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Journal Article 2006

Iron toxicity symptoms in yams (Dioscorea spp.) grown in water culture

Autor: Shiwachi, H. Kikuno, H. Okonkwo, C.C. Asiedu, Robert

Growth of varieties of Dioscorea alata and D. rotundata were stunted when they were grown in nutrient solutions containing 5 to 60 mg l−1 Fe. In D. alata variety TDa 95/00361, plants grown in 60 mg l−1 Fe solution exhibited reductions of 29–65% in plant height, leaf length and width, number of le...

Enlace original: https://cgspace.cgiar.org/handle/10568/91411

Investigación en Agricultura

DIOSCOREA

IRON TOXICITY

WATER CULTURE

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Shiwachi, H. , Kikuno, H. , Okonkwo, C.C. , Asiedu, Robert , [Iron toxicity symptoms in yams (Dioscorea spp.) grown in water culture] , Iron toxicity symptoms in yams (Dioscorea spp.) grown in water culture

Journal Article 2006

Interaction among cultural factors in microtuberization of white yam (Dioscorea rotundata)

Autor: Balogun, M. Fawole, I. Ng, S.Y.C. Ng, N.Q. Shiwachi, H. Kikuno, H.

Single node cuttings from pathogen-tested in vitro plantlets of white guinea yam (D. rotundata), cultivar TDr 93–23, were cultured in tuberization and half- and full-strength Murashige and Skoog media with 5% or 8% sucrose, with or without agar, in light or darkness and at 25 or 18°C. Microtuberi...

Enlace original: https://cgspace.cgiar.org/handle/10568/91374

Investigación en Agricultura

YAMS

MICROTUBERIZATION

CULTURE MEDIUM

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Balogun, M. , Fawole, I. , Ng, S.Y.C. , Ng, N.Q. , Shiwachi, H. , Kikuno, H. , [Interaction among cultural factors in microtuberization of white yam (Dioscorea rotundata)] , Interaction among cultural factors in microtuberization of white yam (Dioscorea rotundata)

Report 2003

Possibility of earlyseason culture of water yam (Dioscorea alata L.) in Yaku island

Autor: Onjo, M. Shiwachi, H. Hayashi, M.

Early-season culture of water yam was required in Yaku Island, because of the long growing period, the concentrating work at the harvesting time, the lack of storehouse and so on. Thus we tried to search the early-maturing strains and use a plant growth regulator that promote the tuber enlargemen...

Enlace original: https://cgspace.cgiar.org/handle/10568/97980

Investigación en Agricultura

GIBBERELLINS

WATER YAM

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Onjo, M. , Shiwachi, H. , Hayashi, M. , [Possibility of earlyseason culture of water yam (Dioscorea alata L.) in Yaku island] , Possibility of earlyseason culture of water yam (Dioscorea alata L.) in Yaku island

Journal Article 2003

Induction of germination in dormant yam (Dioscorea spp.) tubers with inhibitors of gibberellins

Autor: Shiwachi, H. Ayankanmi, T.G. Asiedu, Robert Onjo, M.

A reliable means to induce sprouting in dormant seed tubers of yams (Dioscorea species) is required to enhance flexibility in planting date and rate of propagation of the crop. Experiments were conducted to assess the potential of two gibberellin inhibitors, Uniconazole-P and Prohexadione-calcium...

Enlace original: https://cgspace.cgiar.org/handle/10568/98051

Investigación en Agricultura

YAMS

SPROUTING

GIBBERELLINS

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Shiwachi, H. , Ayankanmi, T.G. , Asiedu, Robert , Onjo, M. , [Induction of germination in dormant yam (Dioscorea spp.) tubers with inhibitors of gibberellins] , Induction of germination in dormant yam (Dioscorea spp.) tubers with inhibitors of gibberellins

Journal Article 2007

Production of minitubers from vine cuttings of white yam (Dioscorea rotundata)

Autor: Oyetunji, O.J. Kabeya, M. Shiwachi, H.

The multiplication ratio for seed yam production is very low compared to other tuberous crops. Seven clones of Dioscorea rotundata Poir (white yam) were evaluated for production of mini tubers from their vine cuttings. Three to four nodes leafy vine cuttings were prepared from the middle portion ...

Enlace original: https://cgspace.cgiar.org/handle/10568/91459

Investigación en Agricultura

D. ALATA

D. ROTUNDATA POIR

CULTIVARS

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Oyetunji, O.J. , Kabeya, M. , Shiwachi, H. , [Production of minitubers from vine cuttings of white yam (Dioscorea rotundata)] , Production of minitubers from vine cuttings of white yam (Dioscorea rotundata)

Journal Article 2003

Relationship between dormancy and its release and external factors in tubers of water yam (Dioscorea alata L.)

Autor: Park, B.J. Onjo, M. Tominaga, S. Shiwachi, H. Hayashi, M.

To analyze the mechanism of dormancy in tubers of water yam (Dioscorea alata L.), we studied the relationship between external factors and dormancy and its release in tubers. Several strains of water yam that have been introduced into Japan from Southeast Asia and Oceania were grown in Kagoshima,...

Enlace original: https://cgspace.cgiar.org/handle/10568/97988

Investigación en Agricultura

DORMANCY

SPROUTING

TEMPERATURE

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Park, B.J. , Onjo, M. , Tominaga, S. , Shiwachi, H. , Hayashi, M. , [Relationship between dormancy and its release and external factors in tubers of water yam (Dioscorea alata L.)] , Relationship between dormancy and its release and external factors in tubers of water yam (Dioscorea alata L.)

Report 2003

Distinction of mixed yam strains (Dioscorea alata L.) cultivated in Yaku Island

Autor: Onjo, M. Matsuo, T. Hakariya, S. Shiwachi, H. Hayashi, M.

This study clarified we could effectively distinguish mixed water yam strains by observing the differences of morphology of the leaves and tubers in Yaku Island. However, there are considerable variations in morphology, so we may be able to more confidently distinguish strains by also employing t...

Enlace original: https://cgspace.cgiar.org/handle/10568/97982

Investigación en Agricultura

WATER YAM

POLYACRYLAMIDE

GEL ELECTROPHORESIS

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Onjo, M. , Matsuo, T. , Hakariya, S. , Shiwachi, H. , Hayashi, M. , [Distinction of mixed yam strains (Dioscorea alata L.) cultivated in Yaku Island] , Distinction of mixed yam strains (Dioscorea alata L.) cultivated in Yaku Island

Journal Article 2007

Effect of sucrose treatment on root, shoot and tuber formation of vine cuttings of yams (Dioscorea spp.)

Autor: Kikuno, H. Matsumoto, R. Shiwachi, H. Asiedu, Robert

Enlace original: https://cgspace.cgiar.org/handle/10568/93014

Investigación en Agricultura

SUCROSE

PLANTLETS

CUTTING

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Kikuno, H. , Matsumoto, R. , Shiwachi, H. , Asiedu, Robert , [Effect of sucrose treatment on root, shoot and tuber formation of vine cuttings of yams (Dioscorea spp.)] , Effect of sucrose treatment on root, shoot and tuber formation of vine cuttings of yams (Dioscorea spp.)

Journal Article 2007

Comparative effects of explants sources and age of plant on rooting, shooting and tuber formation of vine cuttings of yams (Dioscorea spp.)

Autor: Kikuno, H. Matsumoto, R. Shiwachi, H. Toyohara, H. Asiedu, Robert

Enlace original: https://cgspace.cgiar.org/handle/10568/93023

Investigación en Agricultura

YAMS

DIOSCOREA

PROPAGATION

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Kikuno, H. , Matsumoto, R. , Shiwachi, H. , Toyohara, H. , Asiedu, Robert , [Comparative effects of explants sources and age of plant on rooting, shooting and tuber formation of vine cuttings of yams (Dioscorea spp.)] , Comparative effects of explants sources and age of plant on rooting, shooting and tuber formation of vine cuttings of yams (Dioscorea spp.)

Journal Article 2008

Enhancing offseason yam production in Nigeria

Autor: Shiwachi, H. Kikuno, H. Fashola, R. Asiedu, Robert

Yam cultivation in dry season was tested in the farmer’s field at inland valley in Niger state, Nigeria. Water yam (Dioscorea alata) variety TDa 95/00328 had the greater response to the gibberellin inhibitor prohexadione-calcium (PC). The sprouting period of PC treated tuber was 21 – 27 days at D...

Enlace original: https://cgspace.cgiar.org/handle/10568/90795

Investigación en Agricultura

DIOSCOREA ALATA

DORMANCY

GIBBERELLIN INHIBITORS

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Shiwachi, H. , Kikuno, H. , Fashola, R. , Asiedu, Robert , [Enhancing offseason yam production in Nigeria] , Enhancing offseason yam production in Nigeria

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