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Circannual Growth Rhythm in a Brown Alga, Pterygophora californica
Author(s) -
Lüning K.
Publication year - 1991
Publication title -
botanica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0932-8629
DOI - 10.1111/j.1438-8677.1991.tb00211.x
Subject(s) - entrainment (biomusicology) , rhythm , circannual rhythm , biology , photoperiodism , annual cycle , circadian rhythm , zoology , botany , ecology , medicine , endocrinology
A circannual rhythm was found in the kelp Pterygophora californica which forms a new blade with a free running period of 7 − 8 months under constant conditions. Individual plants exposed to cycles of daylength with T = 12, 6, or 3 months performed 1, 2, or 4 growth cycles, respectively, in one calendar year showing the entrainment of the endogenous circannual rhythm. The annual growth cycle also followed a phase shift of the annual cycle of daylength (T = 12 months) by 3 or 6 months.