Rising CO(2)in the field does not offset warming or drought constraints on leaf growth of a C(3)forage

Author(s)

de Camargo-Bortolin, L. H. G. ^[1] ; Habermann, E. ^[2] ; Vicente, P. ^[1] ; Barboza, A. ^[2] ; Groppo, M. ^[2] ; Prado, C. H. B. A. ^[1] ; Martinez, C. A. ^[2]

Affiliation

^[1] Univ Fed Sao Carlos, Dept Bot, Rd Washington Luiz Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Sao Paulo, Dept Biol, FFCLRP, Ave Bandeirantes 3900, BR-14040901 Ribeirao Preto, SP - Brazil

• Document type: Journal article
• Source: EXPERIMENTAL AGRICULTURE; v. 56, n. 2, p. 265-279, APR 2020.
• Web of Science Citations: 0

Abstract

The regrowth of a C(3)forageStylosanthes capitatain a rain-fed field provided the weekly data collection in the southeast of Brazil during a heat event in autumn. A system named Trop-T-FACE simulated the free-air carbon dioxide enrichment and the enhanced temperature in four climatic regimes: current atmospheric conditions (Control), CO(2)enrichment (600 ppm, eC), warming (2 degrees C above ambient canopy temperature, eT), and a combination of eC + eT. The area and biomass of foliage per shoot decreased, and the number of flowers per shoot and flowered ramification increased under single eC treatment besides the increment in palisade parenchyma of leaves. Increased investment in flowering in eC occurred notably when the soil water content was higher than 0.30 m(3) m(-3). Single eT treatment also impaired the area or biomass of foliage production per shoot, raised the shoot mortality, and promoted the increment of the spongy leaf parenchyma. There was some mitigation of the adverse effects of foliage production of eT or eC in eC + eT, but under this combined treatment, the shoot mortality also increased. Changes in leaf tissues under eC or eT or some mitigation of adverse effects in eC + eT did not offset the constraints on leaf growth per shoot. The harmful impact on foliage production by eC, eT, or eC + eT under rain-fed conditions indicated no advantages for feeding the livestock with the C(3)forageS. capitatain expected climate change under field conditions. (AU)

• FAPESP's process: 12/20847-5 - Growth, biomass and efficient use of nutrients in C3 and C4 forages species evaluated by MiniFACE
• Grantee: Lívia Haik Guedes de Camargo Bortolin
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 14/26821-3 - Comparative analysis of water relations in C3 and C4 forage species subjected to higher CO2 and warming in TROP-T-FACE system
• Grantee: Eduardo Habermann
• Support Opportunities: Scholarships in Brazil - Master
• 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