Effects of consecutively monocultured rehmannia glutinosa l. on diversity of fungal community in rhizospheric soil
Zhang Zhongyi, Engineering Research Center of Chinese Medicinal Materials,Beijing(China) | Lin Wenxiong, Engineering Research Center of Chinese Medicinal Materials,Beijing(China) | Yang Yanhui, Engineering Research Center of Chinese Medicinal Materials,Beijing(China)
Continuous monoculture problems, or replanting diseases, are one of the key factors affecting productivity and quality ofChinese medicinal plants. The underlying mechanism is still being explored. Most of the studies on continuous monocultureof Rehmannia glutinosa L. are focused on plant nutritional physiology, root exudate, and its autotoxicity. However, thechanges in the diversity of microflora in the rhizosphere mediated by the continuous monoculture pattern have beenremained unknown. In this study, terminal restriction fragment length polymorphism (T-RFLP) technique was used forfingerprinting fungal diversity in the rhizosphere soil sampled from the fields of R. glutinosa monocultured for 1 and 2 yr. Theresults showed that the structure of fungal community in consecutively moncultured rhizosphere soil was different fromthat in control soil (no cropping soil), and varied with the consecutive monoculture years (1 and 2 yr). The comprehensiveevaluation index (D) of fungal community estimated by principal component analysis of fragment number, peak area,Shannon-Weiner index, and Margalef index was higher in 1 yr monoculture soil than that in 2 yr monoculture soil,suggesting that consecutive monoculture of R. glutinosa could be a causative agent to decrease the diversity of fungalcommunity in the rhizosphere soil.
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