Phytochrome Regulation of Flowering in the Long-Day Plant, Hyoscyamus niger

Gibberellins (GA4+7) and gibberellin-like substances isolated from generatively induced black henbane (Hyoscyamus niger</> L.) bring about the growth of shoots and a partial differentiation of axillary meristem in black henbane plants grown under non-inductive light conditions. Long-lasting application of gibberellins, however, did not result in full development of flowers in the majority of the plants investigated. Thus, it seems, that gibberellins are not specific flowering hormones in black henbane - a long-day plant.

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A Quantitative and Cumulative Response to Photoperiodic Induction of Hyoscyamus niger, a Qualitative Long Day Plant

Zeitschrift für Pflanzenphysiologie ◽

10.1016/s0044-328x(82)80003-2 ◽

1982 ◽

Vol 105 (2) ◽

pp. 111-118 ◽

Cited By ~ 2

Author(s):

E. Warm ◽

W. Rau

Keyword(s):

Photoperiodic Induction ◽

Hyoscyamus Niger ◽

Long Day ◽

Cumulative Response

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Influence of night-breaks on flowering and phytohormones content in Hyoscyamus niger L.

Acta Societatis Botanicorum Poloniae ◽

10.5586/asbp.1982.005 ◽

2014 ◽

Vol 51 (1) ◽

pp. 51-58

Author(s):

Jan Kopcewicz ◽

Gabriela Centkowska

Keyword(s):

Shoot Growth ◽

Flower Formation ◽

Endogenous Hormones ◽

Hyoscyamus Niger ◽

General Increase ◽

Long Day ◽

Long Day Plants ◽

Inductive Photoperiod ◽

The Way

Night-breaks caused both stimulated shoot growth and caused formation of flowers as well as a general increase in the content of phytohormones in leaves of the long-day plant Hyoscyamus niger L. At the time of flower formation in night-break treated plants, new gibberellin-like substances also appear. The results show that night-breaks cause similar changes in the phytohormones content as a long inductive photoperiod. It may be assumed that independently of the way of induction, the generative differentiation of long-day plants is always accompanied by a general increase in the amount of endogenous hormones and the appearance of new gibberellins. These results suggest the possibility of a morphogenetic role of hormones, especially gibberellins, in the phenomena of flower formation and differentiation.

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OESTROGENS IN THE LONG-DAY PLANTS HYOSCYAMUS NIGER AND SALVIA SPLENDENS GROWN UNDER INDUCTIVE AND NON-INDUCTIVE LIGHT CONDITIONS

New Phytologist ◽

10.1111/j.1469-8137.1972.tb04819.x ◽

1972 ◽

Vol 71 (1) ◽

pp. 129-134 ◽

Cited By ~ 15

Author(s):

JAN KOPCEWICZ

Keyword(s):

Light Conditions ◽

Hyoscyamus Niger ◽

Long Day ◽

Salvia Splendens ◽

Long Day Plants

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Investigation of Hyoscyamus Niger L., A Long-Day Plant, for Endodiurnal Periodicity in Flowering Response

PLANT PHYSIOLOGY ◽

10.1104/pp.35.6.982 ◽

1960 ◽

Vol 35 (6) ◽

pp. 982-985 ◽

Cited By ~ 7

Author(s):

James C. Finn ◽

Karl C. Hamner

Keyword(s):

Hyoscyamus Niger ◽

Flowering Response ◽

Long Day

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Phytohormones level in the leaves of Hyoscyamus niger L. during variable photoperiods at the time of flower initiation and differentiation

Acta Societatis Botanicorum Poloniae ◽

10.5586/asbp.1980.022 ◽

2014 ◽

Vol 49 (3) ◽

pp. 245-258

Author(s):

Jan Kopcewicz ◽

Gabriela Centkowska ◽

Krystyna Kriesel

Keyword(s):

Abscisic Acid ◽

Flower Initiation ◽

Hyoscyamus Niger ◽

Long Day ◽

General Decrease ◽

Before And After ◽

Endogenous Phytohormones ◽

Quantitative Changes ◽

Inductive Photoperiod ◽

Short Days

The investigations concern changes in the content of endogenous phytohormones in the leaves of the long-day plant Hyoscyamus niger L. during variable photoperiods applied before and after flower initiation. The results show that alternation of inductive photoperiods with short days leads to quantitative changes in the content of phytohormones. The changeable photoperiod leads to a general decrease in the contents of gibberellins, cytokinins and auxins during the short noninductive days both before and after flower initiation. Alternation of the inductive photoperiod with short days does not influence the content of abscisic acid-like substances before flower initiation and causes an increase of the amount of inhibitors in the postinductive period. The content of hormonal substances is subjected to rhytmical changes related to the periods of light and darkness in the twenty-four hours' cycle.

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The effect of inductive photoperiod on flower formation and phytohormones level in a long day plant Hyoscyamus niger L.

Acta Societatis Botanicorum Poloniae ◽

10.5586/asbp.1979.021 ◽

2015 ◽

Vol 48 (2) ◽

pp. 255-265 ◽

Cited By ~ 4

Author(s):

J. Kopcewicz ◽

G. Centkowska ◽

K. Kriesel ◽

Y. Yatorska

Keyword(s):

Short Photoperiod ◽

Flower Formation ◽

Flower Initiation ◽

Hyoscyamus Niger ◽

General Increase ◽

Long Day ◽

Inductive Photoperiod ◽

Inductive Period

The anatomical and hormonal investigations on a long day plant Hyoscyamus niger L. during the time of the generative photoinduction have been conducted. The plants were grown during 75 days on a short photoperiod and then they were transferred to long day conditions. The earliest anatomical symptoms of flower initiation were noticed after four long photoperiods. The inductive photoperiod causes also a general increase in the amounts of phytohormones. During the flower evocation the intensive accumulation of cytokinins and gibberellins in leaves takes place. The post-inductive period, in which the development of flower elements happens, is characterized by changing amount of phytohormones. The content of hormonal substances is subjected to the rhytmical changes related to the periods of light and darknees in the twenty four hours' cycle.

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