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- Title
Negative Gravitropism in Dark-Grown Gametophytes of the Fern Ceratopteris richardii.
- Authors
KAMACHI, HIROYUKI; NOGUCHI, MUNENORI
- Abstract
This study examined whether gravity influences the growth direction of dark-grown gametophytes of the fern Ceratopteris richardii. Analyses of directional growth of gametophytes in response to gravitropic stimulation demonstrated that gametophytes showed negative gravitropism. Dark-grown gametophytes of dkgl herl mutants, which germinate in complete darkness, displayed a more distinct negative gravitropism. Unlike herl spores, dkgl herl spores do riot require light irradiation to induce spore germination. Therefore, light irradiation on herl spores was possibly inhibiting the negative gravitropism of herl gametophytes. In the present study, prolonged white-light irradiation on herl spores inhibited negative gravitropism in the gametophytes. Light irradiation on spores therefore affects the later negative gravitropism of dark-grown gametophytes.
- Subjects
GEOTROPISM; CERATOPTERIS; FERN gametophytes; IRRADIATION; PLANT spores; GERMINATION; CERATOPTERIS richardii
- Publication
American Fern Journal, 2012, Vol 102, Issue 2, p147
- ISSN
0002-8444
- Publication type
Article
- DOI
10.1640/0002-8444-102.2.147