Affiliation:
1. Institute of Food and Agricultural Sciences, Agricultural Research and Education Center, University of Florida, Lake Alfred, Florida 33850
Abstract
An aseptic vacuum extraction technique was used to obtain xylem fluid from the roots of rough lemon (
Citrus jambhiri
Lush.) rootstock of Florida citrus trees. Bacteria were consistently isolated from vascular fluid of both healthy and young tree decline-affected trees. Thirteen genera of bacteria were found, the most frequently occurring genera being
Pseudomonas
(40%),
Enterobacter
(18%),
Bacillus, Corynebacterium
, and other gram-positive bacteria (16%), and
Serratia
(6%). Xylem bacterial counts fluctuated seasonally. Bacterial populations ranged from 0.1 to 22 per mm
3
of root tissue (about 10
2
to 2 × 10
4
bacteria per g of xylem) when bacterial counts were made on vascular fluid, but these numbers were 10- to 1,000-fold greater when aseptically homogenized xylem tissue was examined similarly. Some of the resident bacteria (4%) are potentially phytopathogenic. It is proposed that xylem bacteria have an important role in the physiology of citrus.
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology
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