Bulgarian Journal of Agricultural Science
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Gas exchange, carbon metabolism and biomass in Clusia grandiflora submitted to water deficit and evaluation periods
Neire Maria M. Ferreira, Alexandre de M. Ferreira, Daniele Monteiro Ribeiro, Luma Castro de Souza, Vitor R. do Nascimento, Glauco A. dos S. Nogueira, Candido F. de O. Neto, Pedro S. da S. Campos, Benedito G. dos S. Filho, Gabriel G. T. N. Monteiro
Abstract: Forest species have their growth and metabolism affected, when they are exposed to conditions of water stress and one of the factors that contribute to water scarcity is climate change that increases over time. The objective of this work was to evaluate changes in gas exchange, carbon metabolism and biomass of Clusia grandiflora subjected to water deficit and evaluation periods. The experiment was carried out in a completely randomized design, in a 2 x 5 factorial scheme, with five replications, each as specified: two water conditions (control and water deficit) and five evaluation periods (0, 7, 14, 21 and 28 days). The variables related to gas exchange, carbon metabolism and biomass were evaluated. The design of the experiment was completely randomized.
The relative water content did not differ between the control plants and those submitted to water deficit. While stem diameter, adventitious root length, adventitious root diameter and stem dry mass decreased, when plants were exposed to water deficit. The number of leaves, stem height, leaf area and fallen leaves reduced from day 14, in plants submitted to water deficit. There was a reduction in the hydraulic conductivity and in the water potential of the xylem in the leaf from day 7 on in plants under water deficit. Among the biochemical variables, starch and sucrose concentrations increased in plants under water stress from day 14 onwards. Water deficit negatively affected gas exchange, carbon metabolism and Clusia grandiflora biomass.
Keywords: carbono assimilation; dry mass; forest species; water stress
Citation: Ferreira, N. M. M., Ferreira, A. de M., Ribeiro, D. M., de Souza, L. C., do Nascimento, V. R., Nogueira, G. A. dos S., Neto, C. F. de O., Campos, P. S. da S., Filho, B. G. dos S. & Monteiro, G. G. T. N. (2023). Gas exchange, carbon metabolism and biomass in Clusia grandiflora submitted to water deficit and evaluation periods. Bulg. J. Agric. Sci., 29(6), 1065–1074.
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Date published: 2023-12-20
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