Study on the correlation between taxol，10-DAB of Taxus media and its major soil factors

Key words: 
• forest tree breeding /
• Taxus media /
• taxol content /
• 10-deacetylbaccatin Ⅲ（10-DAB） content /
• mineral elements content /
• partial correlation

Abstract: To know the difference of taxol，10-deacetylbaccatin Ⅲ （10-DAB） content of Taxus media at different site，about 500 g more branch and leaf of 10 individuals，2 500 g more soil each sampled from eight different domestic origins -Qiuchuang，Jingcheng，Dongwu，Renhe，Shanghu in Zhejiang，Tianpen in Sichuang，Luolong in Henan，Xiaotangshan in Beijing- were collected，the taxol and 10-DAB content were measured by high-performance liquid chromatography（HPLC），and soil mineral elements content and soil structure were determined by standard methods. Then，with the data，a stepwise multiple regression analysis by stepwise and a partial correlation analyses by the temperature when sampling as control variable were conducted. Results showed that taxol content decreased along the north latitude（north latitude from 285527 up to 401139，taxol content from 0.330 4 gkg－1 down to 0.030 6 gkg－1）. Also，taxol and 10-DAB were merely correlated with most soil factors；taxol was significantly（P＜0.031） and positively correlated （r = 0.800） with soil organic matter，but significantly （P＜0.047） and negatively correlated （r = － 0.761） with site north latitude；10-DAB was significantly （P＜0.026） and negatively correlated with mineral elements Co （r = 0.813） and Mn （P＜0.030，r = － 0.801）；there was no linear correlation between taxol and 10-DAB （r = － 0.197）；and the regression equation established was：y = 0.067 － 0.003 x1 + 0.000 012 08 x2 － 0.001 x3. Overall，taxol content，as a derivative of T. media，was similar to other Taxus species such as Taxus wallichiana var. mairei，with its content changing largely with soil organic matter.［Ch，2 fig. 3 tab. 23 ref.］