Wheat cover crop promoted cucumber seedling growth through regulating soil nutrient resources or soil microbial communities?

2017 ◽  
Vol 418 (1-2) ◽  
pp. 459-475 ◽  
Author(s):  
Danmei Gao ◽  
Xingang Zhou ◽  
Yadong Duan ◽  
Xuepeng Fu ◽  
Fengzhi Wu
Keyword(s):  
Microbial Communities ◽  
Seedling Growth ◽  
Cover Crop ◽  
Soil Microbial Communities ◽  
Soil Nutrient ◽  
Cucumber Seedling ◽  
Soil Microbial ◽  
Nutrient Resources

scholarly journals Syringic acid inhibited cucumber seedling growth and changed rhizosphere microbial communities

2014 ◽  
Vol 60 (No. 4) ◽  
pp. 158-164 ◽  
Author(s):  
Zhou XG ◽  
Wu FZ ◽  
Xiang WS
Keyword(s):  
Microbial Communities ◽  
Seedling Growth ◽  
Fungal Community ◽  
Root Exudation ◽  
Soil Microbial Communities ◽  
Syringic Acid ◽  
Plant Residue ◽  
Rrna Gene ◽  
Cucumber Seedling ◽  
Community Structures

Phenolic compounds enter soil as a result of root exudation and plant residue decomposition, but their impacts on soil microbial communities are poorly understood. In this experiment, effects of syringic acid on cucumber rhizosphere microbial communities were evaluated. Rhizosphere bacterial and fungal community structures and abundances were analyzed with PCR-denaturing gradient gel electrophoresis (DGGE) and quantitative PCR, respectively. Results showed that syringic acid inhibited cucumber seedling growth at concentrations of 0.05 to 0.2 μmol/g soil, and increased rhizosphere soil dehydrogenase activity, microbial biomass carbon content, bacterial 16S rRNA gene and fungal ITS rRNA gene densities, and decreased the bacteria-to-fungi ratio at concentrations of 0.02 to 0.2 μmol/g soil. Syringic acid also changed rhizosphere bacterial and fungal community structures: it decreased the richness, evenness, and diversity indices of rhizosphere bacterial community but had no significant influences on that of fungal community, indicating that syringic acid had different influence on bacterial and fungal communities. Taken together, these results showed that syringic acid inhibited cucumber growth and altered rhizosphere microbial communities, suggesting that syringic acid plays some role in the communication between plants and soil microorganisms.

Soil microbial communities from an elevational cline differ in their effect on conifer seedling growth

2010 ◽  
Vol 340 (1-2) ◽  
pp. 491-504 ◽  
Author(s):  
Cameron Wagg ◽  
Brian C. Husband ◽  
D. Scott Green ◽  
Hugues B. Massicotte ◽  
R. Larry Peterson
Keyword(s):  
Microbial Communities ◽  
Seedling Growth ◽  
Soil Microbial Communities ◽  
Soil Microbial ◽  
Conifer Seedling

scholarly journals Does a carbonatite deposit influence its surrounding ecosystem?

FACETS ◽  
2019 ◽  
Vol 4 (1) ◽  
pp. 389-406
Author(s):  
James M.C. Jones ◽  
Elizabeth A. Webb ◽  
Michael D.J. Lynch ◽  
Trevor C. Charles ◽  
Pedro M. Antunes ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Soil Chemistry ◽  
Soil Microbial Communities ◽  
Soil Nutrient ◽  
Vegetation Survey ◽  
Northern Ontario ◽  
Soil Microbial ◽  
Bacteria And Fungi ◽  
First Time

Carbonatites are unusual alkaline rocks with diverse compositions. Although previous work has characterized the effects these rocks have on soils and plants, little is known about their impacts on local ecosystems. Using a deposit within the Great Lakes–St. Lawrence forest in northern Ontario, Canada, we investigated the effect of a carbonatite on soil chemistry and on the structure of plant and soil microbial communities. This was done using a vegetation survey conducted above and around the deposit, with corresponding soil samples collected for determining soil nutrient composition and for assessing microbial community structure using 16S/ITS Illumina Mi-Seq sequencing. In some soils above the deposit a soil chemical signature of the carbonatite was found, with the most important effect being an increase in soil pH compared with the non-deposit soils. Both plants and microorganisms responded to the altered soil chemistry: the plant communities present in carbonatite-impacted soils were dominated by ruderal species, and although differences in microbial communities across the surveyed areas were not obvious, the abundances of specific bacteria and fungi were reduced in response to the carbonatite. Overall, the deposit seems to have created microenvironments of relatively basic soil in an otherwise acidic forest soil. This study demonstrates for the first time how carbonatites can alter ecosystems in situ.

scholarly journals Cover crop-driven shifts in soil microbial communities could modulate tomato early crop growth via plant-soil feedbacks

2021 ◽  
Author(s):  
Micaela Tosi ◽  
John Drummelsmith ◽  
Dasiel Obregón ◽  
Inderjot Chahal ◽  
Laura L. Van Eerd ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Cover Crops ◽  
Cover Crop ◽  
Crop Residues ◽  
Management Strategies ◽  
Soil Microbial Communities ◽  
Crop Productivity ◽  
Residue Management ◽  
Soil Microbial ◽  
Plant Soil

Abstract Sustainable agricultural practices such as crop diversification, cover crops and residue retention are increasingly applied to counteract detrimental effects of agriculture on natural resources. Since part of their effects occur via changes soil microbial communities, it is critical to understand how these respond to different practices. Our study analyzed five cover crop (cc) treatments (oat, rye, radish, rye-radish mixture and no-cc control) and two crop residue management strategies (retention/R+ or removal/R-) in an 8-year diverse horticultural crop rotation trial from ON, Canada. Cc effects were small but stronger than those of residue management. Radish-based cover crops tended to be the most beneficial for both microbial abundance and richness, yet detrimental for fungal evenness. Cc species, in particular radish, also shaped fungal and, to a lesser extent, prokaryotic community composition. Crop residues modulated cc effects on bacterial abundance and fungal evenness (i.e., more sensitive in R- than R+), as well as microbial taxa. Several microbial structure features, some affected by cc, were correlated with early tomato growth in the following spring (e.g., composition, taxa within Actinobacteria, Firmicutes and Ascomycota). Our study suggests that, whereas mid-term cc effects were small, they need to be better understood as they could be influencing crop productivity via plant-soil feedbacks.

scholarly journals Rotation and Cover Crop Effects on Soilborne Potato Diseases, Tuber Yield, and Soil Microbial Communities

Plant Disease ◽  
2010 ◽  
Vol 94 (12) ◽  
pp. 1491-1502 ◽  
Author(s):  
Robert P. Larkin ◽  
Timothy S. Griffin ◽  
C. Wayne Honeycutt
Keyword(s):  
Microbial Communities ◽  
Verticillium Wilt ◽  
Cover Crop ◽  
Common Scab ◽  
Tuber Yield ◽  
Soil Microbial Communities ◽  
Black Scurf ◽  
Winter Rye ◽  
Bacterial Populations ◽  
Soil Microbial

Seven different 2-year rotations, consisting of barley/clover, canola, green bean, millet/rapeseed, soybean, sweet corn, and potato, all followed by potato, were assessed over 10 years (1997–2006) in a long-term cropping system trial for their effects on the development of soilborne potato diseases, tuber yield, and soil microbial communities. These same rotations were also assessed with and without the addition of a fall cover crop of no-tilled winter rye (except for barley/clover, for which underseeded ryegrass was substituted for clover) over a 4-year period. Canola and rapeseed rotations consistently reduced the severity of Rhizoctonia canker, black scurf, and common scab (18 to 38% reduction), and canola rotations resulted in higher tuber yields than continuous potato or barley/clover (6.8 to 8.2% higher). Addition of the winter rye cover crop further reduced black scurf and common scab (average 12.5 and 7.2% reduction, respectively) across all rotations. The combined effect of a canola or rapeseed rotation and winter rye cover crop reduced disease severity by 35 to 41% for black scurf and 20 to 33% for common scab relative to continuous potato with no cover crop. Verticillium wilt became a prominent disease problem only after four full rotation cycles, with high disease levels in all plots; however, incidence was lowest in barley rotations. Barley/clover and rapeseed rotations resulted in the highest soil bacterial populations and microbial activity, and all rotations had distinct effects on soil microbial community characteristics. Addition of a cover crop also resulted in increases in bacterial populations and microbial activity and had significant effects on soil microbial characteristics, in addition to slightly improving tuber yield (4% increase). Thus, in addition to positive effects in reducing erosion and improving soil quality, effective crop rotations in conjunction with planting cover crops can provide improved control of soilborne diseases. However, this study also demonstrated limitations with 2-year rotations in general, because all rotations resulted in increasing levels of common scab and Verticillium wilt over time.

Soil microbial communities under cacao agroforestry and cover crop systems in Peru

2017 ◽  
Vol 120 ◽  
pp. 273-280 ◽  
Author(s):  
Jeffrey S. Buyer ◽  
Virupax C. Baligar ◽  
Zhenli He ◽  
Enrique Arévalo-Gardini
Keyword(s):  
Microbial Communities ◽  
Cover Crop ◽  
Soil Microbial Communities ◽  
Soil Microbial

scholarly journals SOIL MICROBIAL COMMUNITIES AS AFFECTED BY A COMMERCIAL ORGANIC FERTILIZER AND SUNN HEMP AS A COVER CROP IN ORGANIC SWEET PEPPER PRODUCTION IN PUERTO RICO

1969 ◽  
Vol 99 (1) ◽  
pp. 53-57
Author(s):  
Ana Negrete ◽  
Elide Valencia-Chin ◽  
Verónica Acosta-Martínez
Keyword(s):  
Puerto Rico ◽  
Microbial Communities ◽  
Cover Crop ◽  
Organic Fertilizer ◽  
Soil Microbial Communities ◽  
Sweet Pepper ◽  
Soil Microbial ◽  
Sunn Hemp

SOIL MICROBIAL COMMUNITIES AS AFFECTED BY A COMMERCIAL ORGANIC FERTILIZER AND SUNN HEMP AS A COVER CROP IN ORGANIC SWEET PEPPER PRODUCTION IN PUERTO RICO

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