ISHS Acta Horticulturae 813: VI International Symposium on New Floricultural Crops
ABAXIAL AND ADAXIAL SURFACES OF SPATHE TISSUE OF ZANTEDESCHIA DIFFER IN THEIR PATTERN OF RE-GREENING |
| Authors: | J. Chen, K.A. Funnell, D.J. Woolley, D.H. Lewis, J.R. Eason |
| Keywords: | Spectrophotometric a/b ratio, chlorophyll, carotenoid, cut flower, postharvest quality |
| Abstract:
Re-greening of spathe tissue is a primary determinant limiting the post harvest quality of Zantedeschia as both a cut flower and pot plant. In the absence of any detailed description of the pattern of re-greening in Zantedeschia hybrids, the changes in spectrophotometric a/b ratio, pigment concentration and plastid differentiation in both abaxial and adaxial surface of the spathe were investigated using a model system of discs of spathe tissue. For the cultivar ‘Best Gold’, the a/b ratio of the adaxial surface decreased over time from harvest maturity at a slower rate than that of the abaxial surface. Re-greening in the abaxial surface of spathe tissue was concomitant with the increase in chlorophyll a and chlorophyll b, while no chlorophyll was detected in adaxial surface over the 14-day period of re-greening. For both surfaces, total carotenoids decreased as re-greening proceeded, but re-greening primarily resulted from chlorophyll masking the carotenoids present. During development of the spathe from green-bud to fully re-greened, plastids re-differentiated from chloroplast to chromoplasts to chloroplast on the adaxial surface, while plastids differentiated from proplastid to chromoplast on the abaxial surface. | |
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