GLUCOSE-6-PHOSPHATE AND UDP-D-GLUCOSE DEHYDROGENASES - POSSIBLE MARKERS OF VASCULAR DIFFERENTIATION

quantitative cytochemical study of intact root apices and wounded root s of Pisum sativum, and of cotyledons from Solanum aviculare induced t o form vessels from mesophyll cells, has demonstrated a sharp increase in glucose-6-phosphate dehydrogenase activity at a very early stage i n the differentiation of the vascular tissues, However, UDP-D-glucose dehydrogenase activity appears to increase only at a time correspondin g to the initiation of secondary cell wall events, Data from the callu s cultures from Malus M27 and Cox endosperm indicated that glucose-6-p hosphate dehydrogenase activity changes may be a possible marker for d etermining between the regenerability and recalcitrance of calluses. ( C) 1997 by John Wiley & Sons, Ltd.