Post-fire resprouting ability in young plants of Astronium fraxinifolium
Marilaine Cristina Marques Leite A , Alice Souza Leal A , Maycon Anderson Araujo A and Aline Redondo Martins
A *
A Department of Biology and Animal Science, Universidade Estadual de São Paulo ‘Júlio de Mesquita Filho’, Faculdade de Engenharia de Ilha Solteira, Ilha Solteira, SP, 15385-000, Brazil.
Australian Journal of Botany 70(7) 494-498 https://doi.org/10.1071/BT21056
Submitted: 4 May 2021 Accepted: 12 September 2022 Published: 26 October 2022
© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing
Abstract
Fire is an important ecological factor that influences the composition of the Cerrado vegetation in Brazil. In environments where fire is recurrent, tree species with seedlings/saplings that accumulate underground reserves and/or present distinctive underground structures (tuberous roots and root crowns) are more likely to reach maturity. Astronium fraxinifolium Schott is a tree species native to the Cerrado. The tree has xeromorphic characteristics, which perhaps is an adaptation to dry and rocky environments. To evaluate whether these morphological characteristics allow the species to recover from fire, an experiment was conducted where we compared burnt and unburnt saplings of A. fraxinifolium. We verified the emergence of buds closer to the root crown and compared the storage dynamics of lipids, starch, phenolic compounds, and mucilage between the burnt and unburnt saplings. Buds were observed in some of the individuals within 7 days of burning. The burnt saplings showed a high survival rate of 77.8%. Two cotyledonary buds per plant originated from the base of the stem. The rapid recovery of the species could be attributed to the starch reserves in the stems and roots, which helped nourish the buds and the resprouted seedlings. The results of our study showed the resprouting ability of A. fraxinifolium as a survival mechanism in response to fire events.
Keywords: accumulation of reserves, bud bank, cotyledon buds, fire, gonçalo-alves, plant anatomy, plant structure, sprouting.
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