| Illicium verum is one of the most important non-wood species in Guangxi, and it has the highest shikimate content in all of the plants. Shikimic acid (SA) is one of the major components for the anti-bird flu drugs. Analysis of the SA content in I. verum from various habitats can improve I. verum's breeding techniques and economic efficiency, provide a theoretical support for the selection of raw materials for SA extraction, and offer a foundation for realizing the sustainable development of forestry.The domestic and foreign research progress of I. verum and the SA were summarized in this article. Based on the theory on biology, physiology and ecology, the SA content of the fresh fruits of I. verum from 11 different places in Guangxi were analyzed. The results are shown as follows:1. The plant materials were sampled in three different seasons of July, October and January from Gaofeng forest farm. The analysis results showed that the SA content was significantly varied in different seasons, the SA content of the summer samples was the highest (12.978%), the second highest was the spring samples (9.329%), and the content of autumn samples was the lowest (7.643%).2. In the three fruiting periods of I. verum, the SA content of fruit from the tree in mature period was the highest, the mean was 13.214%; the juvenile tree in the early fruiting period ranged next, the mean was 10.773%, the values of all physiological indexes were declined because of the aging of organs and the SA content in senile tree was the lowest, which was 9.443%. The SA content had no significant difference in different varieties of I. verum. With the change of growth periods, the variation curves of SA content in the light red flower variety, red flower variety and white flower were quite similar.3. With the changes in latitude, the difference of SA in I. verum was significantly great. In the same sampling time, as the latitude changes from south to north, the SA contents in I. verum plants increased.4. The content of SA was in a negative correlation with the altitude, but the correlation coefficient was low (R=-0.455). There were no significant differences in the contents of SA.5. The nutrition management level had significant effect on the content of SA. The fruits from intensive management had the highest SA content. As the management level declined, the content of SA decreased. The analysis showed that the content of SA was highly correlative with soil organic matter content, pH scale, total nitrogen content, rapidly available nitrogen content, available kalium content and the effective boron content, the correlation coefficient was 0.908,0.822,0.810,0.894,0.812, and 0.886, respectively; and the correlation was significant with the available phosphor content (R=0.783). It was also found that the SA content had significant correlation with the nitrogen content in leaves (R=0.972), which was the highest index of all the elements in leaves, and followed by kalium (R=0.951), boron (R=0.923) and phosphor (R=0.675). The content of SA can be estimated by monitoring the elements of N, K, B in the leaves of I. verum in the future.
|
PDF Full Text Request