Cryptochrome as a sensor of the blue - green ratio of natural radiation in Arabidopsis
Green light added to blue light has been proposed to shift cryptochromes from their semireduced active form to the reduced, inactive state. Whether the increased proportion of green light observed under leaf canopies compared to open places reduces cryptochrome-mediated effects remained to be elucid...
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| Formato: | Artículo |
| Lenguaje: | Español |
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| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2010Sellaro.pdf LINK AL EDITOR |
| Aporte de: | Registro referencial: Solicitar el recurso aquí |
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| 245 | 1 | 0 | |a Cryptochrome as a sensor of the blue - green ratio of natural radiation in Arabidopsis |
| 520 | |a Green light added to blue light has been proposed to shift cryptochromes from their semireduced active form to the reduced, inactive state. Whether the increased proportion of green light observed under leaf canopies compared to open places reduces cryptochrome-mediated effects remained to be elucidated. Here we report that the length of the hypocotyl of Arabidopsis [Arabidopsis thaliana] seedlings grown under controlled conditions decreased linearly with increasing blue/green ratios of the light within the range of ratios found in natural environments. This effect was stronger under higher irradiances. We developed a model, parameterized on the basis of field experiments including photoreceptor mutants, where hypocotyl growth of seedlings exposed to different natural radiation environments was related to the action and interaction of phytochromes and cryptochromes. Adding the blue/green ratio of the light in the term involving cryptochrome activity improved the goodness of fit of the model, thus supporting a role of the blue/green ratio under natural radiation. The blue/green ratio decreased sharply with increasing shade by green grass leaves to one-half of the values observed in open places. The impact of blue/green ratio on cryptochrome-mediated inhibition of hypocotyl growth was at least as large as that of irradiance. We conclude that cryptochrome is a sensor of blue irradiance and blue/green ratio. | ||
| 653 | 0 | |a CRYPTOCHROME | |
| 653 | 0 | |a PHYTOCHROME A | |
| 653 | 0 | |a PHYTOCHROME B | |
| 653 | 0 | |a ARABIDOPSIS | |
| 653 | 0 | |a BIOLOGICAL MODEL | |
| 653 | 0 | |a GROWTH, DEVELOPMENT AND AGING | |
| 653 | 0 | |a LIGHT | |
| 653 | 0 | |a METABOLISM | |
| 653 | 0 | |a PLANT GROWTH | |
| 653 | 0 | |a PLANT LEAF | |
| 653 | 0 | |a RADIATION EXPOSURE | |
| 653 | 0 | |a CRYPTOCHROMES | |
| 653 | 0 | |a HYPOCOTYL | |
| 653 | 0 | |a MODELS, BIOLOGICAL | |
| 653 | 0 | |a PLANT LEAVES | |
| 653 | 0 | |a ARABIDOPSIS THALIANA | |
| 700 | 1 | |9 67310 |a Sellaro, Romina | |
| 700 | 1 | |9 69990 |a Crepy, María A. | |
| 700 | 1 | |9 68567 |a Trupkin, Santiago Ariel | |
| 700 | 1 | |9 67481 |a Karayekov, Elizabeth | |
| 700 | 1 | |a Buchovsky, Ana Sabrina |9 71709 | |
| 700 | 1 | |a Rossi, Constanza |9 72067 | |
| 700 | 1 | |9 792 |a Casal, Jorge José | |
| 773 | |t Plant Physiology |g Vol.154, no.1 (2010), p.401-409 | ||
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| 900 | |a ^tCryptochrome as a sensor of the blue/green ratio of natural radiation in Arabidopsis | ||
| 900 | |a ^aSellaro^bR. | ||
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| 900 | |a ^aKarayekov^bE. | ||
| 900 | |a ^aBuchovsky^bA.S. | ||
| 900 | |a ^aRossi^bC. | ||
| 900 | |a ^aCasal^bJ.J. | ||
| 900 | |a ^aSellaro^bR. | ||
| 900 | |a ^aCrepy^bM. A. | ||
| 900 | |a ^aTrupkin^bS. A. | ||
| 900 | |a ^aKarayekov^bE. | ||
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| 900 | |a ^aCasal^bJ. J. | ||
| 900 | |a ^aSellaro^bR.^tIFEVA, Facultad de AgronomÃa, Universidad de Buenos Aires and Consejo Na. de Investigaciones CientÃficas y Técnicas, 1417 Buenos Aires, Argentina | ||
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| 900 | |a ^aBuchovsky^bA.S. | ||
| 900 | |a ^aRossi^bC. | ||
| 900 | |a ^aCasal^bJ.J. | ||
| 900 | |a ^tPlant Physiology^cPlant Physiol. | ||
| 900 | |a eng | ||
| 900 | |a 401 | ||
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| 900 | |a Vol. 154, no. 1 | ||
| 900 | |a 409 | ||
| 900 | |a CRYPTOCHROME | ||
| 900 | |a PHYTOCHROME A | ||
| 900 | |a PHYTOCHROME B | ||
| 900 | |a ARABIDOPSIS | ||
| 900 | |a BIOLOGICAL MODEL | ||
| 900 | |a GROWTH, DEVELOPMENT AND AGING | ||
| 900 | |a LIGHT | ||
| 900 | |a METABOLISM | ||
| 900 | |a PLANT GROWTH | ||
| 900 | |a PLANT LEAF | ||
| 900 | |a RADIATION EXPOSURE | ||
| 900 | |a CRYPTOCHROMES | ||
| 900 | |a HYPOCOTYL | ||
| 900 | |a MODELS, BIOLOGICAL | ||
| 900 | |a PLANT LEAVES | ||
| 900 | |a ARABIDOPSIS THALIANA | ||
| 900 | |a Green light added to blue light has been proposed to shift cryptochromes from their semireduced active form to the reduced, inactive state. Whether the increased proportion of green light observed under leaf canopies compared to open places reduces cryptochrome-mediated effects remained to be elucidated. Here we report that the length of the hypocotyl of Arabidopsis [Arabidopsis thaliana] seedlings grown under controlled conditions decreased linearly with increasing blue/green ratios of the light within the range of ratios found in natural environments. This effect was stronger under higher irradiances. We developed a model, parameterized on the basis of field experiments including photoreceptor mutants, where hypocotyl growth of seedlings exposed to different natural radiation environments was related to the action and interaction of phytochromes and cryptochromes. Adding the blue/green ratio of the light in the term involving cryptochrome activity improved the goodness of fit of the model, thus supporting a role of the blue/green ratio under natural radiation. The blue/green ratio decreased sharply with increasing shade by green grass leaves to one-half of the values observed in open places. The impact of blue/green ratio on cryptochrome-mediated inhibition of hypocotyl growth was at least as large as that of irradiance. We conclude that cryptochrome is a sensor of blue irradiance and blue/green ratio. | ||
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