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Photosystem II- and photosystem I-inhibitor herbicides-driven changes in the dynamics of photosynthetic energy dissipation of Conyza spp.

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Abstract

The quick detection and knowledge on dynamic dissipation of photosynthetic energy processes may improve weed management. This work aimed to evaluate the dynamic dissipation of photosynthetic energy of fleabane (Conyza spp.) upon PSII- and PSI-inhibitor (photosystem I and II) herbicides application. Treatments were comprised of the application of metribuzin (PSII) and paraquat (PSI), following recommended doses for fleabane plants (40 days after germination: 10 to 12 leaves), and an untreated check. Chlorophyll a fluorescence transient was performed at 0.5, 1, 2, 4, 8, 24, 48 and 96 h after application (HAA) and gas exchange analysis was performed at 2, 4 and 96 HAA. Injury symptoms analysis was performed at all previously mentioned time points plus 7, 14, 21, and 28 days after application (DAA). Injury symptoms were observed at 7 DAA and 2 HAA of PSII- and PSI-inhibitors, respectively, while changes in the dynamic dissipation of photosynthetic energy were observed in both cases at 0.5 HAA. At 0.5 and 1 HAA, plants showed a decrease in QA (quinone) re-oxidation per reaction center and reduction in electron transport yield from QA to the end electron acceptor of the PSI, for both herbicides. Moreover, plants showed a 90% decline in the performance index and an increase in energy dissipation as heat and fluorescence. Fleabane showed a significant decrease in net assimilation rate (CO2), transpiration rate and stomatal conductance within 1 HAA, for both herbicides. Therefore, PSII- and PSI-inhibitor herbicides presented a rapid negative effect on photosynthetic energy dynamics that can be monitored before the appearance of injury symptoms, which demonstrates the potential use of chlorophyll fluorescence in the rapid screening of metabolic perturbations caused by herbicides.

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The datasets generated during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001 and Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ).

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Correspondence to Junior Borella.

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Communicated by W. Zhou.

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Leal, J.F.L., Borella, J., dos Santos Souza, A. et al. Photosystem II- and photosystem I-inhibitor herbicides-driven changes in the dynamics of photosynthetic energy dissipation of Conyza spp.. Acta Physiol Plant 45, 94 (2023). https://doi.org/10.1007/s11738-023-03572-1

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  • DOI: https://doi.org/10.1007/s11738-023-03572-1

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