Seed germination of Bromelia serra (Bromeliaceae): effects of the canopy openness where the mother plant lived and the light environment of the germination place
Rodrigo M. Freire
A * , Graciela N. Klekailo A , Jorgelina P. Asmus A B , Ángeles Tessore A , Andrés Cococcioni A , Verónica Albute A and Ignacio M. Barberis A B
+ Author Affiliations
- Author Affiliations
A Facultad de Ciencias Agrarias, Universidad Nacional de Rosario, Campo Experimental Villarino, C.C. 14, S2125ZAA Zavalla, Santa Fe, Argentina.
B IICAR (Instituto de Investigaciones en Ciencias Agrarias de Rosario), Universidad Nacional de Rosario–Consejo Nacional de Investigaciones Científicas y Técnicas, Zavalla, Argentina.
Australian Journal of Botany 71(1) 1-11 https://doi.org/10.1071/BT21152
Submitted: 22 December 2021 Accepted: 2 December 2022 Published: 3 February 2023
© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing
Abstract
Context: Some plant species show within-generational and trans-generational phenotypic plasticity associated with the light environment for germination traits. In bromeliads, light affects the seed germination of several species, but there is no study analysing the effects of the light environment where the mother plant lived on seed germination. Bromelia serra inhabits the understorey of xerophytic forests, where individuals could be conditioned by the heterogeneous light environment because its cover and abundance are negatively associated with tree basal area and woody vegetation cover.
Aims: To analyse the effect of the light environment on seed germination of B. serra, considering also the light environment where the mother plant lived.
Methods: In four patches from three different sites in a stand of a Schinopsis balansae forest, 48 fruiting plants of B. serra were harvested. Canopy openness was obtained from a hemispherical photograph taken above each plant. From each infructescence, half of the seeds from five fruit were kept in light conditions and the remaining seeds in dark conditions in a germination room.
Key results: There was no effect of the light environment where mother plants lived on seed germination, but the light environment in the germination room positively affected germination variables.
Conclusions: The positive effect of light on seed germination of B. serra might explain the spatial distribution of individual plants in these xerophytic forests.
Implications: These results have enhanced our understanding of the regeneration and distribution of understorey herbaceous species in these South American forests.
Keywords: bromeliad, forest, germination, light, maternal effects, phenotypic plasticity, quebrachal, trans-generational plasticity, within-generational plasticity.
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