%0 Journal Article
%T Temperature-dependent germination and endo-beta -mannanase activity in sesame seeds
%A CARVALHO
%A PATR¨ŞCIA GONŁżALVES BAPTISTA DE
%A BORGHETTI
%A FABIAN
%A BUCKERIDGE
%A MARCOS SILVEIRA
%A MORHY
%A LAURO
%A FERREIRA FILHO
%A EDIVALDO XIMENES
%J Revista Brasileira de Fisiologia Vegetal
%D 2001
%I Scientific Electronic Library Online
%R 10.1590/S0103-31312001000200003
%X 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 12.8ˇăc and 13.2ˇăc while the maximum temperature (tmax) is located between 45.5ˇăc and 46ˇăc. germinabilities are statistically not different from estimated viability (88%) between 18.8ˇăc and 43.2ˇăc. the mann-whitney test indicated the interval 31.9ˇăc to 35.1ˇăc 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 30ˇăc, 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.
%K endosperm
%K germination rate
%K sesame.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0103-31312001000200003&lng=en&nrm=iso&tlng=en