Mutual Allelopathy Research On Rehmanniae And Sesame

Rehmanniae, a kind of allelopathic medicinal plant, it had two thousand years cropping history. This plant was first grown in Jiaozuo city of Henan province. As an important oil plant, Sesame was mainly planted in Henan province. Annual planting area and yield were0.313million hektare and0.112million ton separately, account28%yield for all country. There are some problems that it was not suitable to crop sesame after planting Rehmanniae. In order to further understand the allelopathy of rehmanniae on sesame, the potential allelochemicals of rehmannia was isolated and identified with thin layer chromatography and GC-MS in this paper. Through these experiments, we got several important conclusions below:(1) It was found that the changes of the soil microbial quantity were almost the same in different phases and different growing period.(2) It was found that the changes of the hydrogen peroxidase activity were almost the same, and appeared peak value in the thirtieth day and the seventy-fifth day, and the urease activity too.(3) With thin layer chromatography and GC-MS, Alkanes, define aldehydes, aldehydes, ketones and lipids etc., were identified from the soil of rehmannia root, and Olefine aldehydes, was considered as potential allelochemicals, play a strong inhibitory effect on the root and bud of sesame.(4) The first systematic chemical experiments were made from sesame seedling in this paper; and sugar, organic sugars, saponins, flavonoids, phenol, cariac glycosides, alkaloids and volatile oil etc., were determined primarily as potential chemicals. It will play an important role in future research of allelopathy and agricultural department.(5) Field trials showed that sesame play a strong inhibitory effect on rehmannia, and sesame seedlings and sesame leaves play the strongest effect.