Abstract
This study examined temperature acclimation, growth, and photosynthetic characteristics of the zygote-derived seedlings of Hizikia fusiformis (Harvey) Okamura (Sargassaceae). The seedlings were cultured at 15°C or 25°C for 4 weeks. The average relative growth rate was significantly higher in seedlings acclimated at 25°C. The photosynthetic rate measured at 15°C was much higher in seedlings grown at 15°C than those grown at 25°C, indicating photosynthetic acclimation to a lower temperature. At 35°C, the photosynthetic rate of 15°C-grown seedlings was drastically decreased, whereas that of 25°C-grown seedlings was significantly increased. The maximum relative electron transport rate (rETRmax) measured at the respective growth temperature was significantly higher in seedlings grown at 25°C than at 15°C. At a measuring temperature of 35°C, the rETRmax in both 15°C- and 25°C-grown seedlings were considerably reduced with regard to those measured at 15°C or 25°C. Our results suggested that, compared with the seedlings grown at 25°C, those acclimated at a lower temperature could be disadvantaged under adverse conditions such as increased temperatures.
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Acknowledgments
The authors wish to thank Dr S.J. Pang for kindly supplying the Hizikia fusiformis seedlings. This study was supported by the National Natural Science Foundation of China (41076094 and 30970450), Program for New Century Excellent Talents in University (NCET-10-0375), and the Fundamental Research Funds for the Central Universities, SCUT (2011ZG0013).
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Zou, D., Liu, S., Du, H. et al. Growth and photosynthesis in seedlings of Hizikia fusiformis (Harvey) Okamura (Sargassaceae, Phaeophyta) cultured at two different temperatures. J Appl Phycol 24, 1321–1327 (2012). https://doi.org/10.1007/s10811-011-9783-z
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DOI: https://doi.org/10.1007/s10811-011-9783-z