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Lacasa J, Ciampitti IA, Amas JI, et al. Breeding effects on canopy light attenuation in maize: a retrospective and prospective analysis. J Exp Bot. 2021;doi: 10.1093/jxb/erab503.
Lacasa, J., Ciampitti, I. A., Amas, J. I., Curín, F., Luque, S. F., & Otegui, M. E. (2021). Breeding effects on canopy light attenuation in maize: a retrospective and prospective analysis. Journal of experimental botany, . https://doi.org/10.1093/jxb/erab503
Lacasa, Josefina, et al. "Breeding effects on canopy light attenuation in maize: a retrospective and prospective analysis." Journal of experimental botany vol. (2021). doi: https://doi.org/10.1093/jxb/erab503
Lacasa J, Ciampitti IA, Amas JI, Curín F, Luque SF, Otegui ME. Breeding effects on canopy light attenuation in maize: a retrospective and prospective analysis. J Exp Bot. 2021 Dec 23; doi: 10.1093/jxb/erab503. Epub 2021 Dec 23. PMID: 34939088.
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J Exp Bot. 2021 Dec 23; doi: 10.1093/jxb/erab503. Epub 2021 Dec 23.

Breeding effects on canopy light attenuation in maize: a retrospective and prospective analysis.

Journal of experimental botany

Josefina Lacasa, Ignacio A Ciampitti, Juan I Amas, Facundo Curín, Sergio F Luque, María E Otegui

Affiliations

  1. Department of Agronomy, Kansas State University, Throckmorton Plant Science Center, Manhattan, Kansas, United States.
  2. Dpto. de Producción Vegetal, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín (C1417DSE), Ciudad de Buenos Aires, Argentina.
  3. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) en INTA, Centro Regional Buenos Aires Norte, Estación Experimental Agropecuaria, Ruta, Pergamino (C2700), Provincia de Buenos Aires, Argentina.
  4. Centro de Investigaciones y Transferencia del noroeste de la Provincia de Buenos Aires (CIT-NOBA-CONICET), Argentina.
  5. Cátedra de Cereales y Oleaginosas, Facultad de Ciencias Agropecuarias, Universidad Nacional de Córdoba, Córdoba, Argentina.

PMID: 34939088 DOI: 10.1093/jxb/erab503

Abstract

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 United States). 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, nitrogen), improving estimations derived from crop simulation models, (ii) differences in productivity caused by management practices, (iii) limitations to further exploit this trait with breeding.

© The Author(s) 2021. Published by Oxford University Press on behalf of the Society for Experimental Biology. All rights reserved. For permissions, please email: [email protected].

Keywords: Zea mays L; breeding; canopy design; corn; light extinction coefficient; light interception; nitrogen distribution; photosynthesis; radiation; yield gains

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