Photoperiodic Sensitivity with Respect to Metabolic Patterns of Cotyledons in Pharbitis nil
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چکیده
منابع مشابه
Changes in catecholamine levels in short day-induced cotyledons of Pharbitis nil.
We investigated the effects of catecholamine on flower-induction in P. nil (cv. Violet). GC-SIM analysis identified dopamine for the first time in P. nil seedlings. Dopamine levels in the cotyledons did not show a significant change during the inducing dark treatment. The dopamine content of cotyledons exposed to various durations of darkness were 0.1-0.2 nmol/g fresh weight. The same content w...
متن کاملEffect of Temperature and Preconditioning on Photoperiodic Response of Pharbitis nil.
In both short-day and long-day plants, endogenous rhythms apparently are involved in photoperiodic response. One line of the evidence is a rhythmic flowering response to cycle length (1, 3,4, 6,9), and another is the rhythmic effectiveness of light breaks given at different points in very long dark periods (2, 4,6,8, 10). Phlarbitis nil, strain Violet, is an extremely sensitive short-day plant....
متن کاملEffect of Photoperiodic Floral Induction on the Metabolism of a Gibberellin Precursor, (-)-Kaurene, in Pharbitis nil.
Pharbitis nil seedlings rapidly metabolized (-)-kaurene-17-(14)C administered to the cotyledons. Less than 20% of the radioactivity was recovered by extraction of the cotyledons on the following day. Of this the major metabolite was an unidentified acidic material which did not correspond chromatographically to any of the known gibberellins.Significant differences were observed between the radi...
متن کاملStudies on Red Light Interruption in Relation to Timing Mechanisms Involved in the Photoperiodic Response of Pharbitis nil.
In a previous paper (2) it has been suggested that at least 3 kinds of timingimechanisms are involved in the photoperiodic response of Phlar-bitis nil. The first timing component is similar to an hourglass in that a linear increase in the flowering response results with increasing duration of the dark period. This component is very sensitive to temperature. The second component is an endogenous...
متن کاملEffect of Far-Red Light and its Interaction with Red Light in the Photoperiodic Response of Pharbitis nil.
Red light given in the inductive dark period inhibits flowering in short day plants, and this effect may be reversed by far-red light given shortly after the red irradiation. The pigment system involved in these reactions is called phytochrome. In Pharbitis, however, the flower-inhibitory effect of red light is not reversed by succeeding irradiation with far-red (6, 7, 8, 13). The flowering res...
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ژورنال
عنوان ژورنال: Shokubutsugaku Zasshi
سال: 1963
ISSN: 0006-808X
DOI: 10.15281/jplantres1887.76.142