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The diatom and the haptophyte often form blooms in the coastal waters of the South China Sea. commonly dominates in nutrient enrichment coastal waters, whereas . starts flourishing after the diatom blooms when phosphorus (P) is limited. Therefore, P limitation was proposed to be a critical factor affecting diatom-haptophyte transition. To elucidate the tolerance to P limitation in . compared with . , the effect of P limitation on their photosystem II (PSII) performance was investigated and their photosynthesis acclimation strategies in response to P limitation were evaluated. P limitation did not affect the growth of . over 7 days but decreased it for . . Correspondingly, the PSII activity of . was significantly inhibited by P limitation. The decline in PSII activity in . under P limitation was associated with the impairment of the oxygen-evolving complex (the donor side of PSII), the hindrance of electron transport from Q to Q (the acceptor side of PSII), and the inhibition of electron transport to photosystem I (PSI). The 100% decrease in D1 protein level of . after P limitation for 6 days and PsbO protein level after 2 days of P limitation were attributed to its enhanced photoinhibition. In contrast, . maintained its photosynthetic activity with minor impairment of the function of PSII. With accelerated PSII repair and highly increased non-photochemical quenching (NPQ), . can avoid serious PSII damage under P limitation. On the contrary, . decreased its D1 restoration under P limitation, and the maximum NPQ value in . was only one-sixth of that in . . The present work provides extensive evidence that a close interaction exists between the tolerance to P limitation and photosynthetic responses of . and . .
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9899818 | PMC |
| http://dx.doi.org/10.3389/fmicb.2023.1085176 | DOI Listing |
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