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Lin S.,Fuzhou University | Lin S.,Provincial Key Laboratory of Agroecological Processing and Safety Monitoring | Huangpu J.,Provincial Key Laboratory of Agroecological Processing and Safety Monitoring | Chen T.,Fuzhou University | And 7 more authors.
International Journal of Agriculture and Biology | Year: 2014

Pseudostellariae heterophylla has the problem of continuous cropping obstacle resulting in significant reductions in yield and quality. In this study, different cropping patterns were designed to investigate the effects on the physiology, yield and medicinal quality of P. heterophylla. Continuous cropping resulted in significant decline in the production and quality, the output and pharmacological components of two-year monoculture than of one-year monoculture of P. heterophylla. Compared with two-year monoculture, the rice -P. heterophylla and bean -P. heterophylla rotation increased the production and pharmacological components of P. heterophylla. These rotation patterns improved the photosynthetic capacity of P. heterophylla, and reduced the activity of protective enzymes and malondialdehyde content of P. heterophylla. The results indicated that rotation cropping can alleviate continuous cropping obstacles and improve the yield and quality of P. heterophylla. The rice- P. heterophylla rotation is more effective than bean- P. heterophylla to abate the continuous cropping obstacles of P. heterophylla. © 2014 Friends Science Publishers. Source


Lin S.,Fuzhou University | Lin S.,Provincial Key Laboratory of Agroecological Processing and Safety Monitoring | Dai L.,Fuzhou University | Dai L.,Provincial Key Laboratory of Agroecological Processing and Safety Monitoring | And 8 more authors.
International Journal of Agriculture and Biology | Year: 2015

Pseudostellariae heterophylla, an important medicinal plant, has been shown to suffer from serious replanting disease that causes significant declines in both yield and quality. The objective of this study was to isolate the soil-born pathogen and antagonistic microorganism for investigation of the relationship between these microorganism and consecutive monoculture problems of P. heterophylla. In this study, we isolated the bacteria with different morphology from P. heterophylla rhizosphere soil, detected the pathogenicity of these bacteria to P. heterophylla plantlet and antagonistic ability to Fusarium of P. heterophylla biotype, identified their species and analyzed their abundance with qRT-PCR in rhizosphere soil of different planting years. We isolated Enterobacter sp1 and Burkholderia sp1 from P. heterophylla rhizosphere soil, and found Enterobacter sp1 possessed the pathogenicity to P. heterophylla plantlet and Burkholderia sp1 was antagonistic for Fusarium of P. heterophylla biotype. However, Burkholderia sp1 was not the antagonistic microorganism to Enterobacter sp1. The growth of Enterobacter sp1 was stimulated by phenolic acids at a certain concentration nearly closed to that in P. heterophylla rhizosphere soil, which increased as planting years of P. heterophylla increased. On the contrary, the phenolic acids had no promoting effect on the growth of Burkholderia sp1. And with the increase of planting years, the abundance of Burkholderia sp1 decreased and abundance of Enterobacter sp1 increased in the P. heterophylla rhizosphere soil. The results indicated that harmful microorganisms increase and beneficial microorganisms decrease, which were mediated by the accumulated autotoxins in rhizosphere soil of consecutively monocultured P. heterophylla, and hence leads to the imbalance of microbial community structure and the degradation of soil ecological function. So several abatement methods, such as crop rotation, specific microbial fertilizer and organic matter, could be used to improve the structure and functional diversity of microbial community, and overcome the obstacles of continuous cropping. © 2015 Friends Science Publishers. Source

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