Dry seeds of the soybean (Glycine max (L.) Merrill) cultivars IAC-1,
IAC-3, Santa Rosa, Paraná, Davis, Hardee, Mineira, UFV-1, Viçoja, and of the
breeding line IAC-73-288 were submitted to 36, 40, 43 and 46°C during five days
to study the effects of temperature upon germination and the occurence of
cotyledon necrosis in the seedlings. Germination tests and necrosis evaluation
were carried just after temperature treatments and six months later. It was
observed a reduction in total germination and an increase in cotyledon necrosis as
higher temperatures were used. The cultivars IAC-1, UFV-1, and IAC-3 showed a
lower cotyledon necrosis index than the other cultivars and IAC-1, UFV-1, Viçoja
and Santa Rosa showed the best total germination. Storage for six months caused
a reduction in total germination and an overall increase in the necrosis index. It
was also observed a significant negative correlation between necrosis index just
after termical treatment of 43 and 46°C and the total germination.
1 Trabalho parcialmente financiado pela Fundação Cargill
2 Biologista do Instituto Agronômico de Campinas. Bolsista do CNPq
3 Pesquisadores Científicos do Instituto Agronômico de Campinas. Bolsistas do CNPq