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Controlled seed deterioration in Dalbergia nigra and Dimorphandra mollis, endangered Brazilian forest species

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This work aimed to study controlled seed deterioration in endangered Brazilian forest species »Jacaranda-dabahia« (Dalbergia nigra (Vell.) Fr. All. Ex Benth., Fabaceae, Atlantic Forest) and "Faveiro" (Dimorphandra mollis Benth., Caesalpiniaceae, "Cerrado"). The knowledge of those species' storability could assist seed conservation and availability. Seed moisture content (mc) was adjusted from initial values either by rehydration above water or by dehydration over silica gel. Seed subsamples of eleven mc for D. nigra (2.5, 2.8, 4.6, 5.3, 7.1, 9.5, 13.3, 14.3, 15.1, 17.4, 18.5%) and eight mc for D. mollis (1.6, 5.2, 6.9, 8.4, 9.2, 10.6, 11.4, 13.2%) were hermetically stored at 40, 50 and 65°C (±0.5°C), until complete survival curves were achieved. Both species had orthodox behaviour during storage, although D. mollis presented higher storability, probably due to hardseededness and different seed composition. An inverse relationship was observed between mc and seed longevity for the species. Viability constants for D. nigra and D. mollis were: KE = 5.199, 6.282; CW = 4.524, 3.838; CH = 0.08175, 0.05405; CQ = 0.001641, 0.001316. Lowest mc limits for application of the viability equation at 65°C appeared to be around 2.9 and 4.0% mc for D. nigra and D. mollis, respectively.
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Document Type: Research Article

Publication date: October 1, 2004

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  • Seed Science and Technology (SST) is one of the leading international journals featuring original papers and review articles on seed quality and physiology as related to seed production, harvest, processing, sampling, storage, distribution and testing. This widely recognised journal is designed to meet the needs of researchers, advisers and all those involved in the improvement and technical control of seed quality.
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