An Age-Dependent Change in the Response of Fern Gametophytes to Red Light.
When gametophytes of Onoclea sensibilis are grown in darkness a filament of a few cells develops which elongates at a constant rate. Low dosages of red light given at the beginning of growth increase the rate of elongation. After about 12 days in darkness, however, gametophytes show a decreased growth rate when given red light.
Miller
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Wright
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