scholarly journals Occurrence and Survival of the Dispersal Forms of Pine Wood Nematode, Bursaphelenchus lignicolus MAMIYA and KIYOHARA : Ecological significance of dormancy in plant parasitic nematodes. V.

1977 ◽  
Vol 12 (4) ◽  
pp. 293-302 ◽  
Author(s):  
Nobuyoshi ISHIBASHI ◽  
Eizo KONDO
Keyword(s):  
Parasitic Nematodes ◽  
Pine Wood Nematode ◽  
Ecological Significance ◽  
Plant Parasitic Nematodes ◽  
Pine Wood ◽  
Plant Parasitic

scholarly journals Nematicidal Activity of Cry1Ea11 from Bacillus thuringiensis BRC-XQ12 Against the Pine Wood Nematode (Bursaphelenchus xylophilus)

2018 ◽  
Vol 108 (1) ◽  
pp. 44-51 ◽  
Author(s):  
Tianpei Huang ◽  
Qunxin Lin ◽  
Xiaoli Qian ◽  
Ying Zheng ◽  
Junmin Yao ◽  
...  
Keyword(s):  
Bacillus Thuringiensis ◽  
Bursaphelenchus Xylophilus ◽  
Laser Scanning Microscopy ◽  
Nematicidal Activity ◽  
Confocal Laser ◽  
Parasitic Nematodes ◽  
Pine Wood Nematode ◽  
Plant Parasitic Nematodes ◽  
Pine Wood ◽  
Plant Parasitic

The nematicidal activity of 92 Bacillus thuringiensis strains against the pine wood nematode Bursaphelenchus xylophilus, one of the world’s top 10 plant-parasitic nematodes, was determined. The insecticidal crystal proteins (ICPs) from Bacillus thuringiensis BRC-XQ12 were the most toxic to Bursaphelenchus xylophilus, with a lethal concentration 50 (LC50) of 32.13 μg/ml. Because the ICPs expressed by Bacillus thuringiensis BRC-XQ12 were closest to Cry1Ea6 and B. thuringiensis BRC-XQ12 contained four kinds of cry1 subgenes (cry1Aa, cry1Cb, cry1Ea, and cry1Ia), Cry1Ea was most likely to be the key active component against the nematode. The 3,516-bp cry1Ea11 gene from BRC-XQ12, as designated by the B. thuringiensis δ-endotoxin nomenclature committee, was expressed in Escherichia coli. Purified Cry1Ea11 showed an LC50 of 32.53 and 23.23 μg/ml at 24 and 48 h, with corresponding virulence equations of Y = 32.15X + 1.38 (R2 = 0.9951) and Y = 34.29X + 3.16 (R2 = 0.9792), respectively. In order to detect the pathway of B. thuringiensis Cry1Ea11 into Bursaphelenchus xylophilus, the nematode was fed with NHS-rhodamine-labeled GST-Cry1Ea11. The results of confocal laser-scanning microscopy showed that the 159-kDa GST-Cry1Ea11 could be detected in the stylet and the esophageal lumen of the pine wood nematode, indicating that GST-Cry1Ea11 could enter into the nematode through the stylet. As far as we know, no Cry1 proteins have been shown to have activity against plant-parasitic nematodes before. These results demonstrate that Cry1Ea11 is a promising nematicidal protein for controlling pine wilt disease rendered by B. xylophilus, further dramatically broadening the spectrum of Bacillus thuringiensis ICPs.

Management of Plant-Parasitic Nematodes in Florida Cotton Production

EDIS ◽  
2017 ◽  
Vol 2017 (2) ◽  
pp. 8
Author(s):  
Zane Grabau
Keyword(s):  
Parasitic Nematodes ◽  
Cotton Production ◽  
Plant Parasitic Nematodes ◽  
Fact Sheet ◽  
Plant Parasitic

This 8-page fact sheet written by Zane J. Grabau and published in January 2017 by the UF Department of Entomology and Nematology explains how to diagnose and manage nematode problems in cotton production.­http://edis.ifas.ufl.edu/ng015

Sign in / Sign up

Export Citation Format

Share Document