Length of Day and Temperature Effects in Rudbeckia
| Autor: | A. E. Murneek |
|---|---|
| Rok vydání: | 1940 |
| Předmět: |
photoperiodism
endocrine system biology media_common.quotation_subject Stem elongation food and beverages Rudbeckia biology.organism_classification Sexual reproduction Rosette (botany) Horticulture biological sciences Botany General Earth and Planetary Sciences Day length Reproduction hormones hormone substitutes and hormone antagonists reproductive and urinary physiology General Environmental Science media_common |
| Zdroj: | Botanical Gazette. 102:269-279 |
| ISSN: | 0006-8071 |
| DOI: | 10.1086/334957 |
| Popis: | 1. Growth in height occurs and sexual reproduction is initiated and maintained in Rudbeckia bicolor under a photoperiod exceeding 12 hours. In short photoperiod, less than 12 hours, the plants remain in a rosette type of development (photoperiodic inhibition) and do not produce flowers. 2. Reproduction may be induced (photoperiodic induction) to various extents by exposure to a certain number of long days. Floral organs continue to develop and may function normally when plants are placed under short-day treatment. 3. Stem elongation cannot be induced by but only maintained on long photoperiods. Growth in height stops promptly when R. bicolor plants are switched from long to short photoperiod. 4. Photoperiodic induction and photoperiodic inhibition may be combined in various ways by exposing plants to appropriate combinations of long and short days. Thereby the size and form of the vegetative parts and the amount and character of development of reproductive tissues may be changed. Vegetative flowers and le... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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