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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Impact of high atmospheric CO2 concentrations on the seasonality of water-related processes, gas exchange, and carbohydrate metabolism in coffee trees under field conditions

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Author(s):
Esteves Sanches, Rodrigo Fazani [1] ; Centeno, Danilo da Cruz [2] ; Braga, Marcia Regina [1] ; da Silva, Emerson Alves [1]
Total Authors: 4
Affiliation:
[1] Inst Bot, Nucleo Pesquisa Fisiol & Bioquim, BR-04045972 Sao Paulo, SP - Brazil
[2] Univ Fed ABC, Ctr Ciencias Nat & Humans, BR-09606070 Sao Bernardo Do Campo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Climatic Change; v. 162, n. 3 JUN 2020.
Web of Science Citations: 0
Abstract

Increasing atmospheric CO2 concentrations ({[}CO2]) are unequivocal, widespread, and responsible for increased mean global temperatures and altered precipitation patterns. In this context, among the topics that need to be better understood are the changes in the water-related processes and gas exchange properties of plants grown under these conditions. Notably, the effects of climate change on coffee (Coffea spp.) production are particularly concerning given the importance of this commodity. Especially, it has been reported that coffee trees exhibit better photosynthetic efficiency when grown at higher {[}CO2] levels. In order to elucidate the mechanisms involved with this response, the seasonality of water-related processes, gas exchange, and carbohydrate metabolism were investigated using C. arabica var. Red Catuai grown at ambient and high {[}CO2] under field conditions, at a free-air CO2 enrichment (FACE) facility for coffee, in Brazil. The trees were evaluated fortnightly, from November to February (hot and rainy-summer) and from June to September (cold and dry-winter). It was found that C. arabica trees grown under high {[}CO2] conditions exhibited increased photosynthetic rates (averaging 121% higher in summer and 45% higher in winter) in both seasons, without displaying any significant changes in the seasonal photosynthesis pattern. Additionally, there was a tendency for the coffee trees grown at high {[}CO2] to exhibit increased levels of soluble carbohydrates, organic acids, and amino acids in the leaves. Our findings suggest that coffee trees adapt to increased {[}CO2] through increased photosynthetic rates, enhanced stomatal conductance regulation, and augmented carbohydrate and organic acid synthesis. It is plausible that these features could help mitigate the effects caused by climate change. (AU)

FAPESP's process: 12/08875-3 - Effects of high atmospheric CO2 concentration in open top chambers and Free Air CO2 Enrichment (face) systems on photosynthesis and natural resistance mechanisms of coffee plants to coffee rust
Grantee:Emerson Alves da Silva
Support Opportunities: Research Program on Global Climate Change - Regular Grants