Abstract
Key message
The present study showed that the heat stress (40 °C) caused changes in morphophysiological, biochemical, and ultrastructural parameters to the seeds Melanoxylon brauna, ultimately leading to loss of germination capacity.
Abstract
Temperature is an abiotic factor that influences seed germination. In the present study, we investigated morphophysiological, biochemical, and ultrastructural changes during the germination of Melanoxylon brauna seeds under heat stress. Seed germination was evaluated at constant temperatures of 25 and 40 °C. The samples consisted of seeds soaked in distilled and ionized water for 48 and 96 h at both temperatures. For the evaluation of internal morphology, the seeds were radiographed. Ultrastructural parameters were assessed using transmission electron microscopy (TEM). The production of reactive oxygen species (ROS), content of malondialdehyde (MDA) and glucose, carbonylated proteins, and activity of the enzymes (superoxide dismutase—SOD, ascorbate peroxidase—APX, catalase—CAT, peroxidase—POX, glucose-6-phosphate dehydrogenase—G6PDH, lipase, α- and β-amylase, and protease) were measured by spectrophotometric analysis. An 82% reduction in the germination of M. brauna seeds was observed at 25 °C, and 0% at 40 °C. TEM showed that seeds submitted to heat stress (40 °C) had poorly developed mitochondria and significantly reduced respiration rates. The content of ROS and protein carbonylation in seeds subjected to 40 °C increased compared to that at 25 °C. The activity of antioxidant enzymes, namely SOD, APX, CAT, and POX, was significantly reduced in seeds subjected to heat stress. Glucose content, G6PDH, and lipase activity also decreased when the seeds were exposed to heat stress. Conversely, α- and β-amylase enzymes and the protease increased due to the increase in temperature. Our data showed that the increase in temperature caused an accumulation of ROS, increasing the oxidative damage to the seeds, which led to mitochondrial dysfunction, ultimately leading to loss of germination.
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Acknowledgements
We thank the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, 170555/2017-8) and Fundação CAPES (Finance code 001) for financial support; Centro de Microscopia da Universidade Federal de Minas Gerais (UFMG) for technical support.
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LPR and EDLB conceived and designed research. LPR and RSA conducted experiments. DSB contributed new reagents or analytical tools. LPR and RCB analyzed data. LPR wrote the manuscript. All authors read and approved the manuscript.
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Reis, L.P., de Lima e Borges, E.E., Brito, D.S. et al. Heat stress-mediated effects on the morphophysiological, biochemical, and ultrastructural parameters of germinating Melanoxylon brauna Schott. seeds. Plant Cell Rep 40, 1773–1787 (2021). https://doi.org/10.1007/s00299-021-02740-2
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DOI: https://doi.org/10.1007/s00299-021-02740-2