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A Synechococcus sp. PCC 7942 mutant with a higher tolerance towards bentazone

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Abstract

In this article we describe the partial characterization of a Synechococcus sp. PCC 7942 mutant Mu1 with an enhanced resistance towards the herbicide bentazone (3-isopropyl-1H-2,1,3-benzothiadiazine-4(3H)-one 2,2-dioxide). The mutant was derived from a random mutagenesis with N-methyl-N′-nitro-N-nitrosoguanidine (NSG) and exhibited superior growth rates, pigment content and overall photosynthetic activities under regular growth conditions compared to wild type. Whereas Synechococcus PCC 7942 wild type showed significant photoinhibition, especially in the presence of lincomycin, Mu1 was much more robust. A comparative analysis of the content of several photosynthesis-associated proteins revealed that Mu1 had an increased expression of PsbO on mRNA and protein level and that PsbO is tightly bound to Photosystem II, relative to wild type. This result was substantiated by mass spectrometer measurements of photosynthetic water oxidation revealing a higher stability and integrity of the water oxidizing complex in Mu1 cells grown under regular or calcium deficient conditions. Therefore, our results give rise to the possibility that the overexpression of PsbO in mutant Mu1 confers resistance to reactive oxygen species (ROS) formed as a consequence of bentazone binding to the acceptor side of PS II. In addition, we observed a significantly higher tolerance towards bentazone in iron depleted wild type cells, conditions under which the IdiA protein becomes expressed in highly elevated amounts. As we have previously shown, IdiA preferentially protects the acceptor site of PS II against oxidative stress, especially under iron limitation. Thus, it is likely that IdiA due to its topology interferes with bentazone binding or protects PS II against ROS generated in the presence of bentazone.

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Author notes

  1. Suvendra N. Bagchi

    Present address: Department of Biological Sciences, Rani Durgavati University, Jabalpur-, 482001, India

Authors and Affiliations

  1. Biologie VIII: Zellphysiologie, Universität Bielefeld, D33615, Bielefeld, Germany

    Suvendra N. Bagchi, Elfriede K. Pistorius & Klaus-Peter Michel

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  1. Suvendra N. Bagchi
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  2. Elfriede K. Pistorius
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  3. Klaus-Peter Michel
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Correspondence to Elfriede K. Pistorius.

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Bagchi, S.N., Pistorius, E.K. & Michel, KP. A Synechococcus sp. PCC 7942 mutant with a higher tolerance towards bentazone. Photosynthesis Research 75, 171–182 (2003). https://doi.org/10.1023/A:1022836218176

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