Abstract
Dimorphandra jorgei MF Silva (Caesalpinaceae) and Swartzia macrostachya Benth. var. riedelii Cowan (Fabaceae) are tree species from the southern Bahian Atlantic Forest, identified for the restoration of degraded areas. The objective of this research is to study their seed germination and seedling growth to develop simple methods for seedling production in small scale nurseries. Because the species have distinct dormancy and germination characteristics, the seeds were submitted to different treatments. D. jorgei seeds were immersed in hot water, scarified and stored for 12 weeks in the laboratory environment (25°C). S. macrostachya seeds were submitted to different combinations of drying and storage in the laboratory environment or refrigerator (4°C). Seedlings were submitted to two light treatments for 3 months: partial shade (52% of full sun) and full shade (12% of full sun). In D. jorgei, the highest germination occurred for scarified seeds (87%) and for seeds stored for 12 weeks and then scarified (69%). In S. macrostachya the undried control seeds had the highest germination, followed by that of the refrigeration storage treatment, without predrying (99% and 97%, respectively). The average values for the growth parameters were greater in full shade for D. jorgei, while S. macrostachya seedlings showed greater growth rates in partial shade. Two months growth is recommended before D. jorgei seedlings are of the sufficient size and leaf number for field planting. On the other hand, a period of 4 months is recommended for S. macrostachya, due to its relatively slow growth.
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Acknowledgments
The authors would like to thank the Fundação de Amparo à Pesquisa do Estado da Bahia (FAPESB) for financing the study, André Amorim and Edilma Pereira Gonçalves for help on the development of the project, Carlos Eduardo do Nascimento Cardoso for his support, and Drs. Alex-Alan F. de Almeida and Fatima C.M. Pina-Rodrigues for critiques made on the manuscript.
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Clifton-Cardoso, B.C., Mielke, M.S., De Melo, J.R. et al. Germination and seedling growth of Dimorphandra jorgei MF Silva and Swartzia macrostachya Benth. var. riedelii Cowan. New Forests 35, 15–31 (2008). https://doi.org/10.1007/s11056-007-9058-3
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DOI: https://doi.org/10.1007/s11056-007-9058-3