New Arabidopsis recombinant inbred lines (Landsberg erecta x Nossen) reveal natural variation in phytochrome-mediated responses

We used 52 Arabidopsis (Arabidopsis thaliana) accessions and developed a new set of 137 recombinant inbred lines between Landsberg erecta (Ler) and Nossen (No-0) to explore the genetic basis of phytochrome-mediated responses during deetiolation. Unexpectedly, most accessions showed weak or moderate...

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Autores principales: Alconada Magliano, Teresa M., Botto, Javier F., Godoy, A. Veronica, Symonds, V. Vaughan, Lloyd, Alan M., Casal, Jorge J.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2005
Materias:
Bioquímica
Arabidopsis
phytochrome
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83276
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83276
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Bioquímica
Arabidopsis
phytochrome
spellingShingle Bioquímica
Arabidopsis
phytochrome
Alconada Magliano, Teresa M.
Botto, Javier F.
Godoy, A. Veronica
Symonds, V. Vaughan
Lloyd, Alan M.
Casal, Jorge J.
New Arabidopsis recombinant inbred lines (Landsberg erecta x Nossen) reveal natural variation in phytochrome-mediated responses
topic_facet Bioquímica
Arabidopsis
phytochrome
description We used 52 Arabidopsis (Arabidopsis thaliana) accessions and developed a new set of 137 recombinant inbred lines between Landsberg erecta (Ler) and Nossen (No-0) to explore the genetic basis of phytochrome-mediated responses during deetiolation. Unexpectedly, most accessions showed weak or moderate hypocotyl growth and cotyledon unfolding responses to pulses of far-red light (FR). Crosses between Columbia and No-0, two accessions with poor response, segregated seedlings with unfolded cotyledons under pulsed FR, suggesting the occurrence of accession-specific loci in the repression of morphological responses to weak light signals. Confirming the latter expectation, mapping of responses to pulsed FR in the Ler x No-0 lines identified novel loci. Despite its weak response to pulsed FR, No-0 showed a response to continuous FR stronger than that observed in Ler. By mapping the differential effect of pulsed versus continuous FR, we identified two high-irradiance response loci that account for the steeper response to continuous FR in No-0. This underscores the potential of the methodology to identify loci involved in the regulation of the shape of signal input-output relationships. Loci specific for a given phytochrome-mediated response were more frequent than pleiotropic loci. Segregation of these specific loci is predicted to yield different combinations of seedling responsivity to light. Such flexibility in combination of responses is observed among accessions and could aid in the adjustment to different microenvironments.
format Articulo
Articulo
author Alconada Magliano, Teresa M.
Botto, Javier F.
Godoy, A. Veronica
Symonds, V. Vaughan
Lloyd, Alan M.
Casal, Jorge J.
author_facet Alconada Magliano, Teresa M.
Botto, Javier F.
Godoy, A. Veronica
Symonds, V. Vaughan
Lloyd, Alan M.
Casal, Jorge J.
author_sort Alconada Magliano, Teresa M.
title New Arabidopsis recombinant inbred lines (Landsberg erecta x Nossen) reveal natural variation in phytochrome-mediated responses
title_short New Arabidopsis recombinant inbred lines (Landsberg erecta x Nossen) reveal natural variation in phytochrome-mediated responses
title_full New Arabidopsis recombinant inbred lines (Landsberg erecta x Nossen) reveal natural variation in phytochrome-mediated responses
title_fullStr New Arabidopsis recombinant inbred lines (Landsberg erecta x Nossen) reveal natural variation in phytochrome-mediated responses
title_full_unstemmed New Arabidopsis recombinant inbred lines (Landsberg erecta x Nossen) reveal natural variation in phytochrome-mediated responses
title_sort new arabidopsis recombinant inbred lines (landsberg erecta x nossen) reveal natural variation in phytochrome-mediated responses
publishDate 2005
url http://sedici.unlp.edu.ar/handle/10915/83276
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