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| Research on sugar metabolism regular of flowering Chinesecabbage varieties with different maturity cultivars |
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| Abstract: |
| The sugar metabolism regular were studied in flowering Chinese cabbage with different maturitycultivars
（Early maturity cultivar，Mid maturity cultivar，Late maturity cultivar）. The results indicated that the contents of
soluble sugar，sucrose，fructose and reducing sugar had little change in three type of cultivars from early to middle stage
of flower bud differentiation，butincreased rapidly from middle stage of flower bud differentiation to budding stage，and
gone steadily up or down from budding to harvest stage. After flower bud differentiation，all kinds of sugar contents in
the leaves were lower than those in the stems. The contents of sugars both in leaves and stems in the latematuritycultivar
were the highest among three type of cultivars，and had no significant difference in the leaves between early and mid
maturity cultivar，but the sugar contents in the stems of the mid maturity cultivar were higher than those in early maturity
cultivar. There were significant positively correlations between neutral invertase（NI）and acid invertase（AI）
activities in the leaves as well as sucrose synthase（SS）andsucrose phosphate synthase（SPS）activities in the stems
andthe contents of soluble sugar，sucrose，fructose and reducing sugar；while there were not significant correlations
between SS and SPS activities in leavesas well as NI and AI activities in the stems and the contents of soluble sugar，
sucrose，fructose and reducing sugar. This illustrated that sugar accumulation was the fastest from middle stage of
flower bud differentiation to budding stage. After flower bud differentiation，the sugars gradually transported from leaves
to stems for providing enough energy for flower stalk
growing. During the whole growing stage，sugars in the
leaves continuously degraded，but those in the stems
continuously synthesized and accumulated. The sugar
contents and activities of NI and AIin leaves as well as
sugar contents and activities of SS and SPS in stem had
close relationships. Therefore，higher activities of SS and
SPS in stems could promote the accumulation of sugars，
and improve flower stalk quality. |
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