A semimicroquality evaluation method on Panax notoginseng and its application in analysis of continuous cropping obstacles research samples

2016 ◽  
Keyword(s):  
Evaluation Method ◽  
Panax Notoginseng ◽  
Continuous Cropping

Characteristics of soil microflora of Panax notoginseng in different continuous cropping years

2018 ◽  
Vol 44 (2) ◽  
pp. 145-158 ◽  
Author(s):  
H.J. Liu ◽  
X.Y. Yang ◽  
Z.Q. Miao ◽  
S.D. Li ◽  
Y.H. Chen ◽  
...  
Keyword(s):  
Panax Notoginseng ◽  
Soil Microflora ◽  
Continuous Cropping

scholarly journals Key soil parameters affecting the survival of Panax notoginseng under continuous cropping

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Wumei Xu ◽  
Fengyun Wu ◽  
Haoji Wang ◽  
Linyan Zhao ◽  
Xue Liu ◽  
...  
Keyword(s):  
Soil Ph ◽  
Pearson Correlation ◽  
Principal Component ◽  
Panax Notoginseng ◽  
Soil Parameters ◽  
Continuous Cropping ◽  
Poor Growth ◽  
Available N ◽  
The Poor ◽  
Replant Problem

AbstractNegative plant-soil feedbacks lead to the poor growth of Panax notoginseng (Sanqi), a well-known herb in Asia and has been used worldwide, under continuous cropping. However, the key soil parameters causing the replant problem are still unclear. Here we conducted a field experiment after 5-year continuous cropping. Sanqi seedlings were cultivated in 7 plots (1.5 m × 2 m), which were randomly assigned along a survival gradient. In total, 13 important soil parameters were measured to understand their relationship with Sanqi’s survival. Pearson correlation analysis showed that 6 soil parameters, including phosphatase, urease, cellulase, bacteria/fungi ratio, available N, and pH, were all correlated with Sanqi’s survival rate (P < 0.05). Principal component analysis (PCA) indicated that they explained 61% of the variances based on the first component, with soil pH being closely correlated with other parameters affecting Sanqi’s survival. The optimum pH for Sanqi growth is about 6.5, but the mean soil pH in the study area is 5.27 (4.86–5.68), therefore it is possible to ameliorate the poor growth of Sanqi by increasing soil pH. This study may also help to reduce the replant problem of other crops under continuous cropping since it is widespread in agricultural production.

scholarly journals Impact of continuous Panax notoginseng plantation on soil microbial and biochemical properties

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Yu Zhang ◽  
Yujie Zheng ◽  
Pengguo Xia ◽  
Lulu Xun ◽  
Zongsuo Liang
Keyword(s):  
Crop Rotation ◽  
Management Practices ◽  
Panax Notoginseng ◽  
Biochemical Properties ◽  
Continuous Cropping ◽  
Soil Enzyme Activities ◽  
Soil Microbial ◽  
Fallow Soil ◽  
Soil Indicators ◽  
Selection Of

Abstract Panax notoginseng is a highly regarded medicinal plant that has been cultivated for more than 400 years in Southwest China. The obstacles associated with the continuous cropping of P. notoginseng are the greatest issues for the development this plant. In the present study, the micro-ecologies of soils differing in the duration of P. notoginseng planting were compared, the results of which could provide important information to aid in solving the problems associated with the continuous cropping of P. notoginseng. Soils in which P. notoginseng had grown for 1, 3 or 5 years, as well as unplanted or fallow soil, which had a P. notoginseng planting interval of 1, 3, 6 or 9 years, were collected in Yunnan Province, China. The numbers and physiological groups of microorganisms, soil enzyme activities and nutrients present in the soil were analyzed to identify the effects of continuous cropping and determine the influence of crop rotation on the soil. After P. notoginseng was planted, the ecological structure of the soil and the balance of soil nutrients changed. These changes in the soil ecosystem prevented the soil from adapting to the continuous cropping of P. notoginseng, which eventually limited the growth of P. notoginseng and increased the incidence of diseases. After rotation of P. notoginseng, some soil indicators were restored, and some indicators with irregular changes may have been caused by crop rotation and field fertilization management practices. Thus, the selection of suitable crop rotations will facilitate the use of continuous cropping for P. notoginseng.

scholarly journals Composition and function of rhizosphere microbiome of Panax notoginseng with discrepant yields

2020 ◽  
Author(s):  
Mengzhi Li ◽  
Zhongjian Chen ◽  
Jun Qian ◽  
Fugang Wei ◽  
Guozhuang Zhang ◽  
...  
Keyword(s):  
Cytochrome P450 ◽  
Functional Traits ◽  
Cropping System ◽  
Panax Notoginseng ◽  
Continuous Cropping ◽  
Metagenomic Sequencing ◽  
Rhizosphere Microbiome ◽  
Functional Features ◽  
Continuous Cropping System ◽  
And Function

Abstract Background: Panax notoginseng is a highly valuable medicinal plant. Reduced P. notoginseng yield is a common and serious problem that arises in a continuous cropping system. Variation in the composition and function of soil microbial community is considered the primary cause of yield reduction.Methods: This study used shotgun metagenomic sequencing approaches to describe the taxonomic and functional features of P. notoginseng rhizosphere microbiome and screen microbial taxa and functional traits related to yields. Results: At the family and genus level, a total of 43 families and 45 genera (relative abundance > 0.1%) were obtained, and the correlation with the yield of P. notoginseng was further analyzed. Nitrosomonadaceae, Xanthomonadaceae, Mycobacterium and Arthrobacter that were enriched in soils with higher yields were positively correlated with P. notoginseng yields, thereby suggesting that they might increase yields. Negative correlation coefficients indicated that Xanthobacteraceae, Caulobacteraceae, Oxalobacteraceae, Chitinophagaceae, Sphingomonas, Hyphomicrobium, Variovorax and Phenylobacterium might be detrimental to P. notoginseng growth. A total of 85 functional traits were significantly (P < 0.05) correlated with P. notoginseng yields. Functional traits, likely steroid biosynthesis and MAPK signaling pathway were positively correlated with P. notoginseng yields. In contrast, functional traits, such as bacterial secretion system, ABC transporters, metabolism of xenobiotics by cytochrome P450 and drug metabolism–cytochrome P450, were negatively associated with yields. Conclusions: This study describes an overview of the rhizosphere microbiome of P. notoginseng with discrepant yields and identifies the taxa and functional traits related to yields. Our results provide valuable information to guide the isolation and culture of potentially beneficial microorganisms and to utilize the power of the microbiome to increase plant yields in a continuous cropping system.

scholarly journals Composition and function of rhizosphere microbiome of Panax notoginseng with discrepant yields

2020 ◽  
Author(s):  
Mengzhi Li ◽  
Zhongjian Chen ◽  
Jun Qian ◽  
Fugang Wei ◽  
Guozhuang Zhang ◽  
...  
Keyword(s):  
Cytochrome P450 ◽  
Functional Traits ◽  
Cropping System ◽  
Panax Notoginseng ◽  
Continuous Cropping ◽  
Metagenomic Sequencing ◽  
Rhizosphere Microbiome ◽  
Functional Features ◽  
Continuous Cropping System ◽  
And Function

Abstract Background Panax notoginseng is a highly valuable medicinal plant. Reduced P. notoginseng yield is a common and serious problem that arises in a continuous cropping system. Variation in the composition and function of soil microbial community is considered the primary cause of yield reduction. Methods This study used shotgun metagenomic sequencing approaches to describe the taxonomic and functional features of P. notoginseng rhizosphere microbiome and screen microbial taxa and functional traits related to yields. Results A total of 43 families and 45 genera (relative abundance > 0.1%) were further confirmed to be related to P. notoginseng yields. Nitrosomonadaceae, Xanthomonadaceae, Mycobacterium and Arthrobacter that were enriched in soils with higher yields were positively correlated with P. notoginseng yields, thereby suggesting that they might increase yields. Negative correlation coefficients indicated that Xanthobacteraceae, Caulobacteraceae, Oxalobacteraceae, Chitinophagaceae, Sphingomonas, Hyphomicrobium, Variovorax and Phenylobacterium might be detrimental to P. notoginseng growth. A total of 85 functional traits were significantly (P < 0.05) correlated with P. notoginseng yields. Functional traits, likely steroid biosynthesis and MAPK signaling pathway were positively correlated with P. notoginseng yields. In contrast, functional traits, such as bacterial secretion system, ABC transporters, metabolism of xenobiotics by cytochrome P450 and drug metabolism–cytochrome P450, were negatively associated with yields. Conclusions This study describes an overview of the rhizosphere microbiome of P. notoginseng with discrepant yields and confirms the taxa and functional traits related to yields. Our results provide valuable information to guide the isolation and culture of potentially beneficial microorganisms and to utilize the power of the microbiome to increase plant yields in a continuous cropping system.

Stereoscopic cultivation of Panax notoginseng: A new approach to overcome the continuous cropping obstacle

2018 ◽  
Vol 126 ◽  
pp. 38-47 ◽  
Author(s):  
Peiran Liao ◽  
Pengfei Liu ◽  
Yaolong Wang ◽  
Chunmei Huang ◽  
Lei Lan ◽  
...  
Keyword(s):  
Panax Notoginseng ◽  
Continuous Cropping ◽  
New Approach

Evaluation method for imaging plate resolution by means of phase contrast transfer function

1995 ◽  
Vol 53 ◽  
pp. 662-663 ◽  
Author(s):  
T. Oikawa ◽  
H. Kosugi ◽  
F. Hosokawa ◽  
D. Shindo ◽  
M. Kersker
Keyword(s):  
Transfer Function ◽  
Phase Contrast ◽  
Evaluation Method ◽  
Amorphous Film ◽  
Imaging Plate ◽  
X Rays ◽  
Special Shape ◽  
Contrast Transfer Function ◽  
Contrast Image ◽  
Specimen Shape

Evaluation of the resolution of the Imaging Plate (IP) has been attempted by some methods. An evaluation method for IP resolution, which is not influenced by hard X-rays at higher accelerating voltages, was proposed previously by the present authors. This method, however, requires truoblesome experimental preperations partly because specially synthesized hematite was used as a specimen, and partly because a special shape of the specimen was used as a standard image. In this paper, a convenient evaluation method which is not infuenced by the specimen shape and image direction, is newly proposed. In this method, phase contrast images of thin amorphous film are used.Several diffraction rings are obtained by the Fourier transformation of a phase contrast image of thin amorphous film, taken at a large under focus. The rings show the spatial-frequency spectrum corresponding to the phase contrast transfer function (PCTF). The envelope function is obtained by connecting the peak intensities of the rings. The evelope function is offten used for evaluation of the instrument, because the function shows the performance of the electron microscope (EM).

Combining Values

2002 ◽  
Vol 7 (2) ◽  
pp. 1-4, 12 ◽  
Author(s):  
Christopher R. Brigham
Keyword(s):  
Lower Extremity ◽  
Upper Extremity ◽  
Evaluation Method ◽  
Proximal Phalanx ◽  
Common Error ◽  
The Third ◽  
Whole Person ◽  
Impairment Ratings ◽  
Upper Extremity Impairment ◽  
The Individual

Abstract To account for the effects of multiple impairments, evaluating physicians must provide a summary value that combines multiple impairments so the whole person impairment is equal to or less than the sum of all the individual impairment values. A common error is to add values that should be combined and typically results in an inflated rating. The Combined Values Chart in the AMA Guides to the Evaluation of Permanent Impairment, Fifth Edition, includes instructions that guide physicians about combining impairment ratings. For example, impairment values within a region generally are combined and converted to a whole person permanent impairment before combination with the results from other regions (exceptions include certain impairments of the spine and extremities). When they combine three or more values, physicians should select and combine the two lowest values; this value is combined with the third value to yield the total value. Upper extremity impairment ratings are combined based on the principle that a second and each succeeding impairment applies not to the whole unit (eg, whole finger) but only to the part that remains (eg, proximal phalanx). Physicians who combine lower extremity impairments usually use only one evaluation method, but, if more than one method is used, the physician should use the Combined Values Chart.

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