Results 161 to 170 of about 1,560 (197)

Carotenoid pigments of Dioscorea cayenensis

Annals of Applied Biology, 1975
SUMMARYThe yellow flesh of Dioscorea cayenensis, a principal yam of Africa, was found to contain xanthophyll esters as the principal pigments. These included neoxanthin, violaxanthin and auroxanthin. In addition β‐carotene, or pro‐vitamin A was found in small quantities. Measurements show that D. cayenensis is a fair source of this nutrient.
F. W. MARTIN, RUTH RUBERTÉ
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Studies on the relationship of Dioscorea cayenensis and Dioscorea rotundata cultivars

Euphytica, 1986
Two numerical taxonomic techniques, single linkage cluster analysis (SLCA) and principal components analysis (PCA) were used to study the relationship between Dioscorea cayenensis and D. rotundata cultivars. The study was prompted by the confusion in the taxonomy of the two taxa. Twenty-two cultivars (14 of D. rotundata and 8 of D.
J. C. Onyilagha, J. Lowe
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Axillary proliferation and tuberisation of Dioscorea cayenensis–D. rotundata complex

Plant Cell, Tissue and Organ Culture, 2007
Yams (Dioscorea spp) are tuber crops used as staple food in Africa because of their nutritional value. However agronomic constraints, phytosanitary problems and the lack of good healthy planting material restrict their production. In contrast to the inefficiency of traditional method of planting, tissue culture techniques allow to increase the ...
Ovono, Paul O, Kevers, Claire, Dommes, Jacques   +2 more
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Tuber formation and development of Dioscorea cayenensis–Dioscorea rotundata complex in vitro effect of polyamines

In Vitro Cellular & Developmental Biology - Plant, 2009
Tuberisation was obtained in vitro on yam (Dioscorea cayenensis–Dioscorea rotundata complex). The effect of exogenous polyamines on tuber formation and development (length and weight of microtubers) was investigated and discussed in relation with changes in endogenous polyamines.
Ondo Ovono, Paul, Kevers, Claire, Dommes, Jacques   +2 more
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Purification and physicochemical properties of starch phosphorylase from yam (Dioscorea cayenensis)

Plant Science, 1991
Abstract Cytoplasmic starch phosphorylase from yam ( Dioscorea cayenensis ) was partially purified by ammonium sulfate fractionation. chromatography on DEAE A-50, Sephadex G-100 and Sepharose 6B filtration. Only one band showing phosphorylasic activity was found upon polyacrylamide gel electrophoresis. Its apparent molecular weight was 200 000 ± 3000.
Ilphate Hamdan, Jacques Diopoh
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Physical and chemical changes in traditionally stored yam tubers (Dioscorea rotundata Poir and Dioscorea cayenensis Lam)

Journal of Agricultural and Food Chemistry, 1988
Les modifications qui interviennent en debut d'entreposage vont dans le sens d'une amelioration de la qualite globale. Au-dela de 120 jours, les pertes en elements nutritifs, les phenomenes de germination et les pourritures rendent l'entreposage nefaste, y compris du point de vue des proprietes ...
Oladipo Onayemi, Adedayo Idowu
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Purification and physicochemical properties of an acid phosphatase from Dioscorea cayenensis cytoplasm

Plant Science Letters, 1982
Abstract An acid phosphatase from yam tuber cytoplasm has been purified by ammonium sulfate fractionation, ion exchange chromatography through CM-Sephadex A-50 and gel filtration through Sephadex G-200. The preparation was homogeneous by polyacrylamide gel electrophoresis and has an apparent molecular weight of 98 000 ± 2000.
A. Kamenan, J. Diopoh
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Domestication of Yams (Dioscorea Cayenensis-Rotundata) within the Bariba Ethnic Group in Benin

Outlook on Agriculture, 2000
The domestication of yams ( Dioscorea cayenensis-rotundata) is still an active process in west Africa, but so far no specific research has been conducted to collect the knowledge held by traditional societies in which the yam is an important part of civilization.
Dumont, Roland, Vernier, Philippe
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In vitro induction of minitubers in yam (Dioscorea cayenensis- D. rotundata complex)

Plant Cell, Tissue and Organ Culture (PCTOC), 2011
Two methods were used to produce yam minitubers from two different yam cultivars (cv. Krengle and cv. Kponan) using in vitro culture techniques. Method 1: Yam microtubers were first initiated in vitro and then transplanted to soil to generate plants from which minitubers were produced.
Kouadio A. Olivier, Koffi N. Konan, Felicia N. Anike, Georges N. Agbo, Hortense W. Dodo   +4 more
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The classification of the cultivated yams (Dioscorea cayenensis-rotundata complex) of West Africa

Euphytica, 1990
Using morphological descriptors and starch gel electrophoresis, 393 west African cultivated yam accessions (D. cayenensis-rotundata complex), and representatives of twenty varietal groups previously described, were studied.
Perla Hamon, Bakary Touré
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