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. 2014 Apr 11;9(4):e85991. doi: 10.1371/journal.pone.0085991

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© 2014 An et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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A, diploid genotype; B, autotetraploid genotype; Parameters shown are Fv/Fm [maximal photosystem II (PSII) quantum yield], ΦPSII (effective PSII quantum yield) (at 185 µE m⁻² s⁻¹), and NPQ/4 (nonphotochemical quenching) (at 185 µE m⁻² s⁻¹). The color gradient provides a scale from 0 to 100% for assessing the magnitude of the parameters.