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Salt response of the freshwater microalga
Scenedesmus obliquus (Turp.) Kutz is modulated by the algal growth phase- Journal of Oceanology and Limnology Vol. 38, Issue 3, Pages: 802-815(2020)
- Affiliations：
Department of Botany and Microbiology, Faculty of Science, Damietta University, New Damietta City 34517, Egypt
- Author bio：
Taha Mohamed EL-KATONY, tmsoliman2000@yahoo.co.uk
- Funds：
DOI：10.1007/s00343-019-9067-z
CLC：Received：14 March 2019，
Accepted：02 July 2019，
Online First：05 September 2019，
Published：2020-03
- Accepted：
Scan QR Code
MohamedEL-KATONY Taha, FaizEL-ADL Magda. Salt response of the freshwater microalga
Scenedesmus obliquus (Turp.) Kutz is modulated by the algal growth phase[J]. Journal of Oceanology and Limnology, 2020, 38(3): 802-815.MohamedEL-KATONY Taha, FaizEL-ADL Magda. Salt response of the freshwater microalga
Scenedesmus obliquus (Turp.) Kutz is modulated by the algal growth phase[J]. Journal of Oceanology and Limnology, 2020, 38(3): 802-815. DOI： 10.1007/s00343-019-9067-z.
摘要
Abstract
Growth and biochemical responses of the coenobial green alga
Scenedesmus obliquus
to salinity stress were monitored across different phases of growth. The alga was cultured on BG11 growth medium and subjected to 0
30
100
and 200 mmol/L NaCl for a period of 20 d
during which algal cultures were harvested at 4-d intervals. The salinity-induced inhibition of algal growth was accompanied with prolongation of timing of the different growth phases. The sharp and progressive salinity-induced inhibition of algal growth rate during the early phase of growth points to salt shock but moderation of inhibition at the subsequent stages of growth means algal acclimation to salinity. The concentrations of chlorophylls
a
and
b
soluble sugars
proteins as well as those of K
+
and Na
+
in the alga exhibited peaks at the initiation of the exponential phase of growth
with increasing magnitude in proportion to the increase in the level of salinity. Nevertheless
whereas soluble sugars of the alga peaked at initiation of the exponential phase
starch concentration progressively increased with culture age
reaching saturation towards the stationary phase. Whereas the salinity-induced increase in soluble sugars was most evident at the early stages of growth the reverse was true for starch. The present results point to fast acclimation of
S
.
obliquus
to salt stress post a brief salt shock
utilizing soluble sugars
K
+
and Na
+
for osmotic adjustment. Increasing salinity from 0 to 200 mmol/L NaCl led to progressive increase in soluble sugars
proteins
K
+
and Na
+
concentrations of the algal cells
particularly at the early stages of growth. However
the salinity-induced increase in chlorophyll concentration approached a limit at 100 mmol/L NaCl whereas that in starch concentration was more evident at the later stages of growth.
关键词
Keywords
references
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