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Studies on the long‐day inhibition of flowering in Xanthium and Kalanchoe
Author(s) -
Papafotiou Maria,
Schwabe Walter W.
Publication year - 1990
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1990.tb04393.x
Subject(s) - xanthium , kalanchoe , crassulaceae , botany , meristem , biology , apex (geometry) , stimulus (psychology) , horticulture , psychology , shoot , psychotherapist
It is well known in short‐day plants that a leaf held in non‐inductive photoperiods inhibits flowering when interposed between the induced leaf and the apical meristem, in an analogous manner to the basal half of a leaf induced by short‐day in its distal half. This has often been explained by the inhibiting leaf or basal part of an induced leaf becoming the major source of carbohydrates to the apex, rather than the induced leaf itself; i.e. by preventing thus the co‐transported stimulus from reaching the apex. Experiments with Kalanchoe blossfeldiana Poellniz and Xanthium strumarium L. in which carbon dioxide levels were lowered or increased, or 3‐(3,4‐dichlorophenyl)‐1,1‐dimethylurea injected, or sugar fed to the petioles of a debladed interposed leaf, or night‐breaks given as well as other photoperiodic treatments, all pointed to ‘carbohydrate diversion’ not being the major cause of failure of the short‐day stimulus reaching the target apex. It is tentatively concluded that instead an inhibitory action occurs in the vascular passage of the stimulus preventing co‐transport with the carrier molecule.