Wheat bulb fly,Delia coarctata, larval attraction to phenolic components of host-plant root exudates

2013 ◽  
Vol 150 (2) ◽  
pp. 166-173 ◽  
Author(s):  
C.D. Rogers ◽  
K.A. Evans
Keyword(s):  
Host Plant ◽  
Root Exudates ◽  
Plant Root ◽  
Phenolic Components

Wheat bulb fly (Delia coarctata, Fallén, Diptera: Anthomyiidae) larval response to hydroxamic acid constituents of host-plant root exudates

2013 ◽  
Vol 103 (3) ◽  
pp. 261-268 ◽  
Author(s):  
C.D. Rogers ◽  
K.A. Evans
Keyword(s):  
Host Plant ◽  
Root Exudates ◽  
Control Strategies ◽  
Chemical Constituents ◽  
Plant Root ◽  
Choice Test ◽  
Full Potential ◽  
Specific Chemical ◽  
Rayleigh Test ◽  
Newly Hatched Larvae

AbstractWheat bulb fly (WBF, Delia coarctata, Fallén, Diptera: Anthomyiidae) is a pest of commercial importance in wheat, barley and rye, with attacked crops failing to produce full potential yields. Females do not oviposit in association with a host-plant; therefore, prompt location of a suitable host is critical to the survival of the newly hatched larvae. The objective of this study was to conduct choice test bioassays to assess the attraction of WBF larvae to specific chemical constituents of WBF host-plant root exudates, the hydroxamic acids DIMBOA (2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one) and MBOA (6-methoxy-benzoxazolin-2-one). The larval response to four concentrations of each test compound was assessed in arena bioassays. Analysis using a Rayleigh test of uniformity of the final resting positions of larvae in response to these chemicals indicated attraction. These results go some way to explaining the mechanisms by which WBF larvae locate host plants, giving the potential to develop semiochemical based control strategies.

Methods of collection of plant root exudates in relation to plant metabolism and purpose: A review

2013 ◽  
Vol 176 (2) ◽  
pp. 175-199 ◽  
Author(s):  
Valerie Vranova ◽  
Klement Rejsek ◽  
Keith R. Skene ◽  
Dalibor Janous ◽  
Pavel Formanek
Keyword(s):  
Root Exudates ◽  
Plant Root ◽  
Plant Metabolism

The Effect of Tryptophan Present in Plant Root Exudates on the Phytostimulating Activity of Rhizobacteria

Microbiology ◽  
2004 ◽  
Vol 73 (2) ◽  
pp. 156-158 ◽  
Author(s):  
L. V. Kravchenko ◽  
T. S. Azarova ◽  
N. M. Makarova ◽  
I. A. Tikhonovich
Keyword(s):  
Root Exudates ◽  
Plant Root

Plant Root Exudates as Determinant of Rhizomicrobiome

2020 ◽  
pp. 105-126
Author(s):  
V. Balasubramanian ◽  
Arunima Sur ◽  
Kush Kumar Nayak ◽  
Ravi Kant Singh
Keyword(s):  
Root Exudates ◽  
Plant Root

In vitro studies on the behaviour of second-stage juveniles of Heterodera schachtii (Nematoda: Heteroderidae) in response to host plant root exudates

Parasitology ◽  
1991 ◽  
Vol 103 (1) ◽  
pp. 149-155 ◽  
Author(s):  
F. Grundler ◽  
L. Schnibbe ◽  
U. Wyss
Keyword(s):  
Root Exudates ◽  
Root Exudate ◽  
Plant Root ◽  
Time Lapse ◽  
Heterodera Schachtii ◽  
Second Stage ◽  
Video Recordings ◽  
Aseptic Conditions ◽  
Agarose Layer

The behaviour of Heterodera schachtii second-stage juveniles in response to mustard (Sinapis alba) rooxudates was observed and analysed under aseptic conditions in a standardized bioassay. Aggregation of juveniles on an agarose layer occurred within less than 30 min in the area where root exudates had been applied and persisted for several hours. Analysis of time-lapse video recordings showed that the aggregation did not result from a directed orientation of the juvenile towards the root exudate. This was supported by an orientation assay using single juveniles. Aggregated juveniles showed pre-infection exploratory behaviour, including stylet thrusting and head-end bending, while staying at rest for several minutes.

The arbuscular mycorrhizal host status of plants can not be linked with the Striga seed-germination-activity of plant root exudates

2009 ◽  
Vol 116 (2) ◽  
pp. 86-89 ◽  
Author(s):  
V. Lendzemo ◽  
T. W. Kuyper ◽  
A. Urban ◽  
G. Vegvari ◽  
M. Puschenreiter ◽  
...  
Keyword(s):  
Seed Germination ◽  
Root Exudates ◽  
Plant Root ◽  
Arbuscular Mycorrhizal ◽  
Host Status

Effects of antibiotics on microbial community structure and microbial functions in constructed wetlands treated with artificial root exudates

2020 ◽  
Vol 22 (1) ◽  
pp. 217-226 ◽  
Author(s):  
Xin-nan Tong ◽  
Xin-ze Wang ◽  
Xiao-juan He ◽  
Zhe Wang ◽  
Wen-xuan Li
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Constructed Wetlands ◽  
Root Exudates ◽  
Microbial Community Structure ◽  
Plant Root

In the rhizosphere, plant root exudates can mediate the toxicity of antibiotics on microorganisms, yet the mechanisms are poorly understood.

scholarly journals The Biocontrol Agent and Insect Pathogen Photorhabdus luminescens Interacts with Plant Roots

2020 ◽  
Vol 86 (17) ◽  
Author(s):  
Alice Regaiolo ◽  
Nazzareno Dominelli ◽  
Karsten Andresen ◽  
Ralf Heermann
Keyword(s):  
Biological Control ◽  
Pest Management ◽  
Root Exudates ◽  
Biological Control Agent ◽  
Plant Root ◽  
Specific Interaction ◽  
Plant Roots ◽  
Photorhabdus Luminescens ◽  
Content Type ◽  
Root Interactions

ABSTRACT The number of sustainable agriculture techniques to improve pest management and environmental safety is rising, as biological control agents are used to enhance disease resistance and abiotic stress tolerance in crops. Here, we investigated the capacity of the Photorhabdus luminescens secondary variant to react to plant root exudates and their behavior toward microorganisms in the rhizosphere. P. luminescens is known to live in symbiosis with entomopathogenic nematodes (EPNs) and to be highly pathogenic toward insects. The P. luminescens-EPN relationship has been widely studied, and this combination has been used as a biological control agent; however, not much attention has been paid to the putative lifestyle of P. luminescens in the rhizosphere. We performed transcriptome analysis to show how P. luminescens responds to plant root exudates. The analysis highlighted genes involved in chitin degradation, biofilm regulation, formation of flagella, and type VI secretion system. Furthermore, we provide evidence that P. luminescens can inhibit growth of phytopathogenic fungi. Finally, we demonstrated a specific interaction of P. luminescens with plant roots. Understanding the role and the function of this bacterium in the rhizosphere might accelerate the progress in biocontrol manipulation and elucidate the peculiar mechanisms adopted by plant growth-promoting rhizobacteria in plant root interactions. IMPORTANCE Insect-pathogenic Photorhabdus luminescens bacteria are widely used in biocontrol strategies against pests. Very little is known about the life of these bacteria in the rhizosphere. Here, we show that P. luminescens can specifically react to and interact with plant roots. Understanding the adaptation of P. luminescens in the rhizosphere is highly important for the biotechnological application of entomopathogenic bacteria and could improve future sustainable pest management in agriculture.

Yellow Nutsedge Response to Southern Root-Knot Nematodes, Chile Peppers, and Metolachlor

Weed Science ◽  
1994 ◽  
Vol 42 (4) ◽  
pp. 534-540 ◽  
Author(s):  
Jill Schroeder ◽  
Michael J. Kenney ◽  
Stephen H. Thomas ◽  
Leigh Murray
Keyword(s):  
Host Plant ◽  
Plant Root ◽  
Root Systems ◽  
Root Mass ◽  
Root Knot Nematode ◽  
Root Knot Nematodes ◽  
Yellow Nutsedge ◽  
Greenhouse Experiments ◽  
Shoot Number ◽  
Chile Peppers

Greenhouse experiments showed that yellow nutsedge shoot number and shoot and root dry weights were reduced by root-knot nematodes and chile peppers. Root-knot nematodes increased and chile peppers decreased the number of yellow nutsedge tubers. Yellow nutsedge tuber germination was reduced by chile peppers but not by root-knot nematodes. Yellow nutsedge established from root-knot nematode-infected tubers produced more tubers than noninfected tubers. Root-knot nematode populations became established on yellow nutsedge root systems when plants were established from tubers previously cultured with root-knot nematodes. Metolachlor stunted chile peppers, eliminated yellow nutsedge, and influenced root-knot nematode populations through reduction of host plant root mass. However, when root-knot nematodes were present, yellow nutsedge tuber germination was not affected by metolachlor. This research indicates that the pests do not exist independently and that their management may be interrelated.

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