| Registro completo |
| Provedor de dados: |
Braz. J. Plant Physiol.
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| País: |
Brazil
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| Título: |
Morphological and physiological adjustments of Brazilwood (Caesalpinia echinata Lam.) to direct solar radiation
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| Autores: |
Mengarda,Liana Hilda Golin
Milanez,Camilla Rozindo Dias
Silva,Diolina Moura
Aguilar,Marco Antonio Galeas
Cuzzuol,Geraldo Rogério Faustini
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| Data: |
2012-09-01
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| Ano: |
2012
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| Palavras-chave: |
Forest succession
Light stress
Photoinhibition
Leaf anatomy
Soluble carbohydrates
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| Resumo: |
This study aimed to characterize the alarm and resistance phases of stress of Caesalpinia echinata under intense irradiance in order to better define its position on forest succession. The alarm phase was identified by rapid reduction in the maximum quantum yield of PSII primary photochemical reactions (ΦP0 = FV/FM) and Performance Index (PIABS) followed by total leaf abscission in the first week of exposure to direct sunlight. The new leaves grown showed recovery of chlorophyll a parameters, increase in blade thickness, elongation of the palisade and spongy parenchymas, higher water content, and reduction of specific leaf area. These changes were associated with the osmoprotector of sucrose and antioxidative of raffinose effects, which indicate an efficient adjustment system to intense irradiance in the resistance phase of stress. However, the continuous decrease in photosynthetic pigments in the resistance phase combined with the photodamage in the fluorescence of Chl a and total abscission of leaves in the alarm phase are strong indications that C. echinata is a shade and late or climax species in forest succession.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202012000300003
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| Editor: |
Brazilian Journal of Plant Physiology
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| Relação: |
10.1590/S1677-04202012000300003
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| Formato: |
text/html
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| Fonte: |
Brazilian Journal of Plant Physiology v.24 n.3 2012
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| Direitos: |
info:eu-repo/semantics/openAccess
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