Hormones in Photoperiodic Flower Induction

Lamium maculatum L. `White Nancy', Scaevola aemula R. `New Blue Wonder', Verbena × hybrida Groenl. & Ruempl. `Tapian Blue', and Calibracoa × hybrida `Cherry Pink' were placed under different photoperiod treatments at constant 15, 20, 25, or 30 ± 2°C air temperature. Photoperiod treatments were 9 hr, ambient daylight (≈8 hr) plus night interruption lighting (2200–0200 hr, 2 μmol·m–2·s–1 from incandescent lamps), or ambient daylight plus continuous light (100 μmol·m–2·s–1 light from high-pressure sodium lamps). Data on plant development and rootability of cuttings from each environment was collected. Days to anthesis was lowest when plants were grown under the continuous lighting treatment across species. Verbena and Calibracoa stem elongation was greatest when grown under 30°C under continuous lighting. Species were classified as to photoperiodic flower induction groups. Implications of these data with respect to propagating and finishing these crops are discussed.

Download Full-text

Photoperiodic flower induction in Ipomoea nil is accompanied by decreasing content of gibberellins

Plant Growth Regulation ◽

10.1007/s10725-017-0344-6 ◽

2017 ◽

Vol 84 (2) ◽

pp. 395-400 ◽

Cited By ~ 5

Author(s):

Katarzyna Marciniak ◽

Agata Kućko ◽

Emilia Wilmowicz ◽

Michał Świdziński ◽

Jacek Kęsy ◽

...

Keyword(s):

Flower Induction ◽

Ipomoea Nil ◽

Photoperiodic Flower Induction

Download Full-text

The level of phyA in Pharbitis nil Chois during the photoperiodic flower induction

Acta Societatis Botanicorum Poloniae ◽

10.5586/asbp.2000.035 ◽

2014 ◽

Vol 69 (4) ◽

pp. 269-272 ◽

Cited By ~ 1

Author(s):

Adriana Szmidt-Jaworska ◽

Krzysztof Jaworski ◽

Jan Kopcewicz

Keyword(s):

Dark Period ◽

Polyclonal Antibodies ◽

Flower Induction ◽

Pharbitis Nil ◽

Light Illumination ◽

Direct Control ◽

Short Day ◽

Rapid Destruction ◽

Photoperiodic Flower Induction

The aim of this work was to determine if there is any relationship between an endogenous phyA level and photoperiodic flower induction. The level of phyA was characterised with polyclonal antibodies directed to phyA from pea. At first it was detected that phyA level is predominant in cotyledons, whereas in roots and stems the concentration of labile phytochrome is rather low. So cotyledons were used for later experiments. In these cotyledons exposed to light illumination a rapid destruction of phyA has been observed. The loss of extractable phyA chromoprotein occurs already after 60 min of irradiation. <em>Pharbitis nil</em> is a short-day plant and a single 16-hours-long dark period is fully inductive. We assessed that phyA level is extremely low during a long inductive night and an immunodetectable phytochrome appears only after 24 hours of darkness. The obtained results suggest that labile phytochrome is not taking part in the direct control of the photoperiodic flower induction.

Download Full-text