Flower formation induced by kinetin and vitamin E treatment in long-day plant (Arabidopsis thaliana) grown in short day

1965 ◽  
Vol 52 (22) ◽  
pp. 623-623 ◽  
Author(s):  
Marian Michniewicz ◽  
Aniela Kamieńska
Keyword(s):  
Arabidopsis Thaliana ◽  
Vitamin E ◽  
Flower Formation ◽  
Short Day ◽  
Long Day ◽  
Plant Arabidopsis Thaliana

scholarly journals Gibberellic acid flower formation and stem elongation in Silene armeria.

1973 ◽  
Vol 21 (4) ◽  
pp. 245-255
Author(s):  
S.J. Wellensiek
Keyword(s):  
Gibberellic Acid ◽  
Stem Elongation ◽  
Flowering Plants ◽  
Plant Age ◽  
Flower Formation ◽  
High Concentration ◽  
Short Day ◽  
Long Day ◽  
Silene Armeria

Several selected S. armeria lines differing in their reaction to GA3 were treated with GA3 at various concentrations under short-day (SD) or long-day conditions. With SD treatment one application of GA3 at high concentration (10 000 p.p.m. or greater) induced flower formation in certain lines. Stem elongation increased with GA3 concentration and with plant age and was much greater on flowering plants than on non-flowering ones. [For previous related work see HcA 41, 4400.]. (Abstract retrieved from CAB Abstracts by CABI’s permission)

Phytochrome, photosynthesis and flowering of Arabidopsis thaliana: photophysiological studies using mutants and transgenic lines

2001 ◽  
Vol 28 (5) ◽  
pp. 401 ◽  
Author(s):  
David J. Bagnall ◽  
Rod W. King
Keyword(s):  
Arabidopsis Thaliana ◽  
Photoperiodic Response ◽  
High Irradiance ◽  
Phytochrome A ◽  
Wild Type ◽  
Long Day ◽  
Transgenic Lines ◽  
A Minor ◽  
Type Response ◽  
Plant Arabidopsis Thaliana

A number of phytochrome mutants have been examined for involvement in high irradiance (HIR) or red/far-red (R/FR) end-of-day (EOD) photoresponses during flowering of the long-day (LD) plant, Arabidopsis thaliana (L.) Heynh. A large component of phytochrome A (phyA) response is shown to involve an indirect effect via photosynthesis. When grown autotrophically in soil at a low irradiance (80 mol m–2 s–1), the phyA-211 mutant flowered extremely late compared with wild type and its leaf area was halved, both effects being reversed by increase in photosynthetic irradiance. Supplying sucrose via agar led to very early flowering with little indication of an additional direct phyA HIR. For light-stable phytochrome apoprotein mutants (phyB, phyD) or chromophore mutants (hy1, hy2), flowering was early and R/FR photoreversible EOD response was erased. Conversely, flowering was delayed in a transgenic line overexpressing the PHYB apoprotein. The FR EOD promotion of flowering via phyB was retained in darkness, brief night interruptions mimicking LD response. This novel finding emphasizes the importance of phyB-like phytochromes, with phyA acting indirectly. Whether phyB influences time measurement remains uncertain as we found no rhythmicity in this response to night interruptions. Overall, the role(s) of phytochromes in the regulation of flowering of Arabidopsis include EOD phyB-type response, a minor phyA photoperiodic response, and a large indirect phyA effect involving photosynthesis.

Induction photopériodique de l'organogenèse et de la floraison in vitro chez le Cichorium intybus: aspects histologiques

1992 ◽  
Vol 70 (6) ◽  
pp. 1302-1311 ◽  
Author(s):  
Karima Mikou ◽  
Philippe Badila
Keyword(s):  
Structural Changes ◽  
Cichorium Intybus ◽  
Fluorescent Light ◽  
Flower Formation ◽  
Root Explants ◽  
Subsequent Formation ◽  
Flower Primordia ◽  
Short Day ◽  
Long Day

In root explants of a long-day plant, Cichorium intybus L., grown in vitro, inflorescences were produced under short-day conditions (9 h) if long days were applied on days 10 to 18 of culture. Long days consisted of either 16 h fluorescent light (5.6 W∙m−2) or daily cycles of 9 h white fluorescent plus 15 h red (660 nm, 0.3 W∙m−2) or blue (440 nm, 0.5 W∙m−2) light. The structural changes in the meristems of buds regenerated under these conditions were studied. The influence of photoperiod appeared to be critical between the 10th and 16th days, during the progressive transition from vegetative to prefloral stage, which occurred more rapidly under photoperiodic conditions with red or blue light. In noninductive short days, intermediate meristems could be observed tardily on day 24, but no flower formation took place after transfer to long days. Increasing the quantity of light under short-day conditions up to a level comparable to long-day conditions resulted in a rise in mitotic activity, mainly in the peripheral zone of the meristem, but the vegetative zonation was retained. These data therefore indicate that the duration of light really commits the meristem to the subsequent formation of flower primordia; in contrast, the quantity of light controls the bud formation during the first part of development. Key words: Cichorium, tissue cultures, flowering, meristems, organogenesis, photoperiodism.

THE EFFECTS OF SHORT DAYS ON FRUITSET AS DISTINCT FROM FLOWER FORMATION IN SOYBEANS

1963 ◽  
Vol 41 (6) ◽  
pp. 871-873 ◽  
Author(s):  
J. E. Fisher
Keyword(s):  
Flower Formation ◽  
Flowering Period ◽  
Viable Pollen ◽  
Short Day ◽  
Long Day ◽  
Beginning Of Flowering ◽  
Long Day Plants ◽  
Short Days

Certain soybean varieties flowered, but did not set fruit under 20-hour photoperiods. Three short (12-hour) photoperiods applied 1 or more weeks after the beginning of flowering induced fruitset which continued throughout the flowering period. One short day was not sufficient. Three short days given to vegetative plants before flowering induced earlier flowering but not fruitset. Short-day treatments applied at the first sign of flowering were also ineffective. Flowering but non-fruiting long-day plants did not produce normal anthers of viable pollen. Individual flowers set fruit if fertilized with viable pollen from plants grown continuously under short days.

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