scholarly journals A dark–light transition triggers expression of the floral promoter CrFTL1 and downregulates CONSTANS-like genes in a short-day plant Chenopodium rubrum

2014 ◽  
Vol 65 (8) ◽  
pp. 2137-2146 ◽  
Author(s):  
Jana Drabešová ◽  
David Cháb ◽  
Jan Kolář ◽  
Kateřina Haškovcová ◽  
Helena Štorchová
Keyword(s):  
Chenopodium Rubrum ◽  
Dark Light ◽  
Short Day

Phytochrome Action in the Induction of Plowering in Short-day Plants: Effect of Photoperiod Quality

1974 ◽  
Vol 1 (3) ◽  
pp. 445 ◽  
Author(s):  
RW King
Keyword(s):  
Photosynthetic Pigments ◽  
Prolonged Exposure ◽  
Dark Period ◽  
Red Light ◽  
Spectral Composition ◽  
Chenopodium Rubrum ◽  
Fluorescent Light ◽  
Flowering Response ◽  
Short Day ◽  
Red Radiation

Seedlings of Phavbitis nil and Chenopodium rubrum flower in response to a single inductive dark period preceded and followed by continuous fluorescent light. However, when a far-red irradiation for 1 h or longer was substituted for fluorescent light, the flowering response to an ensuing dark period could be completely inhibited or enhanced up to threefold depending on when the far-red exposure commenced. Evidence of red/far-red photoreversibility established phytochrome as the photoreceptor controlling these responses. There was no indication of the involvement of photosynthetic pigments. For P. nil prolonged exposure (1.5-6 h) to far-red radiation during the photoperiod could shorten (2-3 h) or lengthen (2 h) the duration of darkness required for flowering. The degree of change depended on whether the far-red radiation was imposed just prior to darkness (shortening) or about 9 h prior to darkness (lengthening). In a similar manner the spectral composition of the photoperiod influenced the timing during darkness for earliest sensitivity to brief (5 min) red light interruptions. The shorter the critical dark period, the earlier in darkness the seedlings became sensitive to red light interruptions of darkness. It is clear that the form of phytochrome during the photoperiod influences the timing of phytochrome- linked processes in darkness. Two explanations discussed are a coupling via rhythmic changes in substrate on which phytochrome acts, and an effect on phytochrome reactions which alters the timing of Pf, disappearance during a subsequent dark period.

Exogenously applied melatonin (N -acetyl-5-methoxytryptamine) affects flowering of the short-day plant Chenopodium rubrum

2003 ◽  
Vol 118 (4) ◽  
pp. 605-612 ◽  
Author(s):  
Jan Kolář ◽  
Carl Hirschie Johnson ◽  
Ivana Macháčková
Keyword(s):  
Chenopodium Rubrum ◽  
Short Day

Conditioning circadian rhythmic control of betacyanin content in Chenopodium rubrum by temperature and light intensity cycles during germination

1971 ◽  
Vol 49 (11) ◽  
pp. 1981-1985 ◽  
Author(s):  
Edgar Wagner ◽  
Silvia Frosch
Keyword(s):  
Circadian Rhythm ◽  
Light Intensity ◽  
Metabolic Activity ◽  
Time Course ◽  
Chenopodium Rubrum ◽  
Light Conditions ◽  
Dark Light ◽  
Cyclic Temperature ◽  
Free Running ◽  
Specific Phase

Evidence is presented that a circadian rhythm in betacyanin accumulation in Chenopodium rubrum seedlings (ecotype 50°10′ N, 105°35′ W, selection 184) was initiated or synchronized by the cyclic temperature and light conditions that were imposed during germination. This rhythm was probably free-running in the constant light conditions that preceded the imposition of darkness. Rhythmic fluctuations in the time course of betacyanin content during darkness, which are probably due to betacyanin turnover, showed correlations with the alternating germination conditions, thus indicating that the rhythm is not initiated or rephased by the transition from light of 600 or 3000 ft-c to darkness. Light following darkness increased the respective level of betacyanin accumulation but did not alter the phasing of the rhythm as compared with darkness. The metabolic activity of the seedlings in the light, following darkness, depends on the specific phase of the endogenous rhythm at the time of the dark: light transition.

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