Variation in Seed Dormancy of Chaco Seasonally Dry Forest Species: Effects of Seed Traits and Population Environmental Conditions

Tania Bertuzzi, Diego López-Spahr, Carlos A. Gómez, Silvia Sühring, Gisela Malagrina, Carol C. Baskin, Guadalupe Galíndez

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The persistence of subtropical seasonally dry forests urgently requires the implementation of ex situ conservation and restoration programs. We studied variation in seed traits and dormancy of six native species growing in seasonally dry Chaco forests of Argentina. We documented high intra- and interspecific variability in seed traits and dormancy. Fresh seeds of Geoffroea decorticans and Parasenegalia visco (Fabaceae) were water-permeable and nondormant (ND), while those of Parkinsonia praecox and Vachellia aroma (Fabaceae) were water-impermeable and had physical dormancy (PY). Seeds of Schnopsis lorentzii (Anacardiaceae) and Sarcomphalus mistol (Rhamnaceae) were water-permeable and had physiological dormancy (PD). Mechanical and chemical scarification were the most effective methods to break PY, and dry storage for 3 months was effective in breaking PD. Seeds of large-seeded species were ND or had PD, and those of small-seeded species had PY. Species inhabiting moist habitats had ND seeds, whereas those from seasonally dry habitats had seeds with PY or PD. These results suggest that seed traits and dormancy are species-specific and that intraspecific variation in seed traits is likely associated with high phenotypic plasticity of species in response to local environmental heterogeneity. These findings should be considered at the time of implementation of conservation techniques and for seed sourcing decisions for restoration.

Original languageEnglish
Article number1790
JournalPlants
Volume12
Issue number9
DOIs
StatePublished - May 2023

Bibliographical note

Funding Information:
This research was funded by The Consejo de Investigación de la Universidad Nacional de Salta (grant number CIUNSa 2491/0) and by the Agencia Nacional para la Promoción Científica y Técnica (grant number PICT 2018-3588).

Publisher Copyright:
© 2023 by the authors.

Keywords

  • Anacardiaceae
  • arid environments
  • Fabaceae
  • interspecific variability
  • intraspecific variability
  • physical dormancy
  • physiological dormancy
  • Rhamnaceae
  • seed traits
  • water gap

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Plant Science

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