Chemical composition and physiological quality of soybean seeds

O presente trabalho teve por objetivo estabelecer rela????o entre a variabilidade da composi????o qu??mica e a qualidade fisiol??gica de sementes de soja. Foram empregados tr??s lotes de sementes de soja, cultivares Tabarana, Tucunar?? e Monsoy 8866. Foram realizados os testes de germina????o e de emerg??ncia de pl??ntulas e de tetraz??lio e determina????es dos teores de ??leo, prote??na e ??cidos graxos livres. O lote 3 da cultivar Tabarana apresentou maior germina????o comparativamente aos demais. Pelo teste de tetraz??lio, a viabilidade de sementes foi similar entre lotes e cultivares. A maior emerg??ncia de pl??ntulas verificou-se no lote 3 da cultivar Tabarana. Os teores de ??leo, prote??na e ??cidos graxos livres em sementes de soja foram vari??veis entre lotes e refletiram em diferen??a m??dia entre cultivares. O teor de prote??na foi maior em sementes da cultivar Tabarana e o teor de ??leo apresentou maior valor nas sementes da cultivar Monsoy 8866. O n??vel de ??cidos graxos livres foi inferior na cultivar Tucunar??. A composi????o qu??mica de sementes ?? vari??vel entre cultivares e lotes e apresenta rela????o com a qualidade fisiol??gica de sementes de soja.This work aimed to establish the relationship between the variability of chemical composition and physiological quality of soybean seeds. Three lots were used for the cultivars Tabarana, Tucunar?? and Monsoy 8866. The analyzes were germination, seedling emergence, tetrazolium test, oil content, protein and free fatty acids. The lot 3 of Tabarana cultivar presented higher germination compared to the others. By the tetrazolium test, the seed viability was similar between lots and cultivars. The seedling emergence was higher in Tabarana cultivar and also from seeds of lot 3. The contents of protein, oil free fatty acids in soybean seeds were variable between lots and reflected in the average difference between cultivars. The protein content was higher in Tabarana cultivar and oil content showed higher value in cultivar Monsoy 8866. The free fatty acids was lower in seeds of Tucunar?? cultivar. The chemical composition varies among seed cultivars and lots, maintaining relationship the quality of soybean seeds