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)

The effect of photoperiod and temperature on the first crop and ratoon growth of Pennisetum purpureum Schum

1978 ◽  
Vol 29 (5) ◽  
pp. 941 ◽  
Author(s):  
R Ferraris
Keyword(s):  
Dry Matter ◽  
Stem Elongation ◽  
Main Stem ◽  
Pennisetum Purpureum ◽  
Short Day ◽  
Long Day ◽  
Appearance Rate ◽  
Leaf Appearance Rate ◽  
Higher Temperature ◽  
Leaf Appearance

Elephant grass (Pennisetum purpureum Schum.) was grown in phytotron cabinets for 60 days at 30/25° or 21/16°C (daylnight) in either 8 or 16 hr photoperiods. During the juvenile phase the higher temperature increased the leaf appearance rate, tillering rate and main stem elongation rate. Once plants in the 8 hr photoperiod became reproductive, the stem elongation, tillering rate and leaf appearance rate increased. The higher temperature continued to stimulate development. At harvest at 60 days plants grown at 30/25° had higher leaf, stem and total dry matter yields, a greater leaf area but lower carbohydrate content in the stubble. The 16 hr photoperiod produced higher dry matter yields at harvest than the 8 hr photoperiod. A comparison pot experiment grown in short day and long day photoperiods under field conditions in north Queensland produced similar findings to the phytotron experiment. After harvest, stubbles were ratooned into either short day (8 hr) or long day (16 hr) photoperiods, the temperature difference being maintained. Leaf number per main stem and main stem elongation were similar to those of the first crop, but more tillers and higher yields were produced in the ratoon crop. Temperature and photoperiod effects were similar in both crops. It was concluded that low temperatures rather than reduced photoperiod would be the greatest limitation to the adaptation of the species as an industrial or forage crop where yearround production is required.

scholarly journals Gibberellic Acid Effect on Growth and Flowering of Ajania Pacifica /Nakai/ Bremer et Humphries

2013 ◽  
Vol 21 (1) ◽  
pp. 21-27 ◽  
Author(s):  
Małgorzata Zalewska ◽  
Małgorzata Antkowiak
Keyword(s):  
Gibberellic Acid ◽  
Vegetative Growth ◽  
Distilled Water ◽  
Water Control ◽  
Cultivation Time ◽  
Short Day ◽  
Long Day ◽  
Acid Effect ◽  
Ornamental Species ◽  
Effect On Growth

Abstract The research addressed the effect of gibberellic acid (GA3) on growth and flowering of Ajania pacifica /Nakai/ Bremer et Humphries ‘Bea’. The vegetative growth lasted for 8 weeks in glasshouse, under natural long day and from August 15 - under natural short day. The plants were divided into four groups: 1 - the plants sprayed with distilled water (control combination); 2, 3 and 4 - the plants sprayed with GA3 ones, twice and thrice, respectively, starting from the 5th week of growth, and then in the 6th and 7th week, successively. Each of the group was divided into two subgroups: the first one treated with GA3 at concentration of 250 mg·dm-3 and the second with 500 mg·dm-3. It was observed that double spraying with GA3 accelerated the buds development of Ajania pacifica, thus shortened the cultivation time by about two days. Treatment with GA3 at concentration 500 mg·dm-3 stimulated the elongation of shoots more than treatment with GA3 at 250 mg·dm-3. The plants sprayed twice were longer than the control and then those sprayed one time. However, elongation of shoots was not remarkable; corymbs were shorter, narrower, and contained lesser number of inflorescences. The present study indicates the specificity of the response of Ajania pacifica to GA3 treatment, which appears to be different from other ornamental species.

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.

scholarly journals Gibberellins in Relation to Flowering and Stem Elongation in the Long Day Plant Silene armeria

1970 ◽  
Vol 46 (3) ◽  
pp. 392-400 ◽  
Author(s):  
Charles F. Cleland ◽  
Jan A. D. Zeevaart
Keyword(s):  
Stem Elongation ◽  
Long Day ◽  
Silene Armeria
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