Jasmonate - dependent and - independent pathways mediate specific effects of solar ultraviolet B radiation on leaf phenolics and antiherbivore defense
Ultraviolet B [UV-B] radiation, a very small fraction of the daylight spectrum, elicits changes in plant secondary metabolism that have large effects on plant-insect interactions. The signal transduction pathways that mediate these specific effects of solar UV-B are not known. We examined the role o...
| Otros Autores: | , , , |
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| Formato: | Artículo |
| Lenguaje: | Español |
| Materias: | |
| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2010Demkura.pdf LINK AL EDITOR |
| Aporte de: | Registro referencial: Solicitar el recurso aquí |
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| 245 | 1 | 0 | |a Jasmonate - dependent and - independent pathways mediate specific effects of solar ultraviolet B radiation on leaf phenolics and antiherbivore defense |
| 520 | |a Ultraviolet B [UV-B] radiation, a very small fraction of the daylight spectrum, elicits changes in plant secondary metabolism that have large effects on plant-insect interactions. The signal transduction pathways that mediate these specific effects of solar UV-B are not known. We examined the role of jasmonate signaling by measuring responses to UV-B in wild-type and transgenic jasmonate-deficient Nicotiana attenuata plants in which a lipoxygenase gene [NaLOX3] was silenced [as-lox]. In wild-type plants, UV-B failed to elicit the accumulation of jasmonic acid [JA] or the bioactive JA-isoleucine conjugate but amplified the response of jasmonate-inducible genes, such as trypsin proteinase inhibitor [TPI], to wounding and methyl jasmonate, and increased the accumulation of several phenylpropanoid derivatives. Some of these phenolic responses [accumulation of caffeoyl-polyamine conjugates] were completely lacking in as-lox plants, whereas others [accumulation of rutin and chlorogenic acid] were similar in both genotypes. In open field conditions, as-lox plants received more insect damage than wild-type plants, as expected, but the dramatic increase in resistance to herbivory elicited by UV-B exposure, which was highly significant in wild-type plants, did not occur in as-lox plants. We conclude that solar UV-B [1] uses jasmonate-dependent and -independent pathways in the elicitation of phenolic compounds, and [2] increases sensitivity to jasmonates, leading to enhanced expression of wound-response genes [TPI]. The lack of UV-B-induced antiherbivore protection in as-lox plants suggests that jasmonate signaling plays a central role in the mechanisms by which solar UV-B increases resistance to insect herbivores in the field. | ||
| 653 | 0 | |a ACETIC ACID DERIVATIVE | |
| 653 | 0 | |a CYCLOPENTANE DERIVATIVE | |
| 653 | 0 | |a JASMONIC ACID | |
| 653 | 0 | |a JASMONIC ACID METHYL ESTER | |
| 653 | 0 | |a OXYLIPIN | |
| 653 | 0 | |a PHENOL DERIVATIVE | |
| 653 | 0 | |a GENE SILENCING | |
| 653 | 0 | |a GENETICS | |
| 653 | 0 | |a METABOLISM | |
| 653 | 0 | |a PLANT LEAF | |
| 653 | 0 | |a RADIATION EXPOSURE | |
| 653 | 0 | |a SIGNAL TRANSDUCTION | |
| 653 | 0 | |a SUNLIGHT | |
| 653 | 0 | |a TOBACCO | |
| 653 | 0 | |a TRANSGENIC PLANT | |
| 653 | 0 | |a ULTRAVIOLET RADIATION | |
| 653 | 0 | |a ACETIC ACIDS | |
| 653 | 0 | |a ANIMALS | |
| 653 | 0 | |a CYCLOPENTANES | |
| 653 | 0 | |a INSECTS | |
| 653 | 0 | |a OXYLIPINS | |
| 653 | 0 | |a PHENOLS | |
| 653 | 0 | |a PLANT LEAVES | |
| 653 | 0 | |a PLANTS, GENETICALLY MODIFIED | |
| 653 | 0 | |a ULTRAVIOLET RAYS | |
| 653 | 0 | |a HEXAPODA | |
| 653 | 0 | |a NICOTIANA ATTENUATA | |
| 700 | 1 | |9 35030 |a Demkura, Patricia Verónica | |
| 700 | 1 | |a Abdala, Guillermina I. |9 69871 | |
| 700 | 1 | |a Baldwin, Ian T. |9 67331 | |
| 700 | 1 | |9 672 |a Ballaré, Carlos Luis | |
| 773 | |t Plant Physiology |g Vol.152, no.2 (2010), p.1084-1095 | ||
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| 900 | |a ^tJasmonate-dependent and -independent pathways mediate specific effects of solar ultraviolet B radiation on leaf phenolics and antiherbivore defense | ||
| 900 | |a ^aDemkura^bP.V. | ||
| 900 | |a ^aAbdala^bG. | ||
| 900 | |a ^aBaldwin^bI.T. | ||
| 900 | |a ^aBallaré^bC.L. | ||
| 900 | |a ^aDemkura^bP. V. | ||
| 900 | |a ^aAbdala^bG. I. | ||
| 900 | |a ^aBaldwin^bI. T. | ||
| 900 | |a ^aBallaré^bC. L. | ||
| 900 | |a ^aDemkura^bP.V.^tInstituto de Investigaciones Fisiológicas y Ecológicas vinculadas a la Agricultura, Consejo Nacional de Investigaciones CientÃficas y Técnicas-Universidad de Buenos Aires, C1417DSE Buenos Aires, Argentina | ||
| 900 | |a ^aAbdala^bG.^tDepartamento de Ciencias Naturales, Facultad de Ciencias Exactas FisicoquÃmicas y Naturales, Universidad Nacional de RÃo Cuarto, 5800 RÃo Cuarto, Argentina | ||
| 900 | |a ^aBaldwin^bI.T.^tDepartment of Molecular Ecology, Max-Planck-Institute for Chemical Ecology, 07745 Jena, Germany | ||
| 900 | |a ^aBallaré^bC.L. | ||
| 900 | |a ^tPlant Physiology^cPlant Physiol. | ||
| 900 | |a eng | ||
| 900 | |a 1084 | ||
| 900 | |a ^i | ||
| 900 | |a Vol. 152, no. 2 | ||
| 900 | |a 1095 | ||
| 900 | |a ACETIC ACID DERIVATIVE | ||
| 900 | |a CYCLOPENTANE DERIVATIVE | ||
| 900 | |a JASMONIC ACID | ||
| 900 | |a JASMONIC ACID METHYL ESTER | ||
| 900 | |a OXYLIPIN | ||
| 900 | |a PHENOL DERIVATIVE | ||
| 900 | |a GENE SILENCING | ||
| 900 | |a GENETICS | ||
| 900 | |a METABOLISM | ||
| 900 | |a PLANT LEAF | ||
| 900 | |a RADIATION EXPOSURE | ||
| 900 | |a SIGNAL TRANSDUCTION | ||
| 900 | |a SUNLIGHT | ||
| 900 | |a TOBACCO | ||
| 900 | |a TRANSGENIC PLANT | ||
| 900 | |a ULTRAVIOLET RADIATION | ||
| 900 | |a ACETIC ACIDS | ||
| 900 | |a ANIMALS | ||
| 900 | |a CYCLOPENTANES | ||
| 900 | |a INSECTS | ||
| 900 | |a OXYLIPINS | ||
| 900 | |a PHENOLS | ||
| 900 | |a PLANT LEAVES | ||
| 900 | |a PLANTS, GENETICALLY MODIFIED | ||
| 900 | |a ULTRAVIOLET RAYS | ||
| 900 | |a HEXAPODA | ||
| 900 | |a NICOTIANA ATTENUATA | ||
| 900 | |a Ultraviolet B [UV-B] radiation, a very small fraction of the daylight spectrum, elicits changes in plant secondary metabolism that have large effects on plant-insect interactions. The signal transduction pathways that mediate these specific effects of solar UV-B are not known. We examined the role of jasmonate signaling by measuring responses to UV-B in wild-type and transgenic jasmonate-deficient Nicotiana attenuata plants in which a lipoxygenase gene [NaLOX3] was silenced [as-lox]. In wild-type plants, UV-B failed to elicit the accumulation of jasmonic acid [JA] or the bioactive JA-isoleucine conjugate but amplified the response of jasmonate-inducible genes, such as trypsin proteinase inhibitor [TPI], to wounding and methyl jasmonate, and increased the accumulation of several phenylpropanoid derivatives. Some of these phenolic responses [accumulation of caffeoyl-polyamine conjugates] were completely lacking in as-lox plants, whereas others [accumulation of rutin and chlorogenic acid] were similar in both genotypes. In open field conditions, as-lox plants received more insect damage than wild-type plants, as expected, but the dramatic increase in resistance to herbivory elicited by UV-B exposure, which was highly significant in wild-type plants, did not occur in as-lox plants. We conclude that solar UV-B [1] uses jasmonate-dependent and -independent pathways in the elicitation of phenolic compounds, and [2] increases sensitivity to jasmonates, leading to enhanced expression of wound-response genes [TPI]. The lack of UV-B-induced antiherbivore protection in as-lox plants suggests that jasmonate signaling plays a central role in the mechanisms by which solar UV-B increases resistance to insect herbivores in the field. | ||
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