Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
RESEARCH ARTICLE

PSI becomes more tolerant to fluoranthene through the initiation of cyclic electron flow

Rupal Singh Tomar A and Anjana Jajoo A B
+ Author Affiliations
- Author Affiliations

A School of Life Science, Devi Ahilya University, Indore 452017, M.P. India.

B Corresponding author. Email: anjanajajoo@hotmail.com

Functional Plant Biology 44(10) 978-984 https://doi.org/10.1071/FP17121
Submitted: 26 April 2017  Accepted: 9 June 2017   Published: 14 July 2017

Abstract

Environmental pollution by organic compounds such as polycyclic aromatic hydrocarbons (PAHs) poses a potential ecological risk to photosynthetic organisms. In the present study, the toxic effects of fluoranthene (FLT) on the energy conversion of PSI and PSII in wheat (Triticum aestivum L.) plants were studied. By evaluating the performance of both PSI and PSII, which act as an internal environmental sensor, it was revealed that activity of both photosystems was negatively affected by FLT treatment. However, the quantum yield of PSII, Y(II), was reduced at 5 µM FLT, whereas the quantum yield of PSI, Y(I), significantly decreased at 25 µM FLT. The decline in Y(II) was accompanied by an increase in nonregulated energy dissipation, Y(NO). The decrease in Y(I) induced by FLT was caused by donor-side, and acceptor side limitation of PSI. Cyclic electron flow (CEF) was activated only at higher concentrations and was associated with the inhibition of linear electron flow (LEF) after exposure to a higher concentration of FLT. The inhibition of LEF and induction of CEF seems to be essential for the tolerance of PSI to FLT toxicity.

Additional keywords: polycyclic aromatic hydrocarbons, PSII, Triticum aestivum, wheat.


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