Stomatal Development and Conductance of a Tropical Forage Legume Are Regulated by Elevated [CO2] Under Moderate Warming

Autor(es)

Habermann, Eduardo ^[1] ; Dias de Oliveira, Eduardo A. ^[2] ; Contin, Daniele Ribeiro ^[1] ; San Martin, Juca A. B. ^[1] ; Curtarelli, Lucas ^[1] ; Gonzalez-Meler, Miquel A. ^[2] ; Martinez, Carlos Alberto ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Fac Philosophy Sci & Languages Ribeirao Preto FFC, Dept Biol, Ribeirao Preto - Brazil

^[2] Univ Illinois, Dept Biol Sci, Ecol & Evolut, Chicago, IL 60680 - USA

• Tipo de documento: Artigo Científico
• Fonte: FRONTIERS IN PLANT SCIENCE; v. 10, MAY 31 2019.
• Citações Web of Science: 0

Resumo

The opening and closing of stomata are controlled by the integration of environmental and endogenous signals. Here, we show the effects of combining elevated atmospheric carbon dioxide concentration (eCO(2); 600 mu mol mol(-1)) and warming (+2 degrees C) on stomatal properties and their consequence to plant function in a Stylosanthes capitata Vogel (C-3) tropical pasture. The eCO(2) treatment alone reduced stomatal density, stomatal index, and stomatal conductance (g(s)), resulting in reduced transpiration, increased leaf temperature, and leading to maintenance of soil moisture during the growing season. Increased CO2 concentration inside leaves stimulated photosynthesis, starch content levels, water use efficiency, and PSII photochemistry. Under warming, plants developed leaves with smaller stomata on both leaf surfaces; however, we did not see effects of warming on stomatal conductance, transpiration, or leaf water status. Warming alone enhanced PSII photochemistry and photosynthesis, and likely starch exports from chloroplasts. Under the combination of warming and eCO(2), leaf temperature was higher than that of leaves from the warming or eCO(2) treatments. Thus, warming counterbalanced the effects of CO2 on transpiration and soil water content but not on stomatal functioning, which was independent of temperature treatment. Under warming, and in combination with eCO(2), leaves also produced more carotenoids and a more efficient heat and fluorescence dissipation. Our combined results suggest that control on stomatal opening under eCO(2) was not changed by a warmer environment; however, their combination significantly improved whole-plant functioning. (AU)

• Processo FAPESP: 14/26821-3 - Análise comparativa das relações hídricas em espécies forrageiras C3 e C4 submetidas a elevado nível de CO2 e aquecimento em sistema TROP-T-FACE
• Beneficiário: Eduardo Habermann
• Linha de fomento: Bolsas no Brasil - Mestrado
• Processo FAPESP: 14/00317-7 - Fluxo de carbono e de gases estufa em ecossistema de pastagem composta por Panicum maximum Jacq. e Stylosanthes capitata Voegel cultivadas sob elevada concentração de CO2 e elevada temperatura em sistemas FACE/T-FACE
• Beneficiário: Eduardo Augusto Dias de Oliveira
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 08/58075-8 - Miniface climate-change impact experiment to analyze the effects of elevated CO2 and warming on photosynthesis, gene expression, biochemistry, growth, nutrient dynamics and yield of two contrasting tropical forage species
• Beneficiário: Carlos Alberto Martinez y Huaman
• Linha de fomento: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático
• Processo FAPESP: 16/09742-8 - Relações hídricas, trocas gasosas, anatomia foliar e análises termográficas de duas espécies forrageiras sob aquecimento e deficiência hídrica em condições de campo
• Beneficiário: Eduardo Habermann
• Linha de fomento: Bolsas no Brasil - Doutorado