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Germination ecology of the perennial herb Xyris longiscapa: inter-annual variation in seed germination and seasonal dormancy cycles

Published online by Cambridge University Press:  26 July 2019

Túlio G. S. Oliveira  and
Queila S. Garcia Open the ORCID record for Queila S. Garcia [Opens in a new window]
Túlio G. S. Oliveira
Affiliation:
Laboratório de Fisiologia Vegetal, Departamento de Botânica, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, 31270-901, Pampulha, Belo Horizonte, Minas Gerais, Brazil
Queila S. Garcia*
Affiliation:
Laboratório de Fisiologia Vegetal, Departamento de Botânica, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, 31270-901, Pampulha, Belo Horizonte, Minas Gerais, Brazil
*
Author for correspondence: Queila S. Garcia, Email: queila@icb.ufmg.br
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Abstract

Germination ecology was investigated in a natural population of Xyris longiscapa, a perennial herbaceous species endemic to the Brazilian campo rupestre. Seeds were collected over four consecutive years (2014 to 2017) to evaluate germination responses to a range of temperatures (from 15 to 30°C). The light requirement was evaluated in seeds collected in 2014. Seeds collected in 2014 were also buried in soil in the natural habitat of the species to evaluate changes in germinability at different temperatures over the time. Seeds showed an absolute light requirement for germination. Seed germination was affected by temperature, collection year and the interaction between these two factors. Seeds collected in 2014 showed a narrower temperature range for germination (15–20°C), compared with the seeds collected in 2015, 2016 and 2017 that germinated in a temperature range of 15–25°C. Buried seeds remained viable in soil for at least 14 months and exhibited seasonal dormancy cycling. Secondary dormancy was induced during the rainy season and alleviated during the dry season, following a conditional dormancy/dormancy cycle. The degree of primary dormancy appeared to be influenced by the environmental conditions experienced by seeds during maturation. Primary dormancy (when present), seed persistence in soil and seasonal dormancy cycles are strategies of X. longiscapa to enhance regeneration success in the harsh environment of the Brazilian campo rupestre.

Keywords

Brazilian campo rupestreseed dormancysecondary dormancysoil seed bankXyridaceae
Type
Research Paper
Information
Seed Science Research , Volume 29 , Issue 3 , September 2019 , pp. 179 - 183
Copyright
Copyright © Cambridge University Press 2019 

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