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Growth, trichome size and akinete production of C ylindrospermopsis raciborskii (cyanobacteria) under different temperatures: Comparison of two strains isolated from the same pond
Author(s) -
Yamamoto Yoshimasa,
Shiah FuhKwo
Publication year - 2014
Publication title -
phycological research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.438
H-Index - 44
eISSN - 1440-1835
pISSN - 1322-0829
DOI - 10.1111/pre.12040
Subject(s) - biology , trichome , cylindrospermopsis raciborskii , strain (injury) , cyanobacteria , ecotype , botany , population , bacteria , genetics , demography , anatomy , sociology
Summary Coiled morphotype C ylindrospermopsis raciborskii ( W oloszynska) S eenayya et S ubba R aju that forms a water bloom in a shallow pond in northern T aiwan exhibits a negative correlation between trichome size and temperature. To investigate how temperature influences the growth and trichome size of C . raciborskii , two C . raciborskii strains isolated from the pond in A ugust and F ebruary were grown at three temperatures (18, 24 and 30°C). Both strains exhibited the lowest and highest specific growth rates at 18°C and 24°C, respectively, and the trichomes became the largest at 18°C. However, specific growth rates of the strain isolated in A ugust exceeded those of the strain isolated in F ebruary, and the trichomes of the strain isolated in F ebruary were larger than those of the strain isolated in A ugust regardless of temperature. Moreover, although both strains produced larger numbers of akinetes at higher temperatures, the strain isolated in A ugust produced many more akinetes than did the other. These findings suggest that the two strains are not identical, leading to the conclusion that the C . raciborskii population in the pond consists of at least two ecotypes. Large trichome formation and akinete production are thought to be different types of countermeasure against cold of C . raciborskii , and the patterns of investment in developing these functions seemed to vary between the strains.