Resilience of a semi-deciduous shrub, Cistus salvifolius, to severe summer drought and heat stress
Shrubs often form the understorey in Mediterranean oak woodlands. These shrubs are exposed to recurrent water deficits, but how they will respond to predicted future exacerbation of drought is not yet understood. The ecophysiology of the shrub Cistus salvifolius L. was studied over the summer of 2005, which was during a heat-wave superimposed on the most severe drought in the Iberian Peninsula in the last 140 years. Branch water potential fell drastically during the summer, accompanied by stomatal closure and downregulation of PSII, with a concomitant loss of chlorophyll in the leaves. A parallel increase in the ratio of light-dissipating to light-capturing pigments and the proportion of xanthophyll cycle pigments in the de-epoxidated state, along with alterations in the structure of the light harvesting complex, may have reduced the potential for damage to leaves. Substantial increases in leaf tocopherol content during high radiation may have reduced damage from free radicals. Following autumn rains, leaves of the same shrubs showed physiological recovery, indicating the resilience of this Mediterranean species, for which an extremely dry hydrological year with 45% less rainfall than average, did not prevent healthy leaf functioning in response to renewed soil moisture availability.
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Format: | artículo biblioteca |
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CSIRO Publishing
2015-09-24
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Subjects: | Antioxidants, Chlorophyll fluorescence, Photosystem II, Thermography, Water potential, Xanthophyll cycle, |
Online Access: | http://hdl.handle.net/10261/126393 |
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dig-idab-es-10261-1263932020-02-13T08:39:09Z Resilience of a semi-deciduous shrub, Cistus salvifolius, to severe summer drought and heat stress Grant, Olga M. Tronina, Łukasz García-Plazaola, José I. Esteban, Raquel Santos Pereira, João Chaves, M. M. Antioxidants Chlorophyll fluorescence Photosystem II Thermography Water potential Xanthophyll cycle Shrubs often form the understorey in Mediterranean oak woodlands. These shrubs are exposed to recurrent water deficits, but how they will respond to predicted future exacerbation of drought is not yet understood. The ecophysiology of the shrub Cistus salvifolius L. was studied over the summer of 2005, which was during a heat-wave superimposed on the most severe drought in the Iberian Peninsula in the last 140 years. Branch water potential fell drastically during the summer, accompanied by stomatal closure and downregulation of PSII, with a concomitant loss of chlorophyll in the leaves. A parallel increase in the ratio of light-dissipating to light-capturing pigments and the proportion of xanthophyll cycle pigments in the de-epoxidated state, along with alterations in the structure of the light harvesting complex, may have reduced the potential for damage to leaves. Substantial increases in leaf tocopherol content during high radiation may have reduced damage from free radicals. Following autumn rains, leaves of the same shrubs showed physiological recovery, indicating the resilience of this Mediterranean species, for which an extremely dry hydrological year with 45% less rainfall than average, did not prevent healthy leaf functioning in response to renewed soil moisture availability. Peer Reviewed 2015-12-02T12:59:48Z 2015-12-02T12:59:48Z 2015-09-24 2015-12-02T12:59:48Z artículo http://purl.org/coar/resource_type/c_6501 issn: 1445-4416 Functional Plant Biology 42(2): 219- 228 (2015) http://hdl.handle.net/10261/126393 10.1071/FP14081 http://dx.doi.org/10.1071/FP14081 Sí none CSIRO Publishing |
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Antioxidants Chlorophyll fluorescence Photosystem II Thermography Water potential Xanthophyll cycle Antioxidants Chlorophyll fluorescence Photosystem II Thermography Water potential Xanthophyll cycle |
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Antioxidants Chlorophyll fluorescence Photosystem II Thermography Water potential Xanthophyll cycle Antioxidants Chlorophyll fluorescence Photosystem II Thermography Water potential Xanthophyll cycle Grant, Olga M. Tronina, Łukasz García-Plazaola, José I. Esteban, Raquel Santos Pereira, João Chaves, M. M. Resilience of a semi-deciduous shrub, Cistus salvifolius, to severe summer drought and heat stress |
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Shrubs often form the understorey in Mediterranean oak woodlands. These shrubs are exposed to recurrent water deficits, but how they will respond to predicted future exacerbation of drought is not yet understood. The ecophysiology of the shrub Cistus salvifolius L. was studied over the summer of 2005, which was during a heat-wave superimposed on the most severe drought in the Iberian Peninsula in the last 140 years. Branch water potential fell drastically during the summer, accompanied by stomatal closure and downregulation of PSII, with a concomitant loss of chlorophyll in the leaves. A parallel increase in the ratio of light-dissipating to light-capturing pigments and the proportion of xanthophyll cycle pigments in the de-epoxidated state, along with alterations in the structure of the light harvesting complex, may have reduced the potential for damage to leaves. Substantial increases in leaf tocopherol content during high radiation may have reduced damage from free radicals. Following autumn rains, leaves of the same shrubs showed physiological recovery, indicating the resilience of this Mediterranean species, for which an extremely dry hydrological year with 45% less rainfall than average, did not prevent healthy leaf functioning in response to renewed soil moisture availability. |
format |
artículo |
topic_facet |
Antioxidants Chlorophyll fluorescence Photosystem II Thermography Water potential Xanthophyll cycle |
author |
Grant, Olga M. Tronina, Łukasz García-Plazaola, José I. Esteban, Raquel Santos Pereira, João Chaves, M. M. |
author_facet |
Grant, Olga M. Tronina, Łukasz García-Plazaola, José I. Esteban, Raquel Santos Pereira, João Chaves, M. M. |
author_sort |
Grant, Olga M. |
title |
Resilience of a semi-deciduous shrub, Cistus salvifolius, to severe summer drought and heat stress |
title_short |
Resilience of a semi-deciduous shrub, Cistus salvifolius, to severe summer drought and heat stress |
title_full |
Resilience of a semi-deciduous shrub, Cistus salvifolius, to severe summer drought and heat stress |
title_fullStr |
Resilience of a semi-deciduous shrub, Cistus salvifolius, to severe summer drought and heat stress |
title_full_unstemmed |
Resilience of a semi-deciduous shrub, Cistus salvifolius, to severe summer drought and heat stress |
title_sort |
resilience of a semi-deciduous shrub, cistus salvifolius, to severe summer drought and heat stress |
publisher |
CSIRO Publishing |
publishDate |
2015-09-24 |
url |
http://hdl.handle.net/10261/126393 |
work_keys_str_mv |
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