Chattonella spp. often experience a broad variety of environmental changes in coastal areas. However, insights into their stress responses to shifts of environmental factors remains largely unknown. In this study, we investigated responses in the OJIP transient of C. marina var. antiqua grown under various culture conditions. Short-term irradiance shifts experiment showed that a 4-h exposure to elevated irradiance (EI, 1100 ± 50 μmol photons m-2s-1) significantly decreased the Fv/Fmratio, PIABS, and ETo/RC, while increased the ABS/RC, TRo/RC, and DIo/RC of Chattonella cells. When the cells were shifted back to the control irradiance (CI, 110 ± 10 μmol photons m-2s-1), all the above parameters recovered to normal status within 3 h. During batch cultures, repeated irradiance shifts (exposure to EI for 4 h per day) significantly decreased the maximum cell densities of C. marina var. antiqua (to 64% of that in control), but did not affect the maximum growth rate. The decrease of PIABS could recover to normal status at the next morning at the exponential phase, suggesting the importance of weak light intensity in morning and evening for the recovery from photoinhibition and consequent algal growth in actual environment. But PIABS level did not completely recover at the stationary phase. The interaction of temperature and rapid salinity shifts played significant roles in mediating growth rate, Fv /Fm ratio, and PIABS of C. marina var. antiqua. Despite water temperatures, rapid salinity shifts from 30 to 10 tended to notably decrease growth and photosynthetic activity of C. marina var. antiqua.
|ジャーナル||Journal of the Faculty of Agriculture, Kyushu University|
|出版ステータス||出版済み - 2019|
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