Failure of Photoreversible Control of Flowering in Pharbitis nil

Nakayama, Shidai; Borthwick, H. A.; Hendricks, S. B.

doi:10.1086/336077

Cited by 53 publications

(16 citation statements)

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“…The "null" experiments in which mixtures of R and FR are sought that have no effect (e.g., 8) provide some support for this idea. Furthermore, light quality just before dark strongly influences flowering in Pharbitis nil (R promoting and FR inhibiting; 14,17) and in Wintex barley (FR promoting; 6). Actually, Figure 8 shows that nearly pure FR is perceived as darkness.…”

Section: Discussionmentioning

confidence: 96%

Twilight Effect: Initiating Dark Measurement in Photoperiodism of Xanthium

Salisbury

1981

Plant Physiol.

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Six experiments studied the effects of low levels of red and far-red light upon the initiation of measurement of the dark period in the photoperiodic induction of flowering in Xanthium stunarium L. (cocklebur), a short-day plant, and compared effects with those of comparable light treatments applied for 2 hours during the middle of a 16-hour inductive dark period. Red Ught, or red plus far-red, at levels that inhibit flowering when applied during the middle of the inductive dark period, either had no effect on the initiation of dark measurement (ie., were perceived as darkness), or they delayed the initiation of dark measurement by various times up to the full interval of exposure (2 hours). Far-red Ught alone had virtually no effect either at the bnning or in the middle of the dark period. These results confirm that time measurement in the photoperiodic response of short-day Xanthium plants is not simply the time required for metabolic dark conversion of phytochrome. Results also suggest that the pigment system

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Section: Discussionmentioning

confidence: 96%

Twilight Effect: Initiating Dark Measurement in Photoperiodism of Xanthium

Salisbury

1981

Plant Physiol.

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“…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%

“…48-hr) (lark period (19). The (16). In Chenopodiumiii (6), Glycin.e (3,18), and Kalanchoe (8), far-red also inhibits during long dark periods.…”

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confidence: 99%

“…Although inhibition by far-red light has been attributed to a number of factors, 1 factor in common in most instances is the involvement of a relatively long dark period. Some investigators have explained the inhibition of flowering of short-day plants and the dual response to far-red light as due to the action of far-red light on phytochrome (6,12,16) while others have proposed that a second pigment is also involved (9,13,20). There is instufficient information to decide if either theory is correct.…”

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confidence: 99%

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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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“…bitis, however, the flower-inhibitory effect of red light is not reversed by succeeding irradiation with far-red (6,7,8,13). The flowering response of Pharbitis is inhibited by far-red light given at the beginning of the dark period, and this inhibitory effect is completelv reversed by red light applied shortly after the far-red irradiation (6,7).…”

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confidence: 99%