| Full text | |
| Author(s): Show less - |
Habermann, Eduardo
;
de Oliveira, Eduardo Augusto Dias
;
Bianconi, Matheus Enrique
;
Contin, Daniele Ribeiro
;
Lemos, Maria Teresa Oliverio
;
Costa, Joao Vitor Campos Pinho
;
Oliveira, Kamilla Silva
;
Riul, Beatriz Neroni
;
Bonifacio-Anacleto, Fernando
;
Viciedo, Dilier Olivera
;
Approbato, Andressa Uehara
;
Alzate-Marin, Ana Lilia
;
Prado, Renato de Mello
;
Costa, Katia Aparecida de Pinho
;
Martinez, Carlos Alberto
Total Authors: 15
|
| Document type: | Journal article |
| Source: | Plant Physiology and Biochemistry; v. 207, p. 13-pg., 2024-02-16. |
| Abstract | |
The concentration of atmospheric CO2 and temperature are pivotal components of ecosystem productivity, carbon balance, and food security. In this study, we investigated the impacts of a warmer climate (+2 degrees C above ambient temperature) and an atmosphere enriched with CO2 (600 ppm) on gas exchange, antioxidant enzymatic system, growth, nutritive value, and digestibility of a well-watered, managed pasture of Megathyrsus maximus, a tropical C-4 forage grass, under field conditions. Elevated [CO2] (eC) improved photosynthesis and reduced stomatal conductance, resulting in increased water use efficiency and plant C content. Under eC, stem biomass production increased without a corresponding increase in leaf biomass, leading to a smaller leaf/stem ratio. Additionally, eC had negative impacts on forage nutritive value and digestibility. Elevated temperature (eT) increased photosynthetic gains, as well as stem and leaf biomass production. However, it reduced P and K concentration, forage nutritive value, and digestibility. Under the combined conditions of eC and eT (eCeT), eT completely offset the effects of eC on the leaf/stem ratio. However, eT intensified the effects of eC on photosynthesis, leaf C concentration, biomass accumulation, and nutritive value. This resulted in a forage with 12% more acid detergent fiber content and 28% more lignin. Additionally, there was a decrease of 19% in crude protein leading to a 15% decrease in forage digestibility. These changes could potentially affect animal feeding efficiency and feedback climate change, as ruminants may experience an amplification in methane emissions. Our results highlight the critical significance of conducting multifactorial field studies when evaluating plant responses to climate change variables. (AU) | |
| FAPESP's process: | 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 |
| Grantee: | Carlos Alberto Martinez y Huaman |
| Support Opportunities: | Research Program on Global Climate Change - Thematic Grants |
| FAPESP's process: | 20/16359-1 - Acclimation, carbon flux, and greenhouse gases emission from Brachiaria brizantha cv. Marandu and Brachiaria Mavuno pastures inoculated with Azospirillum brasilense under a warmed atmosphere under field conditions |
| Grantee: | Eduardo Habermann |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 16/09742-8 - Water relations, gas exchange, leaf anatomy and thermographic analysis of two forage species under warming and drought stress at field conditions |
| Grantee: | Eduardo Habermann |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 14/00317-7 - Flux of carbon and greenhouse gases in a pasture ecosystem constituted by Panicum maximum Jacq. and Stylosanthes capitata Voegel cultivated under elevated CO2 and warming in a FACE/T-FACE system |
| Grantee: | Eduardo Augusto Dias de Oliveira |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |