Local adaptation of a dominant coastal tree to freshwater availability and solar radiation suggested by genomic and ecophysiological approaches
Nenhuma Miniatura disponível
Data
2019-12-01
Autores
Cruz, Mariana Vargas
Mori, Gustavo Maruyama [UNESP]
Signori-Müller, Caroline
da Silva, Carla Cristina
Oh, Dong-Ha
Dassanayake, Maheshi
Zucchi, Maria Imaculada
Oliveira, Rafael Silva
de Souza, Anete Pereira
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
Local adaptation is often a product of environmental variations in geographical space and has implications for biodiversity conservation. We investigated the role of latitudinal heterogeneity in climate on the organization of genetic and phenotypic variation in the dominant coastal tree Avicennia schaueriana. In a common garden experiment, samples from an equatorial region, with pronounced seasonality in precipitation, accumulated less biomass, and showed lower stomatal conductance and transpiration, narrower xylem vessels, smaller leaves and higher reflectance of long wavelengths by the stem epidermis than samples from a subtropical region, with seasonality in temperature and no dry season. Transcriptomic differences identified between trees sampled under field conditions at equatorial and subtropical sites, were enriched in functional categories such as responses to temperature, solar radiation, water deficit, photosynthesis and cell wall biosynthesis. Remarkably, the diversity based on genome-wide SNPs revealed a north-south genetic structure and signatures of selection were identified for loci associated with photosynthesis, anthocyanin accumulation and the responses to osmotic and hypoxia stresses. Our results suggest the existence of divergence in key resource-use characteristics, likely driven by seasonality in water deficit and solar radiation. These findings provide a basis for conservation plans and for predicting coastal plants responses to climate change.
Descrição
Palavras-chave
Como citar
Scientific Reports, v. 9, n. 1, 2019.