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The data suggest that constraint by the coat and megagametophyte was an important cause of slowness in southern pine (Pinus spp.) seed germination. As much as 69% of the variation in the speed of germination in five pine species was related to percentage coat weight among the three physical criteria measured. The validity of the constraint concept was supported by higher rates of water and oxygen uptake, increased size of megagametophytes during imbibition, and faster speed of germination of decoated seeds.
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James Paul Barnett (1976) studied this question.
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