科研之友
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摘要
Pinellia ternata (Thunb.) Breit. is a common traditional Chinese medicine. The continuous cropping obstacle (CCO) lowers both the quality and yield of P. ternata, thereby hindering the sustainable development of the planting industry. The underlying mechanism involves soil acidification, a decline in soil enzyme activity, and nutrient imbalance induced by the CCO of P. ternata. Particularly, phenolic acids are the main allelochemicals, while some quinones, aldehydes, and ketones are special allelochemicals present in P. ternata. These allelochemicals inhibit seed germination, seedling growth, and lead to an increase in pathogens in the rhizospheres of P. ternata. In addition, the continuous cropping of P. ternata results in a decrease in microbial diversity. Pathogens such as Fusarium, Klebsiella oxytoca, and Pectobacterium carotovorum were found to increase after continuous cropping of P. ternata. At present, reported measures to alleviate the CCO of P. ternata include rotation and intercropping, soil and tuber sterilization, microbial agents, and application of organic materials. However, these measures have some shortcomings, such as a long operation cycle, high cost, difficulty in operation, unclear mechanism, and instability of effectiveness. Therefore, to better alleviate the CCO of P. ternata, the plant rhizosphere secretions (such as allelochemicals), rhizosphere soil and microbial community should be considered as a whole system, and the interactions among them should be studied in depth to better explain the causes of CCO. Moreover, research on the mitigation techniques and mechanisms of the CCO of P. ternata should be further expanded to provide theoretical and technical guidance for promoting and guaranteeing the sustainable development of P. ternata planting industry.
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单位中国科学院; 中国科学院大学
