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Revista Brasileira de Fisiologia Vegetal
Print version ISSN 0103-3131
CARVALHO, PATRÍCIA GONÇALVES BAPTISTA DE et al. Temperature-dependent germination and endo-b -mannanase activity in sesame seeds. Rev. Bras. Fisiol. Veg. [online]. 2001, vol.13, n.2, pp.139-148. ISSN 0103-3131. http://dx.doi.org/10.1590/S0103-31312001000200003.
The effects of temperature on germination and endo-b-mannanase activity in seeds of Sesamum indicum was investigated. The minimum germination temperature (Tmin) lies between 12.8°C and 13.2°C while the maximum temperature (Tmax) is located between 45.5°C and 46°C. Germinabilities are statistically not different from estimated viability (88%) between 18.8°C and 43.2°C. The Mann-Whitney test indicated the interval 31.9°C to 35.1°C as the optimum temperature (Topt) range for germination rate. When seeds incubated at temperatures at or below the Tmin and close to or above the Tmax were transferred to 30°C, those incubated at lower temperatures achieved high germinability. On the other hand, the higher the pre-incubation temperature above Tmax, the lower the germinability achieved near Topt. Seed endosperm cell wall was found to contain mannose as the main monosaccharide. An increase in endo-b-mannanase activity in the micropylar endosperm prior to seed germination was observed only at supra-optimum temperature.
Keywords : endosperm; germination rate; sesame.