Photoperiodism in Plants

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

doi:10.1126/science.132.3435.1223

Cited by 133 publications

(50 citation statements)

References 11 publications

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“…These considerations point to the conclusion that the spectral region in wNhich P, absorbs is sufficiently wvide to include part of the region in wlhich our FR filters transmit (fig 1, table IV), and that in adclition the equilibriunm state favors Pfr. The phytochromiie in the dark germinators is in the Pfr formii (2,14). During the early hours of incubation, relatively little Pr hlas been activatedl in the light requirers.…”

Section: Discussionmentioning

confidence: 99%

“…Presumably, the balance of the phytochronme remains in the promotive Pfr [The symbols Pfr and Pr represent the 2 forms of phytochrome, according to the accepted terminology (2,14).] form w!hen the white light is extinguished.…”

Section: Discussionmentioning

confidence: 99%

“…In view of the widespread occurrence of the phytochrome pigment system in seeds (2,14), it was decided to determine whether this pigment system was involved in this dual action of white light. The involvement of blue light in this phenomenon was also tested, since it is known to be active in the photocontrol of germination (4, 10).…”

mentioning

confidence: 99%

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Dual Action of White Light in the Photocontrol of Germination of Oryzopsis miliacea

Negbi

Koller

1964

Plant Physiol.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Dual Action of White Light in the Photocontrol of Germination of Oryzopsis miliacea

Negbi

Koller

1964

Plant Physiol.

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“…The interconvertibility of these two spectrally distinct forms functions as a biological switch operated by red or far red light for many light responses in plants. Phytochromes in the Pfr form have long been considered as the biologically active form (Borthwick and Hendricks, 1960).…”

Section: Introductionmentioning

confidence: 99%

Photomorphogenic development of the Arabidopsisshy2–1D mutation and its interaction with phytochromes in darkness

et al. 1998

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SummaryWe previously reported a photomorphogenic mutation of Arabidopsis thaliana, shy2-1D, as a dominant suppressor of a hy2 mutation. Here, we report that shy2-1D confers various photo-responsive phenotypes in darkness and the dark phenotypes of the mutant are affected by phytochrome deficiency. Dark-grown seedlings of the mutant developed several photomorphogenic characteristics such as short hypocotyls, cotyledon expansion and opening, and partial differentiation of plastids. When grown further in darkness, the mutant plant underwent most of the developmental stages of a light-grown wild-type plant, including development of foliar leaves, an inflorescence stem with cauline leaves, and floral organs. In addition, two light-inducible genes, the nuclear-encoded CAB and the plastid-encoded PSBA genes, were highly expressed in the dark-grown mutant seedlings. Furthermore, reduced gravitropism, a phytochrome-modulated response, was observed in the mutant hypocotyl in darkness. Thus, shy2-1D is one of the most pleiotropic photomorphogenic mutations identified so far. The results indicate that SHY2 may be a key component regulating photomorphogenesis in Arabidopsis. Surprisingly, double mutants of the shy2-1D mutant with the phytochrome-deficient mutants hy2, hy3 (phyB-1) and fre1-1 (phyA-201) showed reduced photomorphogenic response in darkness with a longer hypocotyl, a longer inflorescence stem, and a lower level expression of the CAB gene than the shy2-1D single mutant. These results showed that phytochromes function in darkness in the shy2-1D mutant background. The implications of these results are discussed.

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“…The effect of this red light interruption is reversed by succeeding exposure to far-red light (735 mu) (2,4). The pigment involved in these changes has been obtained in a partially purified state and is called phytochrome.…”

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confidence: 99%

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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Photoperiodism in Plants

Cited by 133 publications

References 11 publications

Dual Action of White Light in the Photocontrol of Germination of Oryzopsis miliacea

Dual Action of White Light in the Photocontrol of Germination of Oryzopsis miliacea

Photomorphogenic development of the Arabidopsisshy2–1D mutation and its interaction with phytochromes in darkness

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

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