| Abstract | ABSTRACT:
The genetic diversity of nine populations of
Lemna, seven for Lemna gibba and two for L.
minor was evaluated. The populations were
collected from different water courses in the
Nile Delta, Egypt; agricultural drainage, mixed
(agricultural and industrial) drainage and
irrigation canals. The genetic relationship
among the examined populations was
estimated based on recorded differences in
SDS-PAGE profiles, five isozyme systems and
ISSR fingerprinting. Construction of distance
trees illustrating the genetic distance among
the studied populations was performed using
the UPGMA method. The results revealed a
high level of inter and intra-species level of
genetic diversity. The two species were
delimited as two clusters at a distance of 1.52
in a UPGMA tree and Limna gibba populations
were separated into two subclusters at a
distance of 1.20 reflecting the samples
collected from Kafr El-Sheikh were separated
from those collected from Gharbia.
Geographical distributions of the samples
appear to have obvious influence on the
genetic diversity of the studied populations. |