info:eu-repo/semantics/article
Breeding effects on canopy light attenuation in maize: A retrospective and prospective analysis
Fecha
2021-12Registro en:
Lacasa, Josefina; Ciampitti, Ignacio Antonio; Amás, Juan Ignacio; Curin, Facundo; Luque, Sergio Fernando; et al.; Breeding effects on canopy light attenuation in maize: A retrospective and prospective analysis; Oxford University Press; Journal of Experimental Botany; 73; 5; 12-2021; 1301-1311
0022-0957
1460-2431
CONICET Digital
CONICET
Autor
Lacasa, Josefina
Ciampitti, Ignacio Antonio
Amás, Juan Ignacio
Curin, Facundo
Luque, Sergio Fernando
Otegui, Maria Elena
Resumen
The light attenuation process within a plant canopy defines energy capture and vertical distribution of light and nitrogen (N). The vertical light distribution can be quantitatively described with the extinction coefficient (k), which associates the fraction of intercepted photosynthetically active radiation (fPARi) with the leaf area index (LAI). Lower values of k correspond to upright leaves and homogeneous vertical light distribution, increasing radiation use efficiency (RUE). Yield gains in maize (Zea mays L.) were accompanied by increases in optimum plant density and leaf erectness. Thus, the yield-driven breeding programs and management changes, such as reduced row spacing, selected a more erect leaf habit under different maize production systems (e.g., China and the USA). In this study, data from Argentina revealed that k decreased at a rate of 1.1% year–1 since 1989, regardless of plant density and in agreement with Chinese reports (1.0% year–1 since 1981). A reliable assessment of changes in k over time is critical for predicting (i) modifications in resource use efficiency (e.g. radiation, water, and N), improving estimations derived from crop simulation models; (ii) differences in productivity caused by management practices; and (iii) limitations to further exploit this trait with breeding.