In the writer's previous work
1), it was reported that the spores of
Athyrium niponicum showed evidently in their germination behaviors a typical character of “Long Day Plant”. presenting the highest rate under continuous exposure to light. Then, by using spores of 15 species of Japanese-grown ferns, the writers investigated whether the tendency of “Long Day Plant” observed in the germination of
Athyrium spores applies, as a general tendency, to the germination behaviors of many other species of ferns.
First, under small intensity of light (10Lux), most of the experimented species were confirmed to belong to a type of “Long Day Plant”. Namely, as illuminating duration was lengthened, germination percentages went up progressively and reached the highest figure under continuous exposure to light. (Fig. 1). Secondly, the spores having a tendency of “Long Day Plant” were exposed to higher intensity of light (100 and 1000Lux). As a result, the following three tendencies were recognized in their germination behaviors. (1). Many species represented by
Dryopteris showed a tendency that the higher germination percentage was obtained by a low intensity to light (10lux) than by larger intensities (100Lux and 1000Lux). (Fig. 3). (2). In
Spicantopsis and
Asplenium, the germination behaviors were not affected by light intensity, but promoted exclusively by the length of illuminating period. (Fig. 4). (3). In
Pyrrosia, the germination behavior was the reverse to the tendency of
Dryopteris.
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