Floral ontogeny of two species of Knema and one of Horsfieldia were examined and described with scanning electron microscopy (SEM). The perianth is trimerous with three tepals arising in succession. Pistillate flowers...
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Floral ontogeny of two species of Knema and one of Horsfieldia were examined and described with scanning electron microscopy (SEM). The perianth is trimerous with three tepals arising in succession. Pistillate flowers have a rounded floral apex with convex top. The single carpel primordium initiates along the margin of the bud? and develops a plicate? shape with apical bilobed stigma. In staminate flowers, the floral apex is broadly round with a somewhat three-side shape. Several anther primordia are initiated almost simultaneously around the margin of the floral apex, but the initiating sequence could not be determined with certainty. The alternitepalous stamens were found to be different from the antetepalous stamens, which are pressed within a limited space. The anther primordia remain adnate to the receptacle and grow longitudinally, producing a pair of microsporangia. The central area of the floral apex persists as an undifferentiated residuum without trace of any gynoecium. The myristicaceous anthers are basically homologous, although the number of anthers, pollen sacs and shape of the androecium are variable. The tendency of reduction in anther number in this family as a general and Myristicaceae much more recent than Annonaceae are acceptable.
The flavone content in leaves and inflorescence of 48 accessions (including 196 plants) of the F. cymosum complex native to Guizhou, Yunnan, Sichuan, Hunan, Hubei, and Tibet were studied under the same cultivated circ...
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The flavone content in leaves and inflorescence of 48 accessions (including 196 plants) of the F. cymosum complex native to Guizhou, Yunnan, Sichuan, Hunan, Hubei, and Tibet were studied under the same cultivated circumstances by means of the absorptionphotometry. The results showed that there are significant differences of flavone content among different species, among different accessions, and among different plants. The average flavone content of leaves of *** (6.41%) is higher than those of F. pilus (4.32%) and of *** (5.91%), and the average flavone content (12.22%) of inflorescences of *** is also higher than that of F. pilus ( 9.43%). The results also showed that the flavone content in inflorescence was significantly higher than that in leaves, and they have significant positive relationship. The leaf and inflorescence of *** plants have the average rutin content 4.08% with the range of 2.28 %~ 6.35 % and 9.05% with the range of 6.84 %~ 12.69 %,respectively. There is much significant difference of rutin contents between leaves and inflorescences, but there is no significant relationship between them. There is no significant relationship between leaf rutin contents and leaf flavone contents, but significant positive relationship between inflorescence rutin contents and inflorescence flavone contents.
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