Photoperiodic Induction as Influenced by Environmental Factors

@article{Long1939PhotoperiodicIA,
  title={Photoperiodic Induction as Influenced by Environmental Factors},
  author={E. M. Long},
  journal={Botanical Gazette},
  year={1939},
  volume={101},
  pages={168 - 188}
}
1. The leaves of Xanthium plants are the locus of photoperiodic induction. Induced leaves, when grafted to vegetative plants, continue to supply a stimulus for flower initiation when exposed to continuous long photoperiod. 2. If during each 24-hour period, Xanthium plants are exposed to 5-hour dark periods at 40⚬ F. alternating with 9-hour photoperiods at approximately 70⚬, then six to eight such consecutive cycles of dark period and photoperiod are required for photoperiodic induction. A… Expand
Effect of Some Environmental Factors on Floral Initiation in Xanthium
  • L. Mann
  • Biology
  • Botanical Gazette
  • 1940
TLDR
Data is given showing the influence of the number of photoinductive cycles to which plants are exposed on the rate of development of flower structures and the photoperiod following a long dark period has a pronounced effect on the initiation and development of flowers. Expand
Effects of some Environmental Factors on Photoperiodic Induction of Beet and Dill
TLDR
Red light of wave lengths greater than 580 μ are capable of inducing the flowering response in dill when used as the sole source of illumination during the induction period, and continuous illumination with 900-1000 foot-candles of light from white fluorescent Mazda lamps, under conditions of only slight temperature fluctuation, was conducive to flowering in beet. Expand
Interrelations among Effects of Temperature, Photoperiod, and Dark Period on Floral Initiation of Biloxi Soybean
TLDR
The flowering response in Biloxi soybean is apparently influenced to a marked degree by some endogenous rhythm of 24 hours' duration, which might explain the results obtained with cycles of different durations at both normal and low temperatures. Expand
Photoperiodism, floral induction and floral inhibition in Salvia occidentalis
Day lengths of 2-4 h were suboptimal for flowering induction, those of 4-12 h optimal, those of 12.5-3 h supra-optimal, and those of 13.5 critical. The first sign of transition from a vegetative to aExpand
Interrelation of Light and Darkness in Photoperiodic Induction
TLDR
Experimental evidence has indicated that in both the soybean and Xanthium photoperiodic induction is dependent in part upon responses which occur as the result of exposure to light, and those owing to darkness as B, and the resultant changes related to A and B may be referred to as C. Expand
Influence of Localized Low Temperature on Biloxi Soybean During Photoperiodic Induction
TLDR
Petiole-cooling experiments involving plants with two leaves indicate that inhibition of flowering resulted from the influence of low temperature on the transport of a flower-forming stimulus. Expand
Effects of Intercalated Long Days on Photoperiodic Induction and Development of Flowers and Fruits in Abelmoschus esculentus (L.) Moench.
Summary Plants of Abelmoschus esculentus aged 10 days require a minimum of 4 consecutive SD cycles for the induction of flower buds (in all plants). Insertion of a single LD among them preventsExpand
Photoperiodic effects in Vigna unguiculata (L.) Walp.
TLDR
Experiments on vegetative growth were mainly with varieties whose growth was inhibited in short days before the onset of flowering (not reversed by subsequent long days (LD), whereas in LD growth continued for at least 6 to 7 months. Expand
RHYTHM OF LEAF DEVELOPMENT AND SENSITIVITY TO PHOTOPERIODIC FLORAL INDUCTION
TLDR
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, and 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. Expand
Effect of Intercalated Long Days and Light Interruption of Dark Period on Flowering, Extension Growth and Senescence of impatiens balsamina
TLDR
The floral buds are initiated and these develop into flowers even when Individual SDs are intercalated with 16 LD cycles, showing that the sub-threshold stimulus is not wiped off but becomes effectively summated through a long non-inductive period. Expand
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Photoperiodism in Relation to Hormones as Factors in Floral Initiation and Development
TLDR
Evidence is presented that the floral initiation substance is not identical with any of the following known plant growth factors: vitamins B1, B2, and B6, ascorbic acid, nicotinic Acid, pantothenic acid), theelin, theelol, inositol, or indoleacetic acid. Expand
COMPARATIVE RESPONSES OF LONG-DAY AND SHORT-DAY PLANTS TO RELATIVE LENGTH OF DAY AND NIGHT.
The primary purpose of the present discussion is to contrast the behavior of the so-called long-day and short-day types of plants in terms of their response to differences in length of day and toExpand
Contribution a la theorie du photoperi - odisme . II . Compt
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  • 1937
Contribution a la theorie du photoperiodisme
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