Dormancy in Dioscorea: Generality of gibberellin-induced dormancy in asexual dormant organs

Okagami, Nobuo; Tanno, Noriaki

doi:10.1093/oxfordjournals.pcp.a075436

Cited by 18 publications

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“…3 and 4). In the previous reports, existence of two counteractive reactions (sprouting-inhibiting and sprouting-promoting) which are both activated by GA3 was assumed in bulbils of Begonia evansiana (6) and some species in the genus Dioscorea (10). In the present study, similar to the case of bulbils, existence of two counteractive reactions is observed in clearly separated states in the seed germination of D. tokoro (Figs.…”

Section: Discussionsupporting

confidence: 80%

“…4). These concentration effects of GA3 are explainable by a difference of GA3 concentration dependency of activity of the two counteractive reactions, similar to the assumption in bulbils of some species in the genus Dioscorea (10). That is to say, the germination-inhibiting reaction was markedly activated even by diluted GA3 (0.3 and 3 ,UM), but the higher concentrations (30 and 300 ,UM) of GA3 strongly activated the germination-inducing reaction.…”

Section: Discussionsupporting

confidence: 74%

“…However, in bulbils of Begonia evansiana (2,(4)(5)(6)(7)9) and also bulbils and subterranean dormant organs of some species in the genus Dioscorea (8,10), dormancy is induced by endogenous and exogenous gibberellin. Sprouting in winter buds of some woody plants is also retarded by applied gibberellin (1,12).…”

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Dormancy in Dioscorea

Okagami

Kawai²

1977

Plant Physiol.

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Effects of Light and gibberellic acid (GA3) application on the germination of Dioscorea tokoro Makino and Dioscorea tenuipes Franch. et Savat. were observed. For complete germination, seeds of both species required prechilling in moist condition before incubation at a higher temperture. Red Ught irradiation during the incubation after the prechilling promoted germination; blue, green, or far red light markedly inhibited the germination of both species.Application of GA3 induced complicated changes in the germination of both species in relation to light quality. In the germination of D. tokoro, GA3 inhibited in the dark and red; however, i promoted germination in blue and far red light. GA3 promoted germination of D. tenuipes in the dark and in blue, green, or far red lght. These phenomena are explainable by assuming two counteractive reactions (germination-promoting and germination-inhibiting) which are both activated by applied GA3.Gibberellin is well known to break dormancy of seeds and buds in many plants (3,11). However, in bulbils of Begonia evansiana (2,(4)(5)(6)(7)9) and also bulbils and subterranean dormant organs of some species in the genus Dioscorea (8, 10), dormancy is induced by endogenous and exogenous gibberellin. Sprouting in winter buds of some woody plants is also retarded by applied gibberellin (1, 12). In seeds, however, no information about the germination-inhibiting effect of gibberellin seems to have been published.We have studied comparative physiology in dormancy of seeds and buds of many species of the genus Dioscorea, perennial monocotyledonous herbaceous plants, which range from the tropics to the cold temperate zones. In the present paper, we tested light and temperature effect on germination and GA3-induced germination inhibition in seeds of Dioscorea tokoro and Prefecture) of Japan, dried at room temperature, and then stored in a desiccator containing silica gel until used. In germination experiments, 40 to 70 seeds were placed in a 9-cm Petri dish on a thin layer of absorbent cotton moistened with distilled H20 or aqueous solutions of GA3 (gift from Kyowa Fermentation Industries, Tokyo) and allowed to stand under various light conditions at 25 or 26 C in D. tokoro and 20 C in D. tenuipes. In some experiments, prior to incubation at the above conditions, the seeds were placed under 5 C in the dark in a Petri dish on a thin layer of absorbent cotton moistened with distilled H20 (prechilling).White light of 1,500 lux was obtained from real daylight (40-D-SDL, Toshiba, Tokyo) fluorescent lamps. Blue, green, and red light were obtained by filtering the radiations from colored fluorescent lamps (FL-20BF, FL-20GF, and FL-20RF, respectively, Mitsubishi, Tokyo) through a 1-mm thickness of blue, green, and red vinyl resin plates, respectively. For far red irradiation, light from medical IR incandescent lamps (Toshiba) was filtered through 10-cm of distilled H20 and a 1-mm thickness of red and blue vinyl resin plates. Approximate wavelength of peak and half-bandwidth of colored light...

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Section: Discussionsupporting

confidence: 80%

Section: Discussionsupporting

confidence: 74%

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Dormancy in Dioscorea

Okagami

Kawai²

1977

Plant Physiol.

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“…In many plants, exogenous gibberellin induces dormancy breaking and enhances seed germination and tuber sprouting (Okagami and Nagao, 1973;Okagami and Tanno, 1977). By contrast, in some plants gibberellins also induces dormancy.…”

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Endogenous Gibberellins in Bulbils of Chinese Yam during Growth and Storage

Kim

Shon

Park

et al. 2005

Plant Production Science

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“…Of these Chinese yams variety Nagaimo, Ichoimo and Tsukuneimo, only two varieties, Nagaimo and Ichoimo, are able to produce high amounts of bulbils and tubers under natural conditions. Otherwise, the variety 'Tsukuneimo' has been shown to have a lowest bulbil production among the yam varieties (Okagami and Tanno, 1977). For this reason, we founded new cultural technologies that foliar spray of mepiquat chloride at high concentration induces the enlargement of bulbils under field conditions (Kim et al, 2005).…”

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Effect of Proton Beam Radiation on Bulbil Yield and Gibberellins of Chinese Yam (Dioscorea opposita Thunb.)

Kim¹,

Choi²,

Kim³

et al. 2011

Korean Journal of Crop Science

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The study was carried out to evaluate the effect of proton beam radiation on production of bulbil and tuber including change of endogenous gibberellins, of Dioscorea opposita Thunb. The yield of bulbils and tubers from non-and irradiated D. opposita Thunb at doses of 5, 10, 15 and 20 Gy were determined. Endogenous gibberellins were also quantified by GC/MS analysis. D. opposita tubers irradiated at 15 Gy produced higher bulbil production than non-irradiated plants. Enlarged bulbil (above size diameter 4 mm) was significantly increased at 15 Gy. Bioactive endogenous GA 4 was dominant in bulbils and tubers irradiated with proton beam rather than GA 1 . Major gibberellins biosynthetic pathways in bulbils and tubers of D. opposita plants were non C-13 hydroxylation route. From the results of this study, 15 Gy proton beam radiation was suggested as an optimal dose that can produce high amounts of bulbil for mass production of D. opposita plant.

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Dormancy in Dioscorea: Generality of gibberellin-induced dormancy in asexual dormant organs

Cited by 18 publications

References 0 publications

Dormancy in Dioscorea

Dormancy in Dioscorea

Endogenous Gibberellins in Bulbils of Chinese Yam during Growth and Storage

Effect of Proton Beam Radiation on Bulbil Yield and Gibberellins of Chinese Yam (Dioscorea opposita Thunb.)

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