The Synthesis of the β-D-Glucoside of Medicagenic Acid, an Alfalfa Root Saponin1

1963 ◽  
Vol 28 (1) ◽  
pp. 240-242 ◽  
Author(s):  
R. J. Morris ◽  
D. L. Tankersley
Keyword(s):  
Medicagenic Acid ◽  
Alfalfa Root

Hederagenin and medicagenic acid effects on the contractility of bovine isolated abomasum specimens

Planta Medica ◽  
2016 ◽  
Vol 81 (S 01) ◽  
pp. S1-S381
Author(s):  
M Marta ◽  
C Magdalena ◽  
D Natalia ◽  
K Wojciech
Keyword(s):  
Medicagenic Acid

Exploration of Endophytes from Alfalfa (Medicago sativa L.) as Biocontrol Agents

2020 ◽  
pp. 1-8
Author(s):  
Beilei Wu ◽  
Beilei Wu ◽  
Mei Li ◽  
Xiaoli Chen ◽  
Xiliang Jiang ◽  
...  
Keyword(s):  
Medicago Sativa ◽  
Root Rot ◽  
Agricultural Production ◽  
Biocontrol Agents ◽  
Bacillus Spp ◽  
Medicago Sativa L ◽  
The Common ◽  
Seedling Germination ◽  
Germination Experiments ◽  
Alfalfa Root

Endophytes are increasingly investigated as biocontrol agents for agricultural production. The identification of new endophytes with high effectiveness against plant disease is very important. A total of 362 strains of endophytes, including fungi, bacteria, and actinomycete, were isolated from alfalfa (Medicago sativa L.) collected in Hebei, Inner Mongolia and Ningxia provinces of China. The three strains of endophytic bacteria (NA NX51R-5, NA NX90R-8, and NA NM1S-1) with strong biocontrol capability with >50% effectiveness were screened against the common alfalfa root rot pathogen Fusarium oxysporum F. sp. medicaginis in alfalfa seedling germination experiments on MS medium and pot experiments. Using phylogenetic analysis, the isolates of NA NM1S-1 and NA NX51R-5 were identified as Bacillus spp. by 16S rDNA, while NA NX90R-8 was found to be Pseudomonas sp.

Alfalfa Root Nitrogen Reserves and Regrowth Potential in Response to Fall Harvests

Crop Science ◽  
2003 ◽  
Vol 43 (1) ◽  
pp. 181 ◽  
Author(s):  
Catherine Dhont ◽  
Yves Castonguay ◽  
Paul Nadeau ◽  
Gilles Bélanger ◽  
François-P. Chalifour
Keyword(s):  
Root Nitrogen ◽  
Alfalfa Root

scholarly journals Alfalfa Root Nodule Carbon Dioxide Fixation

1984 ◽  
Vol 75 (1) ◽  
pp. 261-264 ◽  
Author(s):  
Carroll P. Vance ◽  
Susan Stade
Keyword(s):  
Carbon Dioxide ◽  
Root Nodule ◽  
Carbon Dioxide Fixation ◽  
Alfalfa Root

scholarly journals Alfalfa Root Nodule Carbon Dioxide Fixation

1983 ◽  
Vol 72 (2) ◽  
pp. 469-473 ◽  
Author(s):  
Carroll P. Vance ◽  
Susan Stade ◽  
Carl A. Maxwell
Keyword(s):  
Carbon Dioxide ◽  
Root Nodule ◽  
Carbon Dioxide Fixation ◽  
Alfalfa Root

scholarly journals Alfalfa Root Nodule Invasion Efficiency Is Dependent on Sinorhizobium melilotiPolysaccharides

2000 ◽  
Vol 182 (15) ◽  
pp. 4310-4318 ◽  
Author(s):  
Brett J. Pellock ◽  
Hai-Ping Cheng ◽  
Graham C. Walker
Keyword(s):  
Molecular Weight ◽  
Sinorhizobium Meliloti ◽  
Root Nodule ◽  
Fluorescent Protein ◽  
Infection Thread ◽  
Low Molecular Weight ◽  
Infection Threads ◽  
Green Fluorescent ◽  
K Antigen ◽  
Alfalfa Root

ABSTRACT The soil bacterium Sinorhizobium meliloti is capable of entering into a nitrogen-fixing symbiosis with Medicago sativa (alfalfa). Particular low-molecular-weight forms of certain polysaccharides produced by S. meliloti are crucial for establishing this symbiosis. Alfalfa nodule invasion by S. meliloti can be mediated by any one of three symbiotically important polysaccharides: succinoglycan, EPS II, or K antigen (also referred to as KPS). Using green fluorescent protein-labeled S. meliloti cells, we have shown that there are significant differences in the details and efficiencies of nodule invasion mediated by these polysaccharides. Succinoglycan is highly efficient in mediating both infection thread initiation and extension. However, EPS II is significantly less efficient than succinoglycan at mediating both invasion steps, and K antigen is significantly less efficient than succinoglycan at mediating infection thread extension. In the case of EPS II-mediated symbioses, the reduction in invasion efficiency results in stunted host plant growth relative to plants inoculated with succinoglycan or K-antigen-producing strains. Additionally, EPS II- and K-antigen-mediated infection threads are 8 to 10 times more likely to have aberrant morphologies than those mediated by succinoglycan. These data have important implications for understanding how S. meliloti polysaccharides are functioning in the plant-bacterium interaction, and models are discussed.

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