scholarly journals Development of mapping populations for genetic analysis in yams (Dioscorea rotundata Poir. and Dioscorea alata L.)

2011 ◽  
Vol 10 (16) ◽  
pp. 3040-3050 ◽  
Author(s):  
Sartie Alieu ◽  
Robert Asiedu
Keyword(s):  
Genetic Analysis ◽  
Dioscorea Alata ◽  
Dioscorea Rotundata ◽  
Mapping Populations

Serological Detection of Dioscorea alata potyvirus on White Yams (Dioscorea rotundata) in Ghana

2007 ◽  
Vol 2 (6) ◽  
pp. 630-634 ◽  
Author(s):  
A. Oppong ◽  
J.N.L. Lamptey ◽  
F.A. Ofori ◽  
F.O. Anno-Nyako ◽  
S.K. Offei ◽  
...  
Keyword(s):  
Dioscorea Alata ◽  
Serological Detection ◽  
Dioscorea Rotundata

Effect of pretreatment and temperature on air-drying of Dioscorea alata and Dioscorea rotundata slices

2007 ◽  
Vol 80 (4) ◽  
pp. 1002-1010 ◽  
Author(s):  
Kolawole O. Falade ◽  
Taiwo O. Olurin ◽  
Ebenezer A. Ike ◽  
Ogugua C. Aworh
Keyword(s):  
Dioscorea Alata ◽  
Dioscorea Rotundata ◽  
Air Drying

scholarly journals Reacción de genotipos de ñame (dioscorea spp) a la antracnosis (colletotrichum gloeosporioides)

2013 ◽  
Vol 18 (1) ◽  
pp. 34-40
Author(s):  
Yuli Mendez ◽  
Jorge Palencia ◽  
Karina Hernandez ◽  
Eduardo Hernandez ◽  
Javier Beltrán
Keyword(s):  
Colletotrichum Gloeosporioides ◽  
Dioscorea Alata ◽  
Dioscorea Rotundata ◽  
Dioscorea Cayenensis

El ñame (Dioscorea spp) es afectado por diferentes patógenos, entre los que se destaca Colletotrichum gloeosporioides, agente causal de la antracnosis. Esta enfermedad reduce la eficiencia fotosintética de la planta y ocasiona pérdidas en la producción de más del 90% en variedades susceptibles y disminución en la calidad de los tubérculos. El objetivo de este estudio fue evaluar la reacción de genotipos de ñame, en la colección de la Universidad de Sucre, a la antracnosis. Se realizaron inoculaciones con cuatro aislados de C. gloeosporioides en 19 accesiones, correspondientes a las especies Dioscorea alata (diez), Dioscorea rotundata (siete), Dioscorea cayenensis (una), y Dioscorea trífida (una); mediante aspersión de esporas en hojas de plantas in vitro. Se encontró diferencia altamente significativa en la reacción del germoplasma de ñame a la antracnosis (F= 80,37; gl= 18; p menor que 0,0000), sin embargo los aislados evaluados no mostraron diferencia significativa en su agresividad (F= 1,71; gl= 3; p menor que 0,1762). D. trifida presentó la mayor resistencia, seguida de D. cayenensis y D. rotundata; mientras que D. alata fue la especie más susceptible.

scholarly journals The Impact of Conservation Agriculture Practice and Socio-Economic Factors on Yam Production (Dioscorea alata and Dioscorea rotundata) in Kalagoé (Lobaye, Central African Republic)

2021 ◽  
pp. 121-131
Author(s):  
G. I. Touckia ◽  
L. Aba-Toumnou ◽  
O. D. Yongo ◽  
M. Ganima Yara ◽  
K. Kokou
Keyword(s):  
Management Practices ◽  
Conservation Agriculture ◽  
Potential Effect ◽  
Dioscorea Alata ◽  
Dioscorea Rotundata ◽  
Partial Cutting ◽  
Smallholder Farms ◽  
Large Trees ◽  
The Impact ◽  
Socio Economic Factors

Few studies have been carried out on Yam (Dioscorea alata and Dioscorea rotundata) in relation with the conservation agriculture in CAR. Yam is cultivated in limited quantities despite its role in improving food security.  In order to increase  Yam   production  in the smallholder farms in CAR, the potential effect   of  crop management practices  like    nutrient application,  mulching and minimum  tillage  on  Yam  crop  yield  and  household  financial  returns,  needs  to  be  understood. A  questionnaire  was  prepared  and  used  as  a  tool  for the  collection  of  information  from 100 producers  of Yam without distinction of ages and sexes. In order to determinate the agronomical performance of Yam, two plots were explored. The first plot with 625m² (12.5m ×50m), known as the improved plot, is a plot on which all conservation agriculture practices were applied. The second plot, known as the traditional plot, is one on which traditional farming techniques were applied. The results of the survey show that 32% of the farmers are in favor for CA practice nevertheless 68% are not favor, which shows that a large proportion of farmers in Kalangoé are not aware of the benefits of this technique. The most widely cultivated variety is D. rotundata, because of its taste qualities.  Some producers also grow both varieties at the same time. Some producers (28%) clear their plots by cutting down all the trees to leave the field bare, while a large number (72%) practice partial cutting by removing the shrubs to keep the large trees in order to protect the forest. A large number of producers (62%) also burn their plots for various reasons, including freeing up space and making it easier to move around the field because the plant debris from clearing prevents them from working properly. A small proportion of producers (26%) practice ploughing against 74% who do not practice this technique. The conservation agriculture practice applied to Yam gave interesting agronomic performances (growth and production parameters) than the farmers practices.

scholarly journals Characterization of the techno-functional properties of starch from Purple yam (Dioscorea alata), Hawthorn yam (Dioscorea rotundata) and Diamante 22-type yam

DYNA ◽  
2018 ◽  
Vol 85 (207) ◽  
pp. 143-152
Author(s):  
Rodrigo Daniel Salgado-Ordosgoitia ◽  
Jhonatan Andrés Rodríguez-Manrique ◽  
Carlos Segundo Cohen-Manrique ◽  
Gean Pablo Mendoza-Ortega
Keyword(s):  
Functional Properties ◽  
Water Solubility ◽  
Descriptive Statistics ◽  
Experimental Designs ◽  
Dioscorea Alata ◽  
Progressive Reduction ◽  
Dioscorea Rotundata ◽  
Swelling Power ◽  
Purple Yam

This study is aimed at evaluating the techno-functional properties of starches from several yam species (Purple yam, Hawthorn yam and Diamante 22-type yam). Analytical procedures were performed according to the methods described by different authors in order to calculate waterabsorption index (WAI), water-solubility index (WSI), swelling power (SP) and syneresis. Likewise, descriptive statistics and experimental designs for interpretation of the results were also performed. The results showed that Hawthorn yam has the highest WAI (15.15 g gel/g sample, at 90°C). While WSI was similar for all species, SP is dependent on the temperature with values of 16.10 g gel/g sample (Purple yam and Hawthorn yam), and 11.25 g gel/g sample at 90°C (Diamante 22-type yam). All yam species underwent progressive reduction in syneresis, which suggests that these types of starches could be used to manufacture foods that require maintaining moisture levels.

scholarly journals A Comparative Quality Evaluation of White Yam (Dioscorea Rotundata) and Water Yam (Dioscorea Alata) Chips as African Fries

2017 ◽  
Vol 2 (1) ◽  
Keyword(s):  
Moisture Content ◽  
Textural Properties ◽  
Peak Force ◽  
French Fries ◽  
Dioscorea Alata ◽  
Dioscorea Rotundata ◽  
Frying Time ◽  
Overall Acceptability ◽  
White Yam ◽  
Water Yam

This study was conducted to evaluate the quality characteristics of Dioscorea rotundata and Dioscorea alata as alternative to potato in French fries production and effect of frying time on the quality index and acceptability of resultant yam chips. The yam chips were pretreated by blanching for 10minutes at 90o C, and soaking in 5% citric and sodium metabisulphite acid solution for a period of 30minutes. The treated blanched yam chips were deep fried at 170o C for 21 minutes, but the chips were withdrawn at intervals of 3minutes to determine the moisture content, textural properties and sensory attributes of the chips. The proximate composition of the fried chips was evaluated using established procedures of the Association of Official Analytical Chemists (AOAC). The textural properties such as Peak force and deformation at break of the deep fried chips were determined using a Universal Instron testing machine.The fried yam chips were subjected to sensory analyses (colour, crispiness, mouthfeel, taste, overall acceptability) using a 9- point Hedonic scale. Data obtained were subjected to Analysis of Variance ANOVA and means separated by Duncan Multiple Range test. The result of the proximate analysis on the two varieties of raw yam tubers showed that wateryam (D.alata ) had a significant (p>0.05) higher moisture content (69.49%) and protein values (7.60%) than white yam (D. rotundata) having 64.84% and 4.55% respectively).D alata had a significant (p>0.05) high fibre content of 2.34 % compared to D rotundata which had 1.42%. On the other hand, D. rotundata, has greater amount of carbohydrate (26.70%) than D. alata with (20.18%). A significant (p< 0.05) lower moisture content existed for the fried chips samples from 3 minutes to 18 minutes for both white yam (54.32-32.76%) and water yam (61.32- 31.03%).Frying time had a significant lowering effect on the moisture content of fried chips. White yam (D. rotundata) showed significantly (p>0.05) high force at peak than wateryam (D. alata), with values of 26.30N, and 7.30N respectively. Results showed that frying time had significant (p>0 05) effects on the peak force and deformation at peak of the fried yam chips for the two varieties. The pre-treatments given to the yam chips produced from the two yam varieties, gave some desirable sensory characteristics. The sensory scores showed that fried white yam chips had a significant (p>0.05) highest score (7.14) compared to wateryam fried chips (6.39) at 21st minute frying time even in terms of colour, taste, mouthfeel and overall acceptability. The use of yam as a substitute for potato in French fries production would make fries to be more affordable and promote its utilization in French fries production.

scholarly journals Incidencia de virosis en ñame (dioscorea spp.) en cinco municipios del departamento de sucre, colombia

2016 ◽  
Vol 19 (1) ◽  
pp. 86-95
Author(s):  
Iris Payares ◽  
Javier Beltrán ◽  
Euriel Millán
Keyword(s):  
San Juan ◽  
Dioscorea Alata ◽  
Dioscorea Rotundata

En Colombia, el ñame (Dioscorea spp.) se cultiva en la región Caribe, siendo Dioscorea alata L. y Dioscorea rotundata Poir. las especies más cultivadas. Uno de los factores limitantes en estos cultivos son las enfermedades causadas por virus, principalmente por Potyvirus que ocasionan disminución en la producción de los tubérculos y pérdidas económicas significativas. El objetivo de este trabajo fue evaluar la incidencia de virosis en ñame en el departamento de Sucre. Se realizaron visitas a cultivos de Dioscorea alata y Dioscorea rotundata en cinco municipios del departamento y se midió la sintomatología foliar. Se tomaron muestras de hojas y se realizó diagnóstico para Potyvirus mediante la técnica ELISA-DAS indirecta. Además, se inocularon plantas indicadoras con extractos preparados a partir de plantas con síntomas virales y positivas para Potyvirus. Todos los cultivos visitados mostraron síntomas asociados a los Potyvirus del ñame, tales como bandeo, moteado, clorosis y deformación foliar. Los municipios con mayor incidencia sintomática fueron Sampués (82,5%), Sincelejo (79,5%) y San Juan de Betulia (71,6%). Se detectó Potyvirus en plantas sintomáticas y las plantas indicadoras desarrollaron síntomas similares a los encontrados en campo. Los cultivos de ñame del departamento de Sucre presentan alta incidencia de Potyvirus lo que sería causa de pérdidas económicas a los productores.

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