Effects of Elevated Irradiance, Temperature, and Rapid Shifts of Salinity on the Chlorophyll a Fluorescence (OJIP) Transient of Chattonella marina var. antiqua

Xuchun Qiu, Min Wu, Koki Mukai, Yohei Shimasaki, Yuji Oshima

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)293-300
Number of pages8
JournalJournal of the Faculty of Agriculture, Kyushu University
Volume64
Issue number2
DOIs
Publication statusPublished - 2019

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Agronomy and Crop Science

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