Dual Action of White Light in the Photocontrol of Germination of <i>Oryzopsis miliacea</i>

Negbi, M.; Koller, D.

doi:10.1104/pp.39.2.247

Cited by 35 publications

(15 citation statements)

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“…1). This phenomenon has also been observed by other authors (13,22,23) and may be due to synthesis of phytochrome (24,29) or of a substance (X) required at some stage of the transduction chain between phototransformation of phytochrome and the expression of its effect in germination (20,27). The progressive disappearance of a germination inhibitor (3) could also be involved.…”

Section: Methodssupporting

confidence: 48%

Effect of Temperature, Oxygen, and Gibberellic Acid on the Development of Photosensitivity in Oldenlandia corymbosa L. Seeds during Their Incubation in Darkness

Corbineau¹,

Côme²

1985

Plant Physiol.

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Two successive phases can be distinguished in the development of the responsiveness to light in Oldenlandia corymbosa L. seeds during their incubation in darkness. During phase I, the responsiveness to light increases with time if there is sufficient 02, and the higher the temperature, the faster the increase. This phase is stimulated by gibberellic acid. During the following phase (II), seeds remain responsive to light at 10 or 20°C, but lose their responsiveness at higher temperature (-30°C). This second phase depends on 2: loss of responsiveness is accelerated at lower 02 concentration. Phase II is only slightly affected by gibberellic acid. The results are discussed in terms of variation of phytochrome and of a reaction along the transduction chain initiated by phototransformation of this pigment, which is finally expressed in germination.The main characteristics of germination of Oldenlandia corymbosa L. seeds (tropical Rubiaceae) have been described in previous studies (2,6,7,9 Phytochrome is involved in the photosensitivity of 0. corymbosa seeds, but long exposures to white or red light are necessary to ensure germination (9, 10). Moreover, the action of light depends on temperature conditions of the preceding dark incubation (9, 10). The absolute requirement for light is lost in the presence of GA3 at sufficiently high concentrations (above 0.1 mM) (8).The purpose of the present study is to determine the effect of temperature, 02, and GA3 on the development of the responsiveness to light in these seeds during incubation in the dark. MATERIALS AND METHODSThe present study was carried out with O2-insensitive seeds, harvested from plants selected to produce only this type of seed (2). These plants were grown in the Phytotron at Gif-sur-Yvette (France) under conditions defined previously (6). Each germination experiment consisted of three replicates (Petri dishes), each containing 100 to 200 seeds placed on filter paper over a layer of cotton wool imbibed with deionized H20, or with GA3 (Fluka Chemical Co.) solutions at different concentrations. The results were expressed as mean values ± SE. Each experiment was repeated 2 to 3 times with different batches of seeds. Since the results of the repeated experiments were qualitatively the same, but differed somewhat quantitatively, only representative experiments are reported. Treatments in different 02-rich atmospheres were applied using the device perfected by Come and Tissaoui (4). White light (13 ± 0.5 Wm2) was provided by two 16-W Mazdafluor fluorescent tubes (warm white).Experimental procedure was as follows. Seeds were first incubated in darkness for various times, on water or on GA3, in air or in various 02 concentrations and at different temperatures. Then, they were irradiated for 4 h at 35C in air. After irradiation, they were transferred in darkness, in air, at 37°C, and germination percentages were determined 7 d later. A seed was considered to have germinated when its radicle had pierced the seed coat. RESULTSInfluence of Temperature Before ...

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Section: Methodssupporting

confidence: 48%

Effect of Temperature, Oxygen, and Gibberellic Acid on the Development of Photosensitivity in Oldenlandia corymbosa L. Seeds during Their Incubation in Darkness

Corbineau¹,

Côme²

1985

Plant Physiol.

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“…2c, d, f). The dose dependent dual role of light on germination has also been reported in other plant species (Negbi and Koller 1964;Bartley and Frankland 1982;Arana et al 2007). Light and cold stratification promote seed germination through increase in endogenous GA levels by increasing GA 3 ox transcripts levels and GA sensitivity (Yamaguchi and Kamiya 2002;Yamauchi et al 2004) in Arabidopsis.…”

Section: Discussionsupporting

confidence: 55%

“…Light can both promote and inhibit seed germination of a species under different conditions e.g. Oryzopsis miliaceae, Sinapis arvensis and Datura ferox (Negbi and Koller 1964;Bartley and Frankland 1982;de Miguel et al 2000;Arana et al 2007). The dual roles of light in seed germination might be mediated by different types of phytochromes (Shinomura et al 1994(Shinomura et al , 1996Shichijo et al 2001;Arana et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Hormonal and environmental regulation of seed germination in salt cress (Thellungiella halophila)

Khan

Yamaguchi

et al. 2014

Plant Growth Regul

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Thellungiella halophila (salt cress) is a salt tolerant species with high genetic and morphological similarity to model plant Arabidopsis thaliana. The role of growth regulators in imposing seed dormancy and a release from it while responding to environmental signals has been examined. Seeds of salt cress possess a deep dormancy at maturity which decreased during after-ripening and cold stratification. After-ripened seeds of salt cress failed to germinate in dark and in strong light (134 lmol m -2 s -1 ) while best seed germination was obtained in weak white light (1-10 lmol m -2 s -1 ) at 22°C. The germination of non-dormant salt cress seeds was also regulated by red and far-red light. Light enhanced the sensitivity to gibberellin in dark-imbibed salt cress seeds and strong light inhibited biosynthesis of gibberellins. The endogenous abscisic acid was not affected by strong light implying that inhibition of seed germination is not mediated through ABA signals. Higher seed germination was recorded at a constant temperature of 20°C and a thermoperiod of 15/25°C (12 h strong light/12 h dark). Seeds of salt cress when exposed to 400 mM NaCl for 10 days maintain their viability however there was a heavy mortality among Arbidopsis seeds under similar conditions. Our data indicates that seed germination in salt cress is highly regulated by environmental and hormonal signals to provide opportunities to germinate under natural conditions.

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“…Exposure to intermittent FR radiation or to alterniate intermittent red (R) and FR radiatons wvere uised to demionstrate that the re.sponse to prolonged FR was actuallv a low energy-requiring. phytochro.nw controllled response (4) and not one dependinig oni the high energy reaction system (HER) as it hias been reported for other seeds (8).…”

mentioning

confidence: 75%

Phytochrome and Seed Germination. III. Action of Prolonged Far Red Irradiation on the Germination of Tomato and Cucumber Seeds

1967

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Summary. Proloniged irradiation with continuous or intermittent far red prevents the germination of tomato and cucumber seeds. The inhibitorv efficiency of intermittent far red decreases with the lengthening of the interval between successive irradiations, and with the increase of temperature. If each far red irradiation is followed by red, germination is restored. Intermittent far red is less inhibitory than intermittent red-far red xvhen red is given immediately before each far red. This effect is more evident when the interval between stuccessive irradiation becomes longer.Evidence has beeni presented in previou-s reports tllat the active form (PFR) of phytochronie (P) is one of the factors controlling the dark germination of lettuce (3) and tomato (4) seeds. It lhas been demonstrated that the germination response to prolonged far red (FR) irradiation in lettuce (3) and tomato (4), as 'well as the response to Sliort FR irradiation ;n toimato (4, 5) is phytochrome conltrolled. Exposure to intermittent FR radiation or to alterniate intermittent red (R) and FR radiatons wvere uised to demionstrate that the re.sponse to prolonged FR was actuallv a low energy-requiring. phytochro.nw controllled response (4) and not one dependinig oni the high energy reaction system (HER) as it hias been reported for other seeds (8).In this paper we present furtlher data oln the action of prolonged FR irrad'atioils oni the germination of tomato and cLucunmber s

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

Cited by 35 publications

References 7 publications

Effect of Temperature, Oxygen, and Gibberellic Acid on the Development of Photosensitivity in Oldenlandia corymbosa L. Seeds during Their Incubation in Darkness

Effect of Temperature, Oxygen, and Gibberellic Acid on the Development of Photosensitivity in Oldenlandia corymbosa L. Seeds during Their Incubation in Darkness

Hormonal and environmental regulation of seed germination in salt cress (Thellungiella halophila)

Phytochrome and Seed Germination. III. Action of Prolonged Far Red Irradiation on the Germination of Tomato and Cucumber Seeds

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