eaf plasticity across wet and dry seasons in Croton blanchetianus (Euphorbiaceae) at a tropical dry fores

Autor(es):Mostrar menos -

Mendes, Keila Rego ^[1] ; Batista-Silva, Willian ^[2] ; Dias-Pereira, Jaqueline ^[3] ; Pereira, Marcos P. S. ^[4] ; Souza, Eliane V. ^[3] ; Serrao, Jose E. ^[5] ; Granja, Joao A. A. ^[6] ; Pereira, Eugenia C. ^[7] ; Gallacher, David J. ^[8] ; Mutti, Pedro R. ^[1] ; da Silva, Duany T. C. ^[9] ; de Souza Junior, Rogerio S. ^[10] ; Costa, Gabriel B. ^[11] ; Bezerra, Bergson G. ^[1] ; Silva, Claudio M. Santos e ^[1] ; Pompelli, Marcelo F. ^[12]

Afiliação do(s) autor(es):Mostrar menos -

^[1] Univ Fed Rio Grande do Norte, Dept Atmospher & Climate Sci, Ave Senador Salgado Filho 3000, BR-59078970 Natal, RN - Brazil

^[2] Univ Fed Vicosa, Dept Plant Biol, Plant Physiol Grad Program, Vicosa, MG - Brazil

^[3] Univ Fed Vicosa, Plant Anat Lab, Rio Paranaiba, MG - Brazil

^[4] State Secretariat Environm & Water Resources Alag, Maceio, AL - Brazil

^[5] Univ Fed Vicosa, Dept Biol, Vicosa, MG - Brazil

^[6] Sch Aggeu Magalhaes, Serra Talhada, PE - Brazil

^[7] Univ Fed Pernambuco, Dept Geog Sci, Recife, PE - Brazil

^[8] Univ Sydney, Plant Breeding Inst, Narrabri, NSW - Australia

^[9] Fed Univ West Para, Inst Engn & Geosci, Rua Vera Paz S-N, BR-68035110 Santarem - Brazil

^[10] Univ Fed Pernambuco, BR-50670901 Recife, PE - Brazil

^[11] Fed Univ West Para, Inst Biodivers & Forests, Rua Vera Paz S-N, BR-68035110 Santarem - Brazil

^[12] Grp Reg Invest Participat Pequenos Prod Costa Atl, Carrera 6 77-305, Monteria, Cordoba - Colombia

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIFIC REPORTS; v. 12, n. 1 JAN 19 2022.
• Citações Web of Science: 0

Resumo

Plant species of the Brazilian Caatinga experience seasonal wet and dry extremes, requiring seasonally different leaf characteristics for optimizing water availability. We investigated if Croton blanchetianus Baill exhibits leaf morphoanatomical traits across seasons and positioning in sunlight/natural shade. Leaves of ten 1-3 m tall plants in full sunlight and ten in natural shade were assessed in May, July (wet season), October and December (dry season) 2015 for gas exchange, leaf size, lamina and midrib cross sections (14 parameters), and chloroplast structure (5 parameters). Net photosynthesis was greater during the wet season (21.6 mu m(-2) s(-1)) compared to the dry season (5.8 mu m(-2) s(-1)) and was strongly correlated with almost all measured parameters (p < 0.01). Shaded leaves in the wet season had higher specific leaf area (19.9 m(2) kg(-1) in full-sun and 23.1 m(2) kg(-1) in shade), but in the dry season they did not differ from those in full sun (7.5 m(2) kg(-1) and 7.2 m(2) kg(-1)). In the wet season, the expansion of the adaxial epidermis and mesophyll lead to larger and thicker photosynthetic area of leaves. Furthermore, chloroplast thickness, length and area were also significantly larger in full sunlight (2.1 mu m, 5.1 mu m, 15.2 mu m(2); respectively) and shaded plants (2.0 mu m, 5.2 mu m, 14.8 mu m(2); respectively) during wetter months. Croton blanchetianus exhibits seasonal plasticity in leaf structure, presumably to optimize water use efficiency during seasons of water abundance and deficit. These results suggest that the species is adaptable to the increased drought stress projected by climate change scenarios. (AU)

• Processo FAPESP: 09/52468-0 - Impactos de mudanças climáticas sobre a cobertura e uso da terra em Pernambuco: geração e disponibilização de informações para o subsídio a políticas públicas
• Beneficiário: Jean Pierre Henry Balbaud Ometto
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático