Arabidopsis thaliana life without phytochromes

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Plants use light as a source of energy for photosynthesis and as a source of environmental information perceived by photoreceptors. Testing whether plants can complete their cycle if light provides energy but no information about the environment requires a plant devoid of phytochromes because all ph...

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Detalles Bibliográficos
Otros Autores: Strasser, Bárbara, Sanchez Lamas, Maximiliano, Yanovsky, Marcelo J., Casal, Jorge José, Cerdán, Pablo D.
Formato: Artículo
Lenguaje:Inglés
Materias:
CLOCK
CRYPTOCHROME
PHYTOCHROME
BLUE LIGHT
COTYLEDON
FLOWERING
LIFE CYCLE
NONHUMAN
PHOTORECEPTOR
PHOTOSYNTHESIS
PLANT
RED LIGHT
SEEDLING
SENESCENCE
WHITE LIGHT
ARABIDOPSIS
ARABIDOPSIS PROTEINS
CHLOROPHYLL
CIRCADIAN RHYTHM
GERMINATION
GIBBERELLINS
LIGHT
MORPHOGENESIS
MUTATION
PHOTOTROPISM
PLANT GROWTH REGULATORS
PLANT LEAVES
SEEDS
ARABIDOPSIS THALIANA
Acceso en línea:http://ri.agro.uba.ar/files/download/articulo/2010Strasser.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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520 |a Plants use light as a source of energy for photosynthesis and as a source of environmental information perceived by photoreceptors. Testing whether plants can complete their cycle if light provides energy but no information about the environment requires a plant devoid of phytochromes because all photosynthetically active wavelengths activate phytochromes. Producing such a quintuple mutant of Arabidopsis thaliana has been challenging, but we were able to obtain it in the flowering locus T [ft] mutant background. The quintuple phytochrome mutant does not germinate in the FT background, but it germinates to some extent in the ft background. If germination problems are bypassed by the addition of gibberellins, the seedlings of the quintuple phytochrome mutant exposed to red light produce chlorophyll, indicating that phytochromes are not the sole redlight photoreceptors, but they become developmentally arrested shortly after the cotyledon stage. Blue light bypasses this blockage, rejecting the long-standing idea that the blue-light receptors cryptochromes cannot operate without phytochromes. After growth under white light, returning the quintuple phytochrome mutant to red light resulted in rapid senescence of already expanded leaves and severely impaired expansion of new leaves. We conclude that Arabidopsis development is stalled at several points in the presence of light suitable for photosynthesis but providing no photomorphogenic signal. 
653 0 |a CLOCK 
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653 0 |a PLANT 
653 0 |a RED LIGHT 
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653 0 |a ARABIDOPSIS 
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653 0 |a LIGHT 
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653 0 |a MUTATION 
653 0 |a PHOTOTROPISM 
653 0 |a PHYTOCHROME 
653 0 |a PLANT GROWTH REGULATORS 
653 0 |a PLANT LEAVES 
653 0 |a SEEDLING 
653 0 |a SEEDS 
653 0 |a ARABIDOPSIS THALIANA 
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700 1 |9 69636  |a Cerdán, Pablo D. 
773 |t Proceedings of the National Academy of Sciences of the United States of America  |g Vol.107, no.10 (2010), p.4776-4781 
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900 |a ^aStrasser^bB.^tFundación Instituto Leloir, Inst. de Invest. Bioquimicas de Buenos Aires-Consejo Nac. de Invest. Cientificas Y Téc., Universidad de Buenos Aires, C1405BWE Buenos Aires, Argentina 
900 |a ^aSánchez-Lamas^bM.^tInstituto de Investigaciones Fisiológicas Y Ecológicas Vinculadas a la Agricultura, Facultad de Agronomía, Universidad de Buenos Aires and Consejo Nacional de Investigaciones Cientificas Y Técnicas, 1417 Buenos Aires, Argentina 
900 |a ^aYanovsky^bM.J. 
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900 |a CRYPTOCHROME 
900 |a PHYTOCHROME 
900 |a BLUE LIGHT 
900 |a COTYLEDON 
900 |a FLOWERING 
900 |a LIFE CYCLE 
900 |a NONHUMAN 
900 |a PHOTORECEPTOR 
900 |a PHOTOSYNTHESIS 
900 |a PLANT 
900 |a RED LIGHT 
900 |a SEEDLING 
900 |a SENESCENCE 
900 |a WHITE LIGHT 
900 |a ARABIDOPSIS 
900 |a ARABIDOPSIS PROTEINS 
900 |a CHLOROPHYLL 
900 |a CIRCADIAN RHYTHM 
900 |a GERMINATION 
900 |a GIBBERELLINS 
900 |a LIGHT 
900 |a MORPHOGENESIS 
900 |a MUTATION 
900 |a PHOTOTROPISM 
900 |a PHYTOCHROME 
900 |a PLANT GROWTH REGULATORS 
900 |a PLANT LEAVES 
900 |a SEEDLING 
900 |a SEEDS 
900 |a ARABIDOPSIS THALIANA 
900 |a Plants use light as a source of energy for photosynthesis and as a source of environmental information perceived by photoreceptors. Testing whether plants can complete their cycle if light provides energy but no information about the environment requires a plant devoid of phytochromes because all photosynthetically active wavelengths activate phytochromes. Producing such a quintuple mutant of Arabidopsis thaliana has been challenging, but we were able to obtain it in the flowering locus T [ft] mutant background. The quintuple phytochrome mutant does not germinate in the FT background, but it germinates to some extent in the ft background. If germination problems are bypassed by the addition of gibberellins, the seedlings of the quintuple phytochrome mutant exposed to red light produce chlorophyll, indicating that phytochromes are not the sole redlight photoreceptors, but they become developmentally arrested shortly after the cotyledon stage. Blue light bypasses this blockage, rejecting the long-standing idea that the blue-light receptors cryptochromes cannot operate without phytochromes. After growth under white light, returning the quintuple phytochrome mutant to red light resulted in rapid senescence of already expanded leaves and severely impaired expansion of new leaves. We conclude that Arabidopsis development is stalled at several points in the presence of light suitable for photosynthesis but providing no photomorphogenic signal. 
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