A PRELIMINARY STUDY ON THE RELATION OF THE CHEMICAL COMPOSITIONS IN THE BARK OF POPLAR TO DOTHIORELLA GREGARIA SACC.——Ⅰ. THE RELATION OF THE MACRONUTRIENTS TO D. GREGARIA SACC.
摘 要 ：本文应用统计分析方法对毛白杨(Populus tomentosa Carr.)、加拿大杨(P.X euramericana(Dode)Guinier)、箭杆杨(P.nigra var. thevestina)。树皮中常量营养元素与溃疡病(Dothiorella gregaria Sacc.)的关系进行了初步研究。相关分析和主成分分析的结果表明,杨树溃疡病菌分生孢子的萌发率和菌落生长量与氮、硫、磷、钙、镁含量成负相关,与钾含量成正相关,其中以氮的影响最为显著。同时,在二维空间对样本进行分类,其结果表明不同杨树树种之间6种常量元素含量及对溃疡病抗性的差异十分明显,从而为早期选育抗病品种提供了理论依据。
Abstract:A preliminary study on the relation of the macronutrients in the bark of Populus tomentosa Carr., P.×euramericana(Dode) Guinier, P. nigra var. thevestina to Dothiorella gregaria Sacc. was carried out by using statistical analysis. The results of correlation analysis as well as principal component analysis show that the percentage of conidia germination of D. gregaria Sacc. and colony growth appear to be negative correlation with nitrogen, sulphur, phosphorus, calcium and magnesium, and to be positive correlation with potassium, nitrogen the effect of which is the most significant. Futhermore, the results from two-dimensoinal classification of samples show that there are significant differences in the contents of six macronutrients and the resistance to D. gregaria Sacc. amoug various poplar species, thus providing the theoretical basis for selecting poplar varieties with strong resistance to D. gregaria Sacc. In the early stage.