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Allelopathic Effect Of Cyanobacteria On Endangered Submerged Macrophyte, Ottelia Acuminata, A Native Species Of Southwestern China | 10316
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Ottelia acuminata, a native, ornamental and edible submerged macrophyte in southwestern China, had been dominant
in the Dianchi Lake (the biggest lake in Yunnan Province and the sixth largest in China) before 1970s. However, it had
been destroyed seriously and become the endangered species after that, with the introduction of grazing fish, over-harvest and
cyanobacteria blooming (dominant by
Microcystis aeruginosa
). We hypothesize that
M. aeruginosa allelochemicals
may affect the
disappearance and recovery of
O. acuminata
. We employed two variations of
O. acuminate
(
O. acuminata
var.
crispa
, OAC and
O. acuminate
var.
songmingensis
, OAS) to test the effect of exudates and extracts of
M. aeruginosa
on seed germination and early
seedling growth of
O. acuminate
. We found that: (1) the
M. aeruginosa
exudates promoted seed germination of
O. acuminate
,
whilst the extracts inhibited it; (2) both exudates and extracts significantly decreased the seedlings healthy of OAC and OAS; (3)
exudates and extracts of
M. aeruginosa
inhibited the growth of
O. acuminate
seedlings, especially the root rates and the second
true leaf growing rates; (4) allelopathic effects of
M. aeruginosa
exudates were stronger than those of extracts. Our results indicate
that cyanobacteria can allelopathically inhibit this endangered plant. The early growth of seedlings rather than seed germination
seems to be a sensitive phase for the impact of cyanobacterial allelochemicals, and the OAC showed stronger resistance than OA
Biography
Xuexiu Chang had completed her Ph.D. in July 2000. After that, she has worked in Yunnan University as a lecturer, an associate professor and a
professor, in sequence. She had studied in Leibniz-Institute of Freshwater Ecology and Inland Fisheries (Berlin, Germany) as a visiting scholar. Now
she is the director of Environmental Science Department, School of Life Science, Yunnan University. She has published more than 20 papers (in
english or in chinese) and 4 higher education textbooks (in chinese) in reputed journals and presses. Also, she is serving as a reviewer member of
repute journals
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