Water stress and warming impact nutrient use efficiency of Mombasa grass (Megathyrsus maximus) in tropical conditions

Autor(es)

Viciedo, Dilier Olivera ^[1] ; Prado, Renato de Mello ^[1] ; Martinez, Carlos A. ^[2] ; Habermann, Eduardo ^[2] ; Ferraz Branco, Roberto Botelho ^[3] ; Piccolo, Marisa de Cassia ^[4] ; Hurtado, Alexander Calero ^[1] ; Calzada, Kolima Pena ^[1] ; Lata Tenesaca, Luis F. ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Fac Agr & Veterinarian Sci, Jaboticabal - Brazil

^[2] Univ Sao Paulo, Dept Biol, Ribeirao Preto FFCLRP, Ribeirao Preto - Brazil

^[3] Sao Paulo Agribusiness Technol Agcy APTA, Ribeirao Preto - Brazil

^[4] Univ Sao Paulo, Ctr Nucl Energy Agr, Piracicaba - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF AGRONOMY AND CROP SCIENCE; v. 207, n. 1, p. 128-138, FEB 2021.
• Citações Web of Science: 5

Resumo

Temperature and other abiotic factors, such water and nutrient availability, play an important role for plants in response to the changing environments. At this regard, both warming and drought might affect the nutrient use efficiency (NUE) and growth ofMegathyrsus maximusa C4 forage grass of high interest for cattle feeding. However, the nutrient requirements of this species under climate change are unknown. Therefore, we aimed to evaluate the individual and combined effects of two levels of temperature: ambient and elevated temperature (2 degrees C above ambient temperature), and two levels of soil water availability: irrigated plants and non-irrigated plants on accumulation of leaf nutrients, NUE and biomass production ofM. maximus. Temperature control was performed by a temperature free-air-controlled enhancement (T-FACE) system under field conditions. In general, we observed that warming under well-irrigated conditions increased the leaf accumulation of most nutrients, improving the NUE of N, P, K, Ca, Mg, Cu, Mn and Zn. Plant growth was also enhanced under warming effects, with higher leaf dry mass accumulation and root development. Meanwhile, drought decreased NUE of K, Ca, B and leaf dry biomass, while root growth was stimulated. The combined effects of warming and drought on nutrient accumulation, NUE and plant growth tended to be greater than the individual effects expected from a single factor; thus, warming mitigated the negative impacts of individual drought. In summary, our findings suggest that warming and drought, both as individual and combined factors, will change the nutrient requirements ofM. maximusin tropical ecosystems. (AU)

• 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
• Modalidade de apoio: 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
• Modalidade de apoio: Bolsas no Brasil - Doutorado