Abscisic acid regulates axillary bud outgrowth responses to the ratio of red to far - red light
Low red light/far-red light ratio [R:FR] serves as an indicator of impending competition and has been demonstrated to suppress branch development. The regulation of Arabidopsis [Arabidopsis thaliana] rosette bud outgrowth by the R:FR and the associated mechanisms were investigated at several levels....
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| Formato: | Artículo |
| Lenguaje: | Español |
| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2013reddy.pdf LINK AL EDITOR |
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| 245 | 1 | 0 | |a Abscisic acid regulates axillary bud outgrowth responses to the ratio of red to far - red light |
| 520 | |a Low red light/far-red light ratio [R:FR] serves as an indicator of impending competition and has been demonstrated to suppress branch development. The regulation of Arabidopsis [Arabidopsis thaliana] rosette bud outgrowth by the R:FR and the associated mechanisms were investigated at several levels. Growth under low R:FR suppressed outgrowth of the third from topmost bud [bud n-2] but not that of the topmost bud. Subsequently increasing the R:FR near the time of anthesis promoted bud n-2 outgrowth and reduced topmost bud growth. Buds from specific rosette positions, exhibiting divergent fates to increased R:FR, were harvested 3 h after modifying the R:FR and were used to conduct ATH1 microarray-based transcriptome profiling. Differentially expressed genes showed enrichment of light signaling and hormone-related Gene Ontology terms and promoter motifs, most notably those associated with abscisic acid [ABA]. Genes associated with ABA biosynthesis, including the key biosynthetic gene NINE-CIS-EPOXYCAROTENOID DIOXYGENASE3 [NCED3], and with ABA signaling were expressed at higher levels in the responsive bud n-2, and increasing the R:FR decreased their expression only in bud n-2. ABA abundance in responsive buds decreased within 12 h of increasing the R:FR, while indole-3-acetic acid levels did not change. A role for ABA in repressing bud outgrowth from lower positions under low R:FR was demonstrated using the nced3-2 and aba2-1 ABA biosynthesis mutants, which showed enhanced branching and a defective bud n-2 outgrowth response to low R:FR. The results provide evidence that ABA regulates bud outgrowth responses to the R:FR and thus extend the known hormonal pathways associated with the regulation of branching and shade avoidance. | ||
| 700 | 1 | |a Reddy, Srirama Krishna |9 71644 | |
| 700 | 1 | |a Holalu, Srinidhi V. |9 71645 | |
| 700 | 1 | |9 792 |a Casal, Jorge José | |
| 700 | 1 | |a Finlayson, Scott A. |9 70211 | |
| 773 | |t Plant Physiology |g vol.163, no.2 (2013), p.1047-1058 | ||
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| 900 | |a ^tAbscisic acid regulates axillary bud outgrowth responses to the ratio of red to far-red light | ||
| 900 | |a ^aReddy^bS.K. | ||
| 900 | |a ^aHolalu^bS.V. | ||
| 900 | |a ^aCasal^bJ.J. | ||
| 900 | |a ^aFinlayson^bS.A. | ||
| 900 | |a ^aReddy^bS. K. | ||
| 900 | |a ^aHolalu^bS. V. | ||
| 900 | |a ^aCasal^bJ. J. | ||
| 900 | |a ^aFinlayson^bS. A. | ||
| 900 | |a ^aReddy^bS.K.^tDepartment of Soil and Crop Sciences, Texas A and M University and Texas A and M AgriLife Research, College Station, TX 77843, United States | ||
| 900 | |a ^aHolalu^bS.V^tDepartment of Soil and Crop Sciences, Texas A and M University and Texas A and M AgriLife Research, College Station, TX 77843, United States | ||
| 900 | |a ^aHolalu^bS.V.^tFaculty of Molecular and Environmental Plant Sciences, Texas A and M University, College Station, TX 77843, United States | ||
| 900 | |a ^aCasal^bJ.J.^tInstituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura, Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, 1417 Buenos Aires, Argentina | ||
| 900 | |a ^aCasal^bJ.J.^tFundación Instituto Leloir, Instituto de Investigaciones Bioquimicas, Buenos Aires-Consejo Nacional de Investigaciones Científicas y Técnicas, 1405 Buenos Aires, Argentina | ||
| 900 | |a ^aFinlayson^bS.A.^t^tDepartment of Soil and Crop Sciences, Texas A and M University and Texas A and M AgriLife Research, College Station, TX 77843, United States | ||
| 900 | |a ^aFinlayson^bS.A.^tFaculty of Molecular and Environmental Plant Sciences, Texas A and M University, College Station, TX 77843, United States | ||
| 900 | |a ^tPlant Physiology^cPlant Physiol. | ||
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| 900 | |a 1047 | ||
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| 900 | |a Vol. 163, no. 2 | ||
| 900 | |a 1058 | ||
| 900 | |a Low red light/far-red light ratio [R:FR] serves as an indicator of impending competition and has been demonstrated to suppress branch development. The regulation of Arabidopsis [Arabidopsis thaliana] rosette bud outgrowth by the R:FR and the associated mechanisms were investigated at several levels. Growth under low R:FR suppressed outgrowth of the third from topmost bud [bud n-2] but not that of the topmost bud. Subsequently increasing the R:FR near the time of anthesis promoted bud n-2 outgrowth and reduced topmost bud growth. Buds from specific rosette positions, exhibiting divergent fates to increased R:FR, were harvested 3 h after modifying the R:FR and were used to conduct ATH1 microarray-based transcriptome profiling. Differentially expressed genes showed enrichment of light signaling and hormone-related Gene Ontology terms and promoter motifs, most notably those associated with abscisic acid [ABA]. Genes associated with ABA biosynthesis, including the key biosynthetic gene NINE-CIS-EPOXYCAROTENOID DIOXYGENASE3 [NCED3], and with ABA signaling were expressed at higher levels in the responsive bud n-2, and increasing the R:FR decreased their expression only in bud n-2. ABA abundance in responsive buds decreased within 12 h of increasing the R:FR, while indole-3-acetic acid levels did not change. A role for ABA in repressing bud outgrowth from lower positions under low R:FR was demonstrated using the nced3-2 and aba2-1 ABA biosynthesis mutants, which showed enhanced branching and a defective bud n-2 outgrowth response to low R:FR. The results provide evidence that ABA regulates bud outgrowth responses to the R:FR and thus extend the known hormonal pathways associated with the regulation of branching and shade avoidance. | ||
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