9.5.13 lecture 4 pp.docx

2 Pages
124 Views
Unlock Document

Department
Plant Biology
Course
PBIO 117
Professor
Terrence P.Delaney
Semester
Fall

Description
9/5/13 Gram negative, Bacterial Pathogens Mollicutes & and Controls for Bacterial Disease  Xylella o Rod shaped, non-motile (aflagellate) o Walled, xylem limited o Nutritionally fastidious (picky), host dependent  Need specialized medium to culture (adapted to specialized environment)  100+ hosts (grapes, citrus, coffee)  Considered emerging pathogen due to upsurge & damage to valuable crops  Pierce’s disease of grape  Identified 1880’s in southern California  doesn’t affect north, not enough insect vectors that can live in the environment  sever outbreaks began when insect vectors appeared in grape producing areas  major threat to west & south  causes scorching & fruit loss  insect vectors o typically pierce into xylem to feed on sap o bacteria take up residence on insect vectors o glassy winged sharp shooter  invasive  breeds in more habitats/ moves frequently & further  feeds on wood in winter o disease spread favored by riparian habitats (b/c of sharpshooters) o difficult to prove as a pathogen w/ Koch’s Postulates o control measures  resistant varieties  keep away from riparian habitats  control sharpshooters  remove diseased vines  Mollicute o Wall-less prokaryotes  Negative b/c no wall to hold stain, soft-skinned bacteria o Two pathogen groups  Spiroplasms, phytoplasms o Insect vectored disease o Very small size & genome o Spiroplasms (genus)  Cultureable, helical  Phloem limited  Leaf hopper/ graft transmitted
More Less

Related notes for PBIO 117

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit