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Jean-louis Noyer - One of the best experts on this subject based on the ideXlab platform.

  • Development of DNA microsatellite markers in tropical yam (Dioscorea sp.)
    Molecular Ecology Notes, 2006
    Co-Authors: Serge Tostain, Nora Scarcelli, Philippe Brottier, Jean-leu Marchand, Jean Louis Pham, Jean-louis Noyer
    Abstract:

    We developed new simple sequence repeat (SSR) markers in different species of yam (Dioscorea sp.). A microsatellite-enriched bank was created from Dioscorea alata, Dioscorea abyssinica and Dioscorea praehensilis. Sixteen polymorphic loci were characterized. Several of these markers are transferable to species of other Dioscorea sections. (Resume d'auteur)

  • Use of cpSSRs for the characterisation of yam phylogeny in Benin
    Genome, 2005
    Co-Authors: H. Chair, X. Perrier, C. Agbangla, J.l. Marchand, O. Daïnou, Jean-louis Noyer
    Abstract:

    The Dioscorea cayenensis - Dioscorea rotundata species complex is the most widely cultivated yam in West Africa. This species complex has been described as deriving from wild yams belonging to the Enanthiophyllum section through domestication by African farmers. To study patterns of yam evolution and to establish phylogenetic relationships existing between wild and cultivated species sampled in Benin, we investigated changes in chloroplast DNA simple sequence repeats (cpSSR) in 148 yam accessions selected to cover the wider possible genetic diversity existing in the country. Dioscorea cayenensis and D. rotundata share the same haplotype. The morphotype "abyssinica" appeared to be subdivided into 2 haplotypes. One of these haplotypes shares the same haplotype with the Dioscorea cayenensis - Dioscorea rotundata species complex and with morphotypes praehensilis, suggesting that they might belong to the same species. Relationships among sections Lasiophyton, Macrocapaea, Opsophyton, and Enanthiophyllum were clarified, and some taxonomic changes within the Enanthiophyllum section were suggested. Dioscorea minutiflora, D. smilacifolia, and D. burkilliana might be considered as 1 single genetic group, and they are suspected of belonging to the same species

Bala Nambisan - One of the best experts on this subject based on the ideXlab platform.

  • Carbohydrate Metabolism during Dormancy and Sprouting in Yam (Dioscorea) Tubers: Changes in Carbohydrate Constituents in Yam (Dioscorea) Tubers during Dormancy and Sprouting
    Journal of Agricultural and Food Chemistry, 1996
    Co-Authors: C. S. Hariprakash, Bala Nambisan
    Abstract:

    Changes in carbohydrate constituents were stuided in tubers of Dioscorea rotundata, Dioscorea alata, and Dioscorea esculenta during dormancy and sprouting for a period of 90 days. Decrease in starch content (35%) was the most significant change observed in all yam species. This decrease was reflected in proximal, middle, and distal regions of tubers. More than 50% of the starch reduction took place during the dormancy period. The mobilization of starch to sugars and its utilization was reflected in fluctuating levels of reducing and nonreducing sugars during presprouting/sprouting periods. Changes were also observed in the amylose fraction in starch. Chromatographic sugar analysis in tubers indicated the presence of glucose and sucrose in fresh tubers. Fructose and maltose were detected during dormancy/sprouting periods. Keywords: Dioscorea tubers; carbohydrates; dormancy; sprouting

Susan Seal - One of the best experts on this subject based on the ideXlab platform.

  • Complete genome sequence of a new member of the genus Badnavirus, Dioscorea bacilliform RT virus 3, reveals the first evidence of recombination in yam badnaviruses.
    Archives of Virology, 2017
    Co-Authors: Moritz Bömer, Ajith I. Rathnayake, Goncalo Silva, Paul Visendi, Susan Seal
    Abstract:

    Yams (Dioscorea spp.) host a diverse range of badnaviruses (genus Badnavirus, family Caulimoviridae). The first complete genome sequence of Dioscorea bacilliform RT virus 3 (DBRTV3), which belongs to the monophyletic species group K5, is described. This virus is most closely related to Dioscorea bacilliform SN virus (DBSNV, group K4) based on a comparison of genome sequences. Recombination analysis identified a unique recombination event in DBRTV3, with DBSNV likely to be the major parent and Dioscorea bacilliform AL virus (DBALV) the minor parent, providing the first evidence for recombination in yam badnaviruses. This has important implications for yam breeding programmes globally.

Mustapha Bousalem - One of the best experts on this subject based on the ideXlab platform.

Muluneh Tamiruoli - One of the best experts on this subject based on the ideXlab platform.

  • genome analyses reveal the hybrid origin of the staple crop white guinea yam Dioscorea rotundata
    Proceedings of the National Academy of Sciences of the United States of America, 2020
    Co-Authors: Yu Sugihara, Kwabena Darkwa, Hiroki Yaegashi, Satoshi Natsume, Motoki Shimizu, Akira Abe, Akiko Hirabuchi, Kazue Ito, Kaori Oikawa, Muluneh Tamiruoli
    Abstract:

    White Guinea yam (Dioscorea rotundata) is an important staple tuber crop in West Africa. However, its origin remains unclear. In this study, we resequenced 336 accessions of white Guinea yam and compared them with the sequences of wild Dioscorea species using an improved reference genome sequence of D. rotundata In contrast to a previous study suggesting that D. rotundata originated from a subgroup of Dioscorea praehensilis, our results suggest a hybrid origin of white Guinea yam from crosses between the wild rainforest species D. praehensilis and the savannah-adapted species Dioscorea abyssinica We identified a greater genomic contribution from D. abyssinica in the sex chromosome of Guinea yam and extensive introgression around the SWEETIE gene. Our findings point to a complex domestication scenario for Guinea yam and highlight the importance of wild species as gene donors for improving this crop through molecular breeding.