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Leaves of neotropical savanna tree species are more heat-tolerant than leaves of semi-deciduous forest species

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Abstract

Increases of air temperature due to global warming suggest that plants could be exposed to temperatures above their optimum range for performing specific physiological functions in the future. Declines in carbon exchange rates would lead to significant decreases in species performance, particularly in those lacking traits associated to heat tolerance. Savannas and semi-deciduous forests are ecosystems with high biological diversity, scattered throughout the Neotropical landscape, and very dynamic areas controlled by species traits. Significant increases in air temperatures can affect such areas if plant species of these forests lack heat tolerance. We performed heat tolerance assays to obtain T50 values of the photosystem II (PSII) of 30 Neotropical tree species from a savanna (15 species) and a semi-deciduous forest (15 species). Our goal was to test whether the typical savanna species are more heat-tolerant than semi-deciduous forest species. We also assessed if T50 was correlated with leaf morphological traits such as specific leaf area and leaf thickness. We found savanna tree leaves with lower specific leaf area, higher thickness, and higher T50 values than semi-deciduous forest plants (49.36 °C vs. 47.65 °C, respectively). Specific leaf area was negatively correlated to T50 values. Our findings suggest that semi-deciduous forest species would be more affected by temperature increases than savanna species. Whereas species traits play an important role in the dynamics of forest–savanna areas, savanna species would be favored under warmer temperatures.

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Data will be provided upon request to the corresponding author.

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Funding

This research was funded by the Coordenação de Aperfeiçoamento do Ensino Superior – CAPES – Finance code 001 and the Brazilian National Council of Research (CNPq) – grant 302897/2018–6.

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Authors and Affiliations

  1. Programa de Pós-Graduação em Ciências Biológicas (Biologia Vegetal), Instituto de Biociências, Universidade Estadual Paulista (UNESP), Av. 24-A, 1515, Rio Claro, SP, 13506-900, Brazil

    Bianca Helena Porfírio da Silva

  2. Departamento de Biologia, Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista (UNESP), Via de Acesso Prof. Paulo Donato Castellane S/N, Jaboticabal, SP, 14884-000, Brazil

    Davi Rodrigo Rossatto

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  1. Bianca Helena Porfírio da Silva
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Conceived the idea and designed the experiment: DRR. Performed the experiment: BHPS. Analyzed data: BHPS. Wrote the manuscript: BHPS and DRR.

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Correspondence to Davi Rodrigo Rossatto.

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da Silva, B.H.P., Rossatto, D.R. Leaves of neotropical savanna tree species are more heat-tolerant than leaves of semi-deciduous forest species. Theor. Exp. Plant Physiol. 34, 227–237 (2022). https://doi.org/10.1007/s40626-022-00244-2

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