Growth responses of Betula pendula ecotypes to red and far-red light

The effect of Red light (R), Far-red light (FR) and R/FR combinations on shoot growth of latitudinal ecotypes of B. pendula was studied using special diodes that emit monochromatic lights. When a 12 hrs PAR (110 µmol m-2 s-1) was extended with R, FR or R/FR ratios, lower intensities of mon...

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Autores principales:	Tsegay,Berhanu A., Lund,Leidulf, Nilsen,Jarle, Olsen,Jorunn E., Molmann,Jorgen M., Ernsten,Arild, Juntttila,Olavi
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso 2005
Materias:	diode ecotype monochromatic photomorphogenesis phytochrome photosynthetically active radiation PAR
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000100005
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spelling	oai:scielo:S0717-345820050001000052005-08-17Growth responses of Betula pendula ecotypes to red and far-red lightTsegay,Berhanu A.Lund,LeidulfNilsen,JarleOlsen,Jorunn E.Molmann,Jorgen M.Ernsten,ArildJuntttila,Olavi diode ecotype monochromatic photomorphogenesis phytochrome photosynthetically active radiation PAR The effect of Red light (R), Far-red light (FR) and R/FR combinations on shoot growth of latitudinal ecotypes of B. pendula was studied using special diodes that emit monochromatic lights. When a 12 hrs PAR (110 µmol m-2 s-1) was extended with R, FR or R/FR ratios, lower intensities of monochromatic lights could not prevent growth cessation. At 25 µmol m-2 s-1, FR compared to R enhanced stem elongation in all ecotypes. This was due to the inhibitive effect of R on internode elongation. When day-length was extended by R/FR at various ratios, there was continuous shoot elongation, but was found to be declining with increasing ratios. The more the R, the shorter were the internodes of each plant. B. pendula ecotypes produced branches when PAR light during the day was extended by incandescent light, but did not do so when the light extensions were made by monochromatic R or FR or their combination. Branching increased with decreasing latitude of the ecotypeinfo:eu-repo/semantics/openAccessPontificia Universidad Católica de ValparaísoElectronic Journal of Biotechnology v.8 n.1 20052005-04-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000100005en
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	diode ecotype monochromatic photomorphogenesis phytochrome photosynthetically active radiation PAR
spellingShingle	diode ecotype monochromatic photomorphogenesis phytochrome photosynthetically active radiation PAR Tsegay,Berhanu A. Lund,Leidulf Nilsen,Jarle Olsen,Jorunn E. Molmann,Jorgen M. Ernsten,Arild Juntttila,Olavi Growth responses of Betula pendula ecotypes to red and far-red light
description	The effect of Red light (R), Far-red light (FR) and R/FR combinations on shoot growth of latitudinal ecotypes of B. pendula was studied using special diodes that emit monochromatic lights. When a 12 hrs PAR (110 µmol m-2 s-1) was extended with R, FR or R/FR ratios, lower intensities of monochromatic lights could not prevent growth cessation. At 25 µmol m-2 s-1, FR compared to R enhanced stem elongation in all ecotypes. This was due to the inhibitive effect of R on internode elongation. When day-length was extended by R/FR at various ratios, there was continuous shoot elongation, but was found to be declining with increasing ratios. The more the R, the shorter were the internodes of each plant. B. pendula ecotypes produced branches when PAR light during the day was extended by incandescent light, but did not do so when the light extensions were made by monochromatic R or FR or their combination. Branching increased with decreasing latitude of the ecotype
author	Tsegay,Berhanu A. Lund,Leidulf Nilsen,Jarle Olsen,Jorunn E. Molmann,Jorgen M. Ernsten,Arild Juntttila,Olavi
author_facet	Tsegay,Berhanu A. Lund,Leidulf Nilsen,Jarle Olsen,Jorunn E. Molmann,Jorgen M. Ernsten,Arild Juntttila,Olavi
author_sort	Tsegay,Berhanu A.
title	Growth responses of Betula pendula ecotypes to red and far-red light
title_short	Growth responses of Betula pendula ecotypes to red and far-red light
title_full	Growth responses of Betula pendula ecotypes to red and far-red light
title_fullStr	Growth responses of Betula pendula ecotypes to red and far-red light
title_full_unstemmed	Growth responses of Betula pendula ecotypes to red and far-red light
title_sort	growth responses of betula pendula ecotypes to red and far-red light
publisher	Pontificia Universidad Católica de Valparaíso
publishDate	2005
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000100005
work_keys_str_mv	AT tsegayberhanua growthresponsesofbetulapendulaecotypestoredandfarredlight AT lundleidulf growthresponsesofbetulapendulaecotypestoredandfarredlight AT nilsenjarle growthresponsesofbetulapendulaecotypestoredandfarredlight AT olsenjorunne growthresponsesofbetulapendulaecotypestoredandfarredlight AT molmannjorgenm growthresponsesofbetulapendulaecotypestoredandfarredlight AT ernstenarild growthresponsesofbetulapendulaecotypestoredandfarredlight AT juntttilaolavi growthresponsesofbetulapendulaecotypestoredandfarredlight
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Growth responses of Betula pendula ecotypes to red and far-red light

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