Equações de viabilidade para sementes de Eucalyptus grandis W.Hill ex Maiden e Pinus taeda L

AUTOR(ES)

Jussara Bertho Fantinatti

DATA DE PUBLICAÇÃO

2004

RESUMO

The knowledge of seed performance under storage conditions is extremely important to determine its storability potential. The main aim of this work was determine the best methodology to achieve the survival and preservation of Eucalyptus grandis W.Hill ex Maiden and Pinus taeda L. seeds, under controlled storage conditions, through the detection of the viability equation constants for the species. The seeds used in this experiment were harvested in 1999 (E. grandis) and 2000 (P. taeda). Before the storage period, the seeds were rehydrated over water and or dried over silica gel, both at 25°C, ITominitial moisture contents, until achieving the desired values. Seed subsamples with 8 moisture contents for E. grandis (1.2 to 18.1%, initial value of 11.3%) and 8 moisture contents for P. taeda (1.4 to 19.4%, initial value of 12.3%) were then sealed in laminate aluminium-foil packets and stored in incubators maintained at 40, 50 and 65°C. Those storage temperatures were chosen in order to get complete survival curves in relatively short periods of time. Statistical analysis was performed through Glim software. The two species showed orthodox behaviour in relation to the storage, however E. grandis seeds presented higher storability than P. taeda ones. Two different viability eonstant sets were aehieved to predict the longevity of Eucalyptus grandis and Pinus taeda seeds, as follows:KE= 9.661 and 8.838; Cw= 6.467 and 5.981; CH= 0.03498 and 0.10340; CQ = 0.0002330 and 0.0005476, respectively. An inverse relationship was observed between the water content and seed longevity for both species. The lowest limits estimated for applieation ofthe viability equation for E. grandis and P. taeda were 4.85 and 4.06 me, respectively, in equilibrium with 20% RH

ASSUNTO(S)

sementes - deterioração longevidade eucalipto pinus taeda sementes - viabilidade sementes - armazenamento

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