Fire-type heat increases the germination of Cistaceae seeds in contrast to summer heat
Tóm tắt
Our analyses of data in Luna et al. (Fire Ecology 19:52, 2023) do not support the proposal that dormancy release of the hard seeds in 12 species of Cistaceae is a “two-step process” involving high summer temperatures followed by fire-type heat. The reverse is true: subjection to a month of daily alternating temperatures of 50/20 °C (summer heat) is more likely to induce dormancy among initially soft seeds or secondary dormancy among those softened by fire heat or reduce the ability of fire heat to soften the seeds. The need to inspect seeds for the presence of an open “water gap” following various heat treatments, and using more realistic summer temperatures in future studies, is clear.
Tài liệu tham khảo
Brits, G.J. 1986. Influence of fluctuating temperatures and H2O2 treatment on germination of Leucospermum cordifolium and Serruria florida (Proteaceae) seeds. South African Journal of Botany 52: 286–290.
Castro, J., and A.T. Romero-García. 1999. Dormancy and germination in Cistus clusii (Cistaceae): Effect of biotic and abiotic factors. Revue D’ecologie, Terre Et Vie 54: 19–28.
Dias, S.L., P.I. Pereira, and S.A. Dias. 2019. Seed germination in Cistus ladanifer: Heat shock, physical dormancy, soil temperatures and significance to natural regeneration. Plants 8: 63.
Gama-Arachchige, N.S., J.M. Baskin, R.L. Geneve, and C.C. Baskin. 2013. Identification and characterization of ten new water gaps in seeds and fruits with physical dormancy and classification of water-gap complexes. Annals of Botany 112: 69–84.
Hagon, M.W., and L.A.T. Ballard. 1970. Reversibility of strophiolar permeability to water in seeds of subterranean clover (Trifolium subterraneum L). Australian Journal of Biological Sciences 23: 519–528.
Lamont, B B., and J G. Pausas. 2023. Seed dormancy revisited: Dormancy-release pathways and environmental interactions. Functional Ecology 37: 1106–1125.
Lamont, B.B., G.E. Burrows, and D. Korczynskyj. 2022. High summer temperatures do not interact with fire to promote germination among seeds of Cistaceae: A reinterpretation of Luna (2020) with extra data on wet/dry conditions. Plant Ecology 223: 141–149.
Luna, B. 2020. Fire and summer temperatures work together breaking physical seed dormancy. Science and Reports 10: 1–10.
Luna, B., P. Piñas-Bonilla, G. Zavala, and B. Pérez. 2023. Timing of fire during summer determines seed germination in Mediterranean Cistaceae. Fire Ecology 19 (1): 52.
Moreira, B., and J.G. Pausas. 2012. Tanned or burned: The role of fire in shaping physical seed dormancy. PLoS ONE 7 (12): e51523.
Sánchez, A.M., A.L. Luzuriaga, A.L. Peralta, and A. Escudero. 2014. Environmental control of germination in semi-arid Mediterranean systems: The case of annuals on gypsum soils. Seed Science Research 24 (3): 247–256.