Galactose Inhibition of Auxin-Induced Growth of Mono- and Dicotyledonous Plants 1
AUTOR(ES)
Yamamoto, Ryoichi
RESUMO
Galactose inhibited auxin-induced cell elongation of oat coleoptiles but not that of azuki bean stems. Galactose decreased the level of UDP-glucose in oat coleoptiles but not in azuki bean hypocotyls. Glucose-1-phosphate uridyltransferase activity (EC 2.7.7.9), in a crude extract from oat coleoptiles, was competitively inhibited by galactose-1-phosphate, but that enzyme from azuki bean was not. A correlation was found between inhibition of growth by galactose and inhibition of glucose-1-phosphate uridyltransferase activity by galactose-1-phosphate using oat, wheat, maize, barley, azuki bean, pea, mung bean, and cucumber plants. Thus, it is concluded that galactose is converted into galactose-1-phosphate, which interferes with UDP-glucose formation as an analog of glucose-1-phosphate.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1054655Documentos Relacionados
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