Effect of Temperature on Growth and Chlorophyll Fluorescence of Ulva fasciata

doi:10.13560/j.cnki.biotech.bull.1985.2016.07.015

Abstract

Abstract: In order to study the temperature adaptation mechanism of Ulva fasciata Delile,culturing the U. fasciata under the temperatures：5℃,10℃,15℃,20℃,25℃,30℃,33℃ and 35℃ for 7 d,and the growth change,chlorophyll content,and indexes of chlorophyll fluorescence of U. fasciata at different temperatures as well as the parameters of chlorophyll fluorescence after re-culturing at 25℃ were examined to understand the effects of different temperatures on the U. fasciata. Results showed that growth rate,chlorophyll content,the indexes of fluorescence（optimal photo-chemical quantum yield（F_v/F_m）,effective optimal photo-chemical quantum yield（F_v'/F_m'）,photosynthetic light use efficiency（α）,and photo-chemical quenching（qP））all reached the maximum at 25℃. All these physiological indexes of the seaweeds decreased gradually when the temperature were higher or lower than 25℃,and the lowest at 5℃ and 35℃;however,the non-photo-chemical quenching（NPQ）gradually rose with the increase or decrease of temperature,and till its maximum value at 10℃. The F_v/F_m and F_v'/F_m' values of the samples of 5℃ to 30℃ groups increased a bit after they were recovered at 25℃ for 2 d,and the highest increment occurred in 10℃ group. Meanwhile,the indexes did not change in the group of 33℃ and 35℃ after recovered cultivation. The results indicated that the most appropriate temperature for U. fasciata to grow and photo-synthesis was in a range of 15℃ to 30℃,5℃and 35℃ were the lowest and highest growth temperature respectively,and U. fasciata showed greater tolerance to low temperature than to high temperature.

Key words: Ulva fasciata, temperature, growth, chlorophyll fluorescence

HUANG Yan-hua, YANG Rui, SUN Qing-hai. Effect of Temperature on Growth and Chlorophyll Fluorescence of Ulva fasciata[J]. Biotechnology Bulletin, 2016, 32(7): 99-105.

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