An Age-Dependent Change in the Response of Fern Gametophytes to Red Light

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Science  17 Nov 1961:
Vol. 134, Issue 3490, pp. 1629
DOI: 10.1126/science.134.3490.1629


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.