Yam is an important staple cash crop, which constitutes 53% of total root and tuber consumption in west africa. The cuttings established better and produced more mini tubers in carbonized rice husk than in cocopeat 100 days after planting. In this study, 26 in vivo pollinated ovaries with ovules were obtained from 43 pollinated flowers after 10, 20, 30, 40 days after pollination dap. Dioscorea batatas is a perennial growing to 3 m 9ft by 1. Starches from three cultivars of dioscorea rotundata namely, giwa, lagos, and sule, were characterized for their physicochemical and material properties. Dioscorea rotundata and dioscorea alata are the most economical and popularly cultivated species of yam in nigeria due to their high yielding qualities. Introduction yam mosaic virus ymv genus potyvirus, family potyviridae is the most important virus infecting both cultivated and wild yams especially dioscorea rotundata, d. Dioscorea rotundata white yam tuber to rot infecting fungi was investigated. Pdf ploidy level studies on the dioscorea cayenensis. Dente in the laboratory with ambient temperatures of 26.
The mean life spans of the female insect that is from hatch to death on dioscorea rotundatavar. Pdf mini tuber production using yam dioscorea rotundata. Dioscorea rotundata the white yam is native to west africa. Developmental morphology of seedlings of dioscorea cayenensis. Physicochemical and material properties of starches from. Increasing productivity of yam dioscorea rotundata. Pona tubers in storage faster than on the other varieties. Fresh and stored samples were analyzed for changes in color, ascorbic acid and organoleptic qualities. Effects of different concentrations of chemical sprout. It is a cheap source of carbohydrate in the diets of millions of people worldwide and in tropical west africa. Learn how to change how pdfs are viewed in firefox with either the builtin viewer or a third party tool. Aspergillus niger, rhizopus stolonifera, botryodiplodia theobromae, fusarium oxysporum, penicillium marnessei and four bacteria species.
Dioscorea species constitute one of the staple carbohydrate foods for people in the tropics 2. Starches obtained from four dioscorea species namely dioscorea dumetorum bitter, dioscorea oppositifolia chinese, dioscorea alata water, and dioscorea rotundata white have been evaluated as binding agents in chloroquine phosphate tablet formulations in comparison with official corn starch. About gringlobal choose language cesky eng english espanol francais portugues system. Evaluation of starches obtained from four dioscorea species.
Dioscorea villosa supplement health benefits, dosage, side. The genus dioscorea includes about 350800 species distributed largely in the tropics, but also in warm and temperate regions. Water yam, dioscorea alata, the second most cultivated species, originated from asia. Cluster analyses for both the isozymic and morphological data separated the 2 d. Weed interference and control in white yam dioscorea. Pdf field performance of seed yam dioscorea rotundata. There are five other dioscorea species that are grown to some extent in the pacific today.
Which routes should operate along the downtown transit connector dtc opening in 2019. The cuttings established better and produced more mini tubers in carbonized. Pdf drying characteristics of yam slices dioscorea. New zealand visa application center third party authorization. Presentday cultivar diversity and farmers perception on their tolerance to. The record derives from wcsp data supplied on 20120323 which reports it as a synonym record 240844 with original publication details.
Several days after pollination, 153 ovules were observed. Evaluation of guinea white yam dioscorea rotundata poir. Mini tubers were produced from two varieties of dioscorea rotundata using vine cuttings planted in carbonized rice husk or cocopeat in a screen house. Adobe pdf files to read and print a pdf file, you must have adobe. Genetic structure and diversity in the dioscorea cayenensis d. You can download a version suitable for your system, free of. Increasing productivity of yam dioscorea rotundata through improved cultural management practice in south south nigeria ogboi. Communicating beyond traditional networks edited by korea tesol conference proposal selection commitee. Many cultivars of the african dioscorea cayenemis d. To accelerate markerassisted breeding of yam, we performed genome analysis of white guinea yam. Department of agricultural technology, delta state polytechnic, ozoro delta state, nigeria abstract yams dioscorea are among the food sources in the country especially in times of food scarcity. With a free trial of our online pdf converter, you can convert files to and from pdf for free, or sign up for one of our memberships for limitless access to our file converters full suite of tools.
This paper aims to characterize the planttoplant variability in yield and to identify its underlying causes for the two major yam species dioscorea alata and dioscorea rotundata. Effect of three storage methods on the quality and shelflife. This is an historical document made available through the national agricultural library digital collections. Assessment of microbial changes and nutritional qualities.
Predictive equilibrium moisture content equations for yam dioscorea rotundata, poir flour and hysteresis phenomena under practical storage conditions author links open overlay panel o. Dioscorea oppositifolia, a yam native to the indian subcontinent dioscorea polystachya, chinese yam, a widely cultivated yam native to china. Dioscorea rotundata white yam, guinea yam or african yam is the most important species of yam in west africa because of its economic value and uses. Presentday cultivar diversity and farmers perception on their tolerance to tuber dry rot. Nondestructive shoot biomass evaluation using a handheld. First report of meloidogyne enterolobii causing tuber. Yam is a staple food crop in west africa within the yam zone miege 1954, coursey 1965, 1967, as also in the cadbean, a part of southeast asia and the pacific islands. We studied here, the molecular basis of domestication in african yam. Mini tubers were produced from two varieties of dioscorea rotundata using vine cuttings planted in carbonized rice husk or coco.
Kolombia, adjiguita yao, p lava kumar, ao claudiuscole, gerrit karssen, nicole viaene, d coyne, and wim bert. The main purpose of this thesis is to simulate the normal impact of a. White or guinea yam dioscorea rotundata, grown for its underground tubers, is an important food in west africa. Koli skip to main content we use cookies to distinguish you from other users and to provide you with a better experience on our websites. Yam traditional pacific island crops research guides. Yam is a vine, herbaceous, tuberous with stem twinning clockwise or counter clockwise, glabrous or sometimes producing prickles, some. However, attack by planococcus citri results in shriveling of the tubers, making them become light and unpalatable. Pdf documents can contain links and buttons, form fields, audio, video, and business logic. They are mostly grown for their starchy tubers both cultivated and wild and for medicinal properties. Mini tuber production using yam dioscorea rotundata vines. Jun 14, 2018 bases all of its recommendations on published scientific research. This species of yam is an important food crop in parts of the indian subcontinent and particularly in equatorial w.
In the west african yam zones, white yam dioscorea rotundata, water yam dioscorea alata and yellow yam dioscorea cayenensis are the most common species aidoo, 2009. Effects of npk fertilizer on tuber yield, starch content. Progress in yam breeding is constrained by variable flowering behaviour, making hybridization difficult. Genome sequencing of the staple food crop white guinea. Africa, where the starchy tuber is cooked and pounded into what resembles firm mashed potato for use as an accompaniment to stewed dishes. To determine the potential of tibs in improving the yam seed system, 23 databases were consulted and three returned a total of eight publications with only 2 for dioscorea rotundata.
Dioscorea rotundata used in this study was subjected to some preliminary operations such as peeling, washing and slicing 5 mm thick, precooking for 10 min. From dictatorship to democracy a conceptual framework for liberation fourth u. Pona to the rest of the varieties, as it developed faster and laid more eggs 497. Synonyms common names economic importance distributional range references other web references. The pdf file can be easily downloaded to your computer, enabling you to view it offline at your convenience.
The white yam dioscorea rotundata which originated in west africa is the most important species of yam cultivated for human nutrition. It is indigenous to west africa, as is the yellow guinea yam, dioscorea cayenensis. Improved propagation methods to raise the productivity of. Freshly dried and reconstituted yam flakes were judged highly acceptable compared to conventionally. The white yam dioscorea rotundata poir was characterized, drum dried to different moisture levels, and stored at temperatures of 21. Dioscorea rotundata ufenyi and dioscorea bulbifera wild were used in interspecific hybridization or crossing.
Pdf architectural analysis of root system of sexually vs. The portable document format pdf is a file format developed by adobe in the 1990s to present documents, including text. Phytochemical screening and nutritional quality of yam. The atlas of florida plants provides a source of information for the distribution of plants within the state and taxonomic information. Interspecific crossing between yam species dioscorea. Architectural analysis of root system of sexually vs.
Ramser j, weising k, terauchi r, kahl g, lopezperalta c, terhalle w. The species is dioecious individual flowers are either male or female, but only one sex is to be found on any one plant so both male and female plants must be grown if seed is required. In addition, dioscorea alata is an important prestige food in papua new guinea, fiji, tonga, vanuata, samoa and the federated states of micronesia. Were a trusted resource because we dont sell or even advertise supplements if youre tired of wasting time and money on supplements that dont work, our 17 supplement guides will help you figure out precisely what to take and what to skip based on your health goals and the latest scientific evidence. We would like to show you a description here but the site wont allow us. In florida, herbarium records now reported for naturalized populations in 7 counties. Obtaining good quality planting material for yam cultivation. But domestication of these root and tubers crops is also associated with gigantism of storage organs and changes of habitat.
Effects of npk fertilizer on tuber yield, starch content and dry matter accumulation of white guinea yam dioscorea rotundata in a forest alfisol of south western nigeria volume 21 issue 4 g. Molecular marker based taxonomy and phylogeny of guinea yam dioscorea rotundata d. Isolation was made from the periphery of the rotted tuber tissues, followed by a pathogenicity test and identification of isolates. Zone 911, full sun, sun to partial shade, light shade. All species are easy to grow from seeds, bulbils little tubers, tubers, or cuttings. Effect of extrusion cooking of white yam dioscorea. Yam, a tropical crop in the genus dioscorea, has as many as 600 species out of which six are economically important staple species. It contributes significantly to the diet of many people in the tropics and subtropics of africa, asia and the caribbean as a major source of carbohydrate fao, 2002. Pdf dehydration and rehydration characterization of yam. Isolation of nine microorganisms from rotten dioscorea. Dioscorea rotundata is the most popular variety of yams grown in nigeria and over 600 species are cultivated all over the world 3.
They can be signed electronically, and you can easily view pdf files. Dioscorea rotundata and assembled a 594mb genome, 76. Molecular marker based taxonomy and phylogeny of guinea yam. Most documents on our website are posted in one or more of three formats. I abstract droplet dynamics involves multiscale forces from inertia body force, interior viscous shear stress to surface tension. This handbook covers botany, varieties, various aspects of cultivation, harvest and postharvest information, preparation, and composition for dioscorea rotundata and d. The effect of slice thickness on the dehydration and rehydration characteristics of yam was studied in a refractance window tm rw type dryer constructed from a laboratory water bath. A blend of white yam grit 750 m and bambara nut flour 500 m in a ratio of 4. Flowering intensity in white yam dioscorea rotundata. Making acrobat pdf files accessible uh hilo university of hawaii.
White yam dioscorea rotundata important information. Nutritional quality of yam dioscorea dumetorum and d. However, the lack of genetic and genomic tools has impeded the. Media in category dioscorea rotundata the following 3 files are in this category, out of 3 total. Files are available under licenses specified on their description page. Oct 12, 2017 after cereals, root and tuber crops are the main source of starch in the human diet. The land races selected for the present study are agbocha, adaka, aloshi, nwanyieri, dorban, heabalo, dente, obiaturugo, ame and atalibe. Escambia, gadsden, leon, levy, charlotte, lee, and dade wunderlin et al. Dioscorea rotundata, yam, dormancy, phases of dormancy, plant growth regulator, primary thickening meristem, tuber germinating meristem, shoot apical meristem. Dioscorea rotundata and bambara groundnut vigna subterranean blends 102 t. Plant in fertile, welldrained soil, in full sun or partial shade.
Purpose of this meeting ripta is considering changes to downtown providence bus service we want your input. The objectives are improving patient ow by reducing patient waiting times, and improving sta work ow by balancing workload and reducing overtime. Drying characteristics of yam slices dioscorea rotundata in a convective hot air dryer. This implies that citrus mealybug multiplies faster and destroys dioscorea rotundata var. Evaluation of white yam dioscorea rotundata genotypes for arbuscular mycorrhizal colonization, leaf nutrient concentrations and tuber yield under npk fertilizer application. Sixty tubers of dioscorea rotundata, the white yam varieties, amula, ogoja, hembamkwase and gbongu 15 pieces of each variety showing visible signs of rot and 44 healthy ones were purchased from markets in ukum, katsina ala, logo, vandeikya and guma local government areas of benue state, between the months of. It serves as a staple food thus forming a major source of energy to the diet. Dioscorea is a genus of over 600 species of flowering plants in the family dioscoreaceae, native throughout the tropical and warm temperate regions of the world.
Different ways to access pdf files with firefox firefox help. F e b 1 4, 2 0 1 6 ravena shopping shuttle between ravena to colonie center and crossgates mall shuttle only operates on tuesday 8. Physicochemical properties of extrudates from white yam and. It is sometimes treated as separate species from dioscorea cayennensis. Other species of yams grown include the trifoliate yam dioscorea dumetorum and aerialbulbils yam dioscorea bulbifera. Dioscorea opposita is an obsolete synonym of two species of yams. Examining the physicochemical, functional and rheological. First report of meloidogyne enterolobii causing tuber galling damage on white yam dioscorea rotundata in nigeria. Predictive equilibrium moisture content equations for yam. Consider if your document needs to be a pdf before it is posted online. All structured data from the file and property namespaces is available under the creative commons cc0 license.
The board of trustees of the royal botanic gardens, kew. View picture of white guinea yam dioscorea rotundata at daves garden. Starch biosynthesis was certainly a significant target for selection during the domestication of these crops. Mineral and toxicant levels in yam dioscorea rotundata diets.
The website also provides access to a database and images of herbarium specimens found at the university of south florida and other herbaria. To manipulate dormancy to allow offseason planting and more than one generation per year requires that the duration of phase i is shortened. A linear regression model was constructed to predict shoot biomass through bayesian analysis using ndvi as a. In florida, herbarium records now reported for naturalized. Four different molecular techniques were used to assess relationships among 21 accessions of guinea yam dioscorea rotundata and dioscorea cayenensis and 21 accessions. To determine the potential of tibs in improving the yam seed system, 23 databases were consulted and three returned a total of eight publications with only 2 for dioscorea rotundata cayenensis. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Phases of dormancy in yam tubers dioscorea rotundata.
The critical period of weed interference in white yam was between the 8th and 16th week after planting w. C in an air oven tray drier model 1999, made in germany with an air flow of 8 cfu for 8 h. Dioscorea rotundata white guinea yam, dioscorea alata yellow yam, dioscorea bulbifera aerial yam, dioscorea esculant chinese yam and dioscorea dumetorum trifoliate yam. Abstract white guinea yam dioscorea rotundata poir. Differential rate of dry rot in dioscorea rotundata white. Proceedings of the 1997 korea tesol conference, october 35, 1997, kyoungju, south korea technology in education.
New zealand visa application center third party authorization form date. Five yam tuber varieties were investigated for microorganisms that cause yam tuber rot from five local government areas of benue state, nigeria, between the months of march 2014 to march 2015. The rat diets casein control and protein free diet were formulatedaccording to method of lape 17 and fasuyi. The climbing growth habit of white yam dioscorea rotundata coupled with its inability to shade the ground completely at any stage of its growth and development makes it very susceptible to weed interference. Carl dusthimer, hannam university, taejon demetra gates, taegu national university of education. The vast majority of the species are tropical, with only a few species extending into temperate climates.
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