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

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 respons...

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Detalles Bibliográficos
Otros Autores: Ugarte, Cristina Cecilia, Trupkin, Santiago Ariel, Ghiglione, Hernán, Slafer, Gustavo Ariel, Casal, Jorge José
Formato: Artículo
Lenguaje:Inglés
Materias:
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
Acceso en línea:http://ri.agro.uba.ar/files/download/articulo/2010Ugarte.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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245 1 0 |a Low red - far - red ratios delay spike and stem growth in wheat 
520 |a 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. 
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773 |t Journal of experimental botany  |g Vol.61, no.11 (2010), p.3151-3162 
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900 |a 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. 
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