Effect of Far-Red Light and its Interaction with Red Light in the Photoperiodic Response of <i>Pharbitis nil</i>

Takimoto, Atsushi; Hamner, K. C.

doi:10.1104/pp.40.5.859

Cited by 31 publications

(14 citation statements)

References 8 publications

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“…tive wheni both were giveni in that order (red followed by far-red) or simultaneously (10). These results can not be understood with the present general concept of the physiological action of the phytochrome svstem.…”

contrasting

confidence: 42%

“…to red is 2 miniutes to 2 hours. In a previous paper (10) it was suggested that far-red light exerts some effect which inhibits the following dark process. It is highly probable that far-red light applied after a red interruption exerts somle effect which inhibits the flower-promoting effect of the red light, which is shown by curve b in figure 6.…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, the flower-inhibitory effect of far-red light is reversed by subsequent irradiation with red light (10). Both red and far-red irradiations are inhibitory to flowering at the 8-hour poinlt of the dark period, and these effects are almost addi-1 Received February 17, 1965.…”

mentioning

confidence: 96%

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Kinetic Studies on Pigment Systems Concerned with the Photoperiodic Response in Pharbitis nil

Takimoto

Hamner

1965

Plant Physiol.

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In maniy short-day and long-day plants the action spectrum for inhibition or promotion of flowering by a light interruption of the dark period shows a peak in the red (660 m,u In Pharbitis (10) the flower-inhibiting effect of a red light interruption is not reversed by subsequent irradiation with far-red, but far-red light given after a red light interruption intensifies the inhibitory effect. On the other hand, the flower-inhibitory effect of far-red light is reversed by subsequent irradiation with red light (10). Both red and far-red irradiations are inhibitory to flowering at the 8-hour poinlt of the dark period, and these effects are almost addi-

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contrasting

confidence: 42%

Section: Discussionmentioning

confidence: 99%

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Kinetic Studies on Pigment Systems Concerned with the Photoperiodic Response in Pharbitis nil

Takimoto

Hamner

1965

Plant Physiol.

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“…In Pharbitis nil, far-red light interruptions are inhibitory if given dturing the first part of a long (e.g. 48-hr) (lark period (19). The (16).…”

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confidence: 99%

“…However, far-red light has ibeen shown to inhibit flowering in a number of short-day plants including Xanthiiuni pensylvanictum (1,10), Glycine mttax (3,18), Chenopodiumii rubrumi-(5, 6), Lemiina perpusilla (17), Chrysanthentiuni sp. (4), Kalanchoe blossfeldiana (8,11), and most extensively Pharbitis nil ( 15, 16,19,20).…”

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confidence: 99%

Control of Flowering of Xanthium pensylvanicum by Red and Far-red Light

1967

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Approximately the same energy of red light was required to overcome the inhibitory effect of far-red at the second hour of darkness as was required to produce maximum red light inhibition at the eighth hour. Although far-red light was most inhibitory when given early in a long dark period, approximately the same energy of far-red light was required to saturate the far-red response at the fourth, eighth and sixteenth hours.The results are discussed in relation to other reports of far-red inhibition of flowering in short-day plants.It seems clear that the pigment phytochrome is involved somehow in the photoperiodic response.

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Leaf Initiation Correlates With Time of Maximal Sensitivity of the SDP Xanthium (Asteraceae) to Dark Interruption

Jacobs

1992

American J of Botany

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The hypothesis was tested that the well‐known maximal sensitivity to a light break at or near the middle of the dark period of short‐day plant Xanthium is correlated with a specific stage of leaf initiation. Samples were collected at various hours before and during noninductive 6‐hr dark periods. Lengths of leaf primordia were calculated from serial transverse sections. The reproducible results confirmed that leaf initiation occurred at or near middark under the 18:6 hr light: dark growing conditions. The author suggests the working hypothesis that for a light break to be effective in nullifying the effect of a “long” night in photoperiodically sensitive plants, the light must react with a specific early stage of leaf initiation.

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Effect of Far-Red Light and its Interaction with Red Light in the Photoperiodic Response of Pharbitis nil

Cited by 31 publications

References 8 publications

Kinetic Studies on Pigment Systems Concerned with the Photoperiodic Response in Pharbitis nil

Kinetic Studies on Pigment Systems Concerned with the Photoperiodic Response in Pharbitis nil

Control of Flowering of Xanthium pensylvanicum by Red and Far-red Light

Leaf Initiation Correlates With Time of Maximal Sensitivity of the SDP Xanthium (Asteraceae) to Dark Interruption

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