Non-structural carbohydrates mediate seasonal water stress across Amazon forests

Autor(es):Mostrar menos -

Signori-Mueller, Caroline ^{[1, 2]} ; Oliveira, Rafael S. ^[3] ; Barros, Fernanda de Vasconcellos ^{[4, 5]} ; Tavares, Julia Valentim ^[1] ; Gilpin, Martin ^[1] ; Carvalho Diniz, Francisco ^[1] ; Marca Zevallos, Manuel J. ^{[6, 7]} ; Salas Yupayccana, Carlos A. ^[7] ; Acosta, Martin ^[8] ; Bacca, Jean ^[6] ; Cruz Chino, Rudi S. ^[7] ; Cuellar, Gina M. Aramayo ^[9] ; Cumapa, Edwin R. M. ^[6] ; Martinez, Franklin ^[9] ; Perez Mullisaca, Flor M. ^[6] ; Nina, Alex ^[7] ; Sanchez, Jesus M. Banon ^[6] ; da Silva, Leticia Fernandes ^[8] ; Tello, Ligia ^[6] ; Tintaya, Jose Sanchez ^[6] ; Martinez Ugarteche, Maira T. ^[9] ; Baker, Timothy R. ^[1] ; Bittencourt, Paulo R. L. ^{[4, 5]} ; Borma, Laura S. ^[10] ; Brum, Mauro ^{[11, 5]} ; Castro, Wendeson ^[8] ; Honorio Coronado, Euridice N. ^[12] ; Cosio, Eric G. ^[13] ; Feldpausch, Ted R. ^[4] ; Miguel Fonseca, Leticia D'Agosto ^[10] ; Gloor, Emanuel ^[1] ; Flores Llampazo, Gerardo ^[14] ; Malhi, Yadvinder ^[15] ; Monteagudo Mendoza, Abel ^[6] ; Chama Moscoso, Victor ^[6] ; Araujo-Murakami, Alejandro ^[9] ; Phillips, Oliver L. ^[1] ; Salinas, Norma ^{[15, 13]} ; Silveira, Marcos ^[8] ; Talbot, Joey ^[16] ; Vasquez, Rodolfo ^[17] ; Mencuccini, Maurizio ^{[18, 19]} ; Galbraith, David ^[1]

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

^[1] Univ Leeds, Sch Geog, Leeds, W Yorkshire - England

^[2] Univ Estadual Campinas, Inst Biol, Dept Plant Biol, Programa Pos Grad Biol Vegetal, Campinas - Brazil

^[3] Univ Estadual Campinas, Inst Biol, Dept Plant Biol, Campinas - Brazil

^[4] Univ Exeter, Coll Life & Environm Sci, Geog, Exeter, Devon - England

^[5] Univ Estadual Campinas, Programa Pos Grad Ecol, Inst Biol, Dept Plant Biol, Campinas - Brazil

^[6] Univ Nacl San Antonio Abad Cusco, Cuzco - Peru

^[7] Pontificia Univ Catolica Peru, Lima - Peru

^[8] Univ Fed Acre, Programa Posgrad Ecol & Manejo Recursos Nat, Rio Branco - Brazil

^[9] Univ Autonoma Gabriel Rene Moreno, Museo Hist Nat Noel Kempff Mercado, Santa Cruz - Bolivia

^[10] Natl Inst Space Res, Earth Syst Sci Ctr, Sao Jose Dos Campos - Brazil

^[11] Univ Arizona, Dept Ecol & Evolutionary Biol, Tucson, AZ - USA

^[12] Inst Invest Amazonia Peruana, Iquitos - Peru

^[13] Pontificia Univ Catolica Peru, Secc Quim, Lima - Peru

^[14] Univ Nacl Jorge Basadre de Grohmann, Tacna - Peru

^[15] Univ Oxford, Sch Geog & Environm, Environm Change Inst, Oxford - England

^[16] Univ Leeds, Inst Transport Studies, Leeds, W Yorkshire - England

^[17] Jardin Bot Missouri, Pasco - Peru

^[18] ICREA, Barcelona - Spain

^[19] Univ Autonoma Barcelona, CREAF, Barcelona - Spain

• Tipo de documento: Artigo Científico
• Fonte: NATURE COMMUNICATIONS; v. 12, n. 1 APR 19 2021.
• Citações Web of Science: 3

Resumo

Non-structural carbohydrates (NSC) are major substrates for plant metabolism and have been implicated in mediating drought-induced tree mortality. Despite their significance, NSC dynamics in tropical forests remain little studied. We present leaf and branch NSC data for 82 Amazon canopy tree species in six sites spanning a broad precipitation gradient. During the wet season, total NSC (NSCT) concentrations in both organs were remarkably similar across communities. However, NSCT and its soluble sugar (SS) and starch components varied much more across sites during the dry season. Notably, the proportion of leaf NSCT in the form of SS (SS:NSCT) increased greatly in the dry season in almost all species in the driest sites, implying an important role of SS in mediating water stress in these sites. This adjustment of leaf NSC balance was not observed in tree species less-adapted to water deficit, even under exceptionally dry conditions. Thus, leaf carbon metabolism may help to explain floristic sorting across water availability gradients in Amazonia and enable better prediction of forest responses to future climate change. (AU)

• Processo FAPESP: 13/50531-2 - Controles ecofisiológicos sobre a sazonalidade e variabilidade da precipitação na Amazônia
• Beneficiário: Laura de Simone Borma
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular