Intraspecific variation in Pinus pinaster PSII photochemical efficiency in response to winter stress and freezing temperatures.

PLoS One · 2011 · PMC3248426 · PMID 22220195

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highly significantno p-value reported

Nevertheless, the small but highly significant population differences in photochemical performance that were expressed at the XE were related to the climatic origin of the seed source.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.