H. Yasufuku et al., CHANGE OF WATER-SOLUBLE ARABINOGALACTAN-PROTEINS OF CABBAGE ACCOMPANYING ITS GROWTH .5. WATER-SOLUBLE GLYCOCONJUGATES OF VEGETABLES, Bioscience, biotechnology, and biochemistry, 58(2), 1994, pp. 225-229
Changes in water-soluble arabinogalactan-proteins (AGPs) in cabbages a
t five stages (I, seedlings with cotyledon; II, young seedlings with f
ive to six leaves; III, initiation of head formation; IV, completion o
f head formation; V, flower stalk development) during the course of de
velopment were investigated. The results indicate that only the white
head portion contained the higher molecular weight AGP (A-I) together
with the lower molecular weight AGP (A-II) with the largest at stage I
V. On the other hand, green leaves contained only A-II and its content
decreased rapidly with progress of growth from stage I to stage IV. T
he chemical composition analyses also showed that the hydroxyproline c
ontent decreased significantly with growth. Based on these results, we
concluded that cabbage leaves contained water-soluble AGPs throughout
the growth of cabbage and AGP A-I was specific for head formation of
cabbage.