 exchange helps the additional florets produced by modern hybrids to survive the critical period of high susceptibility to stress and hence to produce kernels.
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Articulos de SEDE CENTRAL
Citación
Cagnola, Juan Ignacio; Parco, Martín; Rotili, Diego Hernán; Ploschuk, Edmundo Leonardo; Curin, Facundo; et al.; Artificial selection for grain yield has increased net CO2exchange of the ear leaf in maize crops; Oxford University Press; Journal of Experimental Botany; 72; 10; 5-2021; 3902-3913
Compartir
Altmétricas