Study on Variation and Inheritance of Phenolic Compound Concentrations in Magnolia officinalis of Different Seed Sources

Concentrations of magnolol and honokiol contained in 39 bark samples of 13 seed sources from a five-year-old provenance test plantation were determined by means of HPLC.It’s concluned that such quality characteristics as concentrations of magnolol and honokiol,the total concentration of phenolic compounds in Magnolia officinalis,and the proportion of magnolol to honokiol differ significantly or most significantly among various seed sources.Phenolic compounds from the seed source of west of Hubei,the leaf of which has a tip,are the highest in concentrations,with those from the seed source of Mt.Lushan,the leaf of which is concave in the tip,being the lowest.The total concentration of the former is 10.34 times as high as that of the latter.The four quality characteristics are all genetically controlled intensely.The heritabilities of the seed sources of various characters are from to 0.7585～0.9465.Geographic variation of various characters is in dual directions,longitudinal and latitudinal,with longitudinal variations being dominant.