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RHYTHM OF LEAF DEVELOPMENT AND SENSITIVITY TO PHOTOPERIODIC FLORAL INDUCTION
Author(s) -
Jacobs William P.
Publication year - 1972
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1972.tb10114.x
Subject(s) - biology , photoperiodism , xanthium , perilla , phyllotaxis , botany , long day , day length , flower induction , rhythm , horticulture , ecology , medicine , shoot , raw material , meristem
Some plants require only one 24‐hr cycle of the appropriate photoperiod to be induced to flower; others require seven or more. To try to understand the basis for this striking difference, the length of the leaf plastochron was determined for Xanthium and Perilla in the same experiments in which their sensitivity to various numbers of photoperiodic cycles was measured. The general finding was that for full floral induction there had to be as many 24‐hr inductive cycles as there were days in the plastochron. When the total days in the plastochron were altered by environmental manipulation, the cycles required for floral induction altered in parallel.