Low red/far-red ratios delay spike and stem growth in wheat

• Autores: Ugarte, Cristina Cecilia; Trupkin, Santiago Ariel; Ghiglione, Hernán; Slafer, Gustavo Ariel; Casal, Jorge José
• Año de publicación: 2010
• Idioma: inglés
• Tipo de recurso: artículo
• Fuente: Journal of experimental botany; Vol.61, no.11; 3151-3162; https://academic.oup.com/jxb
• Materia: VEGETABLE PROTEIN; GENE EXPRESSION REGULATION; GENETICS; GROWTH, DEVELOPMENT AND AGING; LIGHT; METABOLISM; PLANT STEM; RADIATION EXPOSURE; WHEAT; GENE EXPRESSION REGULATION, DEVELOPMENTAL; GENE EXPRESSION REGULATION, PLANT; PLANT PROTEINS; PLANT STEMS; TRITICUM
• Institución: Universidad de Buenos Aires. Facultad de Agronomía

Fil: Ugarte, Cristina Cecilia. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Ugarte, Cristina Cecilia. CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Trupkin, Santiago Ariel. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Trupkin, Santiago Ariel. CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Ghiglione, Hernán. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Ghiglione, Hernán. CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Slafer, Gustavo Ariel. ICREA (Catalonian Institution for Research and Advanced Studies) and Department of Crop and Forest Sciences, University of Lleida, Centre Udl-IRTA. Lleida, Spain.
Fil: Casal, Jorge José. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Casal, Jorge José. CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
The responses to low red light/far-red light (R/FR) ratios simulating dense stands were evaluated in wheat (Triticum aestivum L) cultivars released at different times in the 20th century and consequently resulting from an increasingly prolonged breeding and selection history. While tillering responses to the R/FR ratio were unaffected by the cultivars, low R/FR ratios reduced grain yield per plant (primarily grain number and secondarily grain weight per plant) particularly in modern cultivars. Low R/FR ratios delayed spike growth and development, reduced the expression of spike marker genes, accelerated the development of florets already initiated, and reduced the number of fertile florets at anthesis. It is noteworthy that low R/FR ratios did not promote stem or leaf sheath growth and therefore the observed reduction of yield cannot be accounted for as a consequence of divergence of resources towards increased plant stature. It is proposed that the regulation of yield components by the R/FR ratio could help plants to adjust to the limited availability of resources under crop conditions.