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Type: Artigo de periódico
Title: Controlled seed deterioration in Dalbergia nigra and Dimorphandra mollis, endangered Brazilian forest species
Author: Chaves, MMF
Usberti, R
Abstract: 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 (me) was adjusted from initial values either by rehydration above water or by dehydration over silica gel. Seed subsamples of eleven me for D. nigra (2.5, 2.9, 4.6, 5.3, 7.1, 9.5, 13.3, 14.3, 15.1, 17.4, 18.5%) and eight me 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 65degreesC (+/-0.5degreesC), 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 me and seed longevity for the species. Viability constants for D. nigra and D. mollis were: K-E = 5.199, 6.292; C-W = 4.524, 3.838; C-H = 0.08175, 0.05405; C-Q = 0.001641, 0.001316. Lowest mc limits for application of the viability equation at 65degreesC appeared to be around 2.9 and 4.0% mc for D. nigra and D. mollis, respectively.
Country: Suíça
Editor: Ista-int Seed Testing Assoc
Rights: fechado
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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