and effect of temperature, nutrients and light intensity on the growth of two
freshwater algal species of Raphidophyceae new to Korea
Chae, B.Y. Jo and H.S. Kim*
School of Life
Sciences, Kyungpook National University, Daegu, 41566, Korea
Author E-mail: email@example.com
Paper received : 23.03.2017
Revised received : 01.06.2017
Re-revised received :
Accepted : 15.09.2017
Aim: The present study
was conducted to understand the taxonomy and effect of environmental factors
on the growth of two freshwater algal Raphidophyceae (Gonyostomum
depressum and G. semen) that are new to Korea.
used in the culture experiments were isolated from two small ponds in Jeju
Island and Kyungpook province of Korea. Species identification was based on
morphology and nuclear internal transcribed spacer (ITS) sequences of rDNA.
The growth characteristics of these species through the effect of
temperature, nitrate concentration and light intensity were investigated.
two species have different cell shape, size and caudus morphology. The
nuclear ITS rDNA sequences of specimens had 99% identity with G. depressum
and G. semen recorded at GenBank. Gonyostomum depressum had
the highest growth rate at 21˚C, nitrate concentration of
1,000 μM, and light intensity of 120 μmol photons m-2s-1.
G. semen showed the highest growth rate at 21ºC, 120
and nitrate concentration of 100 μM, respectively.
temperature seems to be important in controlling the distribution and growth
of G. depressum and G. semen.
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