scholarly journals Population Genomics of Yams: Evolution and Domestication of Dioscorea Species

2021 ◽  
Author(s):  
Yu Sugihara ◽  
Aoi Kudoh ◽  
Muluneh Tamiru Oli ◽  
Hiroki Takagi ◽  
Satoshi Natsume ◽  
...  
Keyword(s):  
Whole Genome Duplication ◽  
Population Genomics ◽  
Central Africa ◽  
Hybrid Origin ◽  
History Of ◽  
Determination System ◽  
West And Central Africa ◽  
Dioscorea Species ◽  
Sex Determination System ◽  
Orphan Crop

AbstractYam is a collective name of tuber crops belonging to the genus Dioscorea. Yam is important not only as a staple food crop but also as an integral component of society and culture of the millions of people who depend on it. However, due to its regional importance, yam has long been regarded as an “orphan crop” lacking a due global attention. Although this perception is changing with recent advances in genomics technologies, domestication processes of most yam species are still ambiguous. This is mainly due to the complicated evolutionary history of Dioscorea species caused by frequent hybridization and polyploidization, which is possibly caused by dioecy that imposed obligate outcrossing to the species of Dioscorea. In this chapter, we provide an overview of the evolution of Dioscorea and address the domestication of yam from population genomics perspectives by focusing on the processes of hybridization and polyploidization. A review is given to the recent population genomics studies on the hybrid origin of D. rotundata in West and Central Africa, the global dispersion of D. alata through human migrations, and the whole-genome duplication of the South America species of D. trifida. In the end, we give a summary of current understanding of sex-determination system in Dioscorea.

Spirits and Healing in West and Central Africa: A New Synthesis

2021 ◽  
Author(s):  
Wyatt MacGaffey
Keyword(s):  
Social Life ◽  
Central Africa ◽  
Well Being ◽  
Social Regulation ◽  
Effect Change ◽  
African Religion ◽  
Cognitive Framework ◽  
Living Dead ◽  
History Of ◽  
West And Central Africa

Though seemingly innocent, descriptive, and even commendatory, both “spirits” and “healing” are problematic terms in the history of African studies. Rather than identifying well-bounded domains of African life, both of them have evolved from the history of European attitudes toward Africa. “Spirits” often give rise to problems of well-being that “healing” is called upon to solve. Despite this close connection, spirits have been the primary subject matter of religious studies, whereas healing is among the concerns of anthropology. The study of African religion has thus come to be divided between two disciplines embodying the distinction between “belief” and “knowledge,” the irrational and the rational, developed in Europe during the Enlightenment. Anthropology itself has long divided social life into the separate domains of religion, politics, and economics, assigning the study of each to a different discipline with its own preoccupations and specialized vocabulary. This ethnocentric template misrepresented African societies whose institutions were unlike those of Europe. In the forest zones of West and Central Africa a particular set of beliefs and practices regulated the use of power for personal and collective well-being. Power, or the ability to effect change for good or ill, was and is still thought to be derived from forces called “spirits,” which are in fact as much material as spiritual. Following special procedures, gifted persons obtain power from an otherworld that is simultaneously the earth itself and the land of “the living dead,” who are buried in it. The uses of such power to kill or to cure, for collective or private benefit, define a contrast set of four roles—called for convenience chief, priest, witch, and magician—whose functions are simultaneously moral, political, economic, and therapeutic. This system is open to novel revelations within a stable cognitive framework, and adapts to new conditions. Different ideologies and practices of social regulation are found in other parts of Africa.

scholarly journals The fate of African mask in the works of French-speaking writers in West and Central Africa

2021 ◽  
Vol 27 (3) ◽  
pp. 202-209
Author(s):  
Nina D. Lyakhovskaya
Keyword(s):  
Central Africa ◽  
Francophone Literature ◽  
Early 21St Century ◽  
Ancestor Cult ◽  
The Future ◽  
French Speaking ◽  
History Of ◽  
West And Central Africa ◽  
African Writers ◽  
The 1960S

The article examines the attitude of contemporary African writers to the traditional zoomorphic and anthropomorphic masks. In the 1960s–70s, for the supporters of the theory of negritude, the sacred mask embodied the spirit of ancestors and an inextricable connection with tradition. In a transitional era (the 1990s – the early 21st century), the process of desacralisation of the mask has been observed and such works appear in which the idea of the death of tradition is carried out. The article consistently examines the history of the emergence and strengthening of interest in the image of the African mask as the most striking symbol of African traditions on the part of cultural, art and scientific workers and the reflection of this symbol in the works of representatives of Francophone literature in West and Central Africa in different periods of time. The article concludes about the transformation of the views of the studied writers on the future of African traditions from an enthusiastic and romantic (as, for example, in the lyrics of Léopold Sédar Senghor or Samuel-Martin Eno Belinga) attitude to the images of the African past and tradition – masks, ancestor cult – to despair and bitterness from the awareness of the desacralisation of traditional objects and images and the profanation of tradition under the pressure of the realities of the present day (drama by Koffi Kwahulé). The attitude of African writers to the image of the mask, which is directly related to the themes of preserving traditions and the search of their identity by African literary heroes, is gradually changing, demonstrating the pessimistic view of Francophone African writers on the future of African traditions.

scholarly journals The African Bullfrog (Pyxicephalus adspersus) genome unites the two ancestral ingredients for making vertebrate sex chromosomes

2018 ◽  
Author(s):  
Robert D. Denton ◽  
Randal S. Kudra ◽  
Jacob W. Malcom ◽  
Louis Du Preez ◽  
John H. Malone
Keyword(s):  
Sex Chromosomes ◽  
Sex Chromosome ◽  
Genomic Sequence ◽  
Gene Dose ◽  
Ancestral Chromosome ◽  
Heteromorphic Sex Chromosomes ◽  
History Of ◽  
Determination System ◽  
Repeated Use ◽  
Sex Determination System

ABSTRACTHeteromorphic sex chromosomes have evolved repeatedly among vertebrate lineages despite largely deleterious reductions in gene dose. Understanding how this gene dose problem is overcome is hampered by the lack of genomic information at the base of tetrapods and comparisons across the evolutionary history of vertebrates. To address this problem, we produced a chromosome-level genome assembly for the African Bullfrog (Pyxicephalus adspersus)—an amphibian with heteromorphic ZW sex chromosomes—and discovered that the Bullfrog Z is surprisingly homologous to substantial portions of the human X. Using this new reference genome, we identified ancestral synteny among the sex chromosomes of major vertebrate lineages, showing that non-mammalian sex chromosomes are strongly associated with a single vertebrate ancestral chromosome, while mammals are associated with another that displays increased haploinsufficiency. The sex chromosomes of the African Bullfrog however, share genomic blocks with both humans and non-mammalian vertebrates, connecting the two ancestral chromosome sequences that repeatedly characterize vertebrate sex chromosomes. Our results highlight the consistency of sex-linked sequences despite sex determination system lability and reveal the repeated use of two major genomic sequence blocks during vertebrate sex chromosome evolution.

A history of botanical collections in the Luangwa Valley, Zambia

1998 ◽  
Vol 25 (2) ◽  
pp. 283-291
Author(s):  
P.S.M. PHIRI ◽  
D.M. MOORE
Keyword(s):  
Eighteenth Century ◽  
Environmental Impact ◽  
Impact Assessment ◽  
Vascular Plants ◽  
Central Africa ◽  
Peak Activity ◽  
Historical Account ◽  
History Of ◽  
The 1960S ◽  
Made In

Central Africa remained botanically unknown to the outside world up to the end of the eighteenth century. This paper provides a historical account of plant explorations in the Luangwa Valley. The first plant specimens were collected in 1897 and the last serious botanical explorations were made in 1993. During this period there have been 58 plant collectors in the Luangwa Valley with peak activity recorded in the 1960s. In 1989 1,348 species of vascular plants were described in the Luangwa Valley. More botanical collecting is needed with a view to finding new plant taxa, and also to provide a satisfactory basis for applied disciplines such as ecology, phytogeography, conservation and environmental impact assessment.

From Stonehenge to Samarkand

2006 ◽  
Author(s):  
Brian Fagan
Keyword(s):  
Gustave Flaubert ◽  
Central Africa ◽  
British Museum ◽  
Holy Land ◽  
Cruise Ship ◽  
Modern Times ◽  
Ancient Civilization ◽  
Machu Picchu ◽  
History Of ◽  
The Silk Road

Ever since Roman tourists scratched graffiti on the pyramids and temples of Egypt over two thousand years ago, people have traveled far and wide seeking the great wonders of antiquity. In From Stonehenge to Samarkand, noted archaeologist and popular writer Brian Fagan offers an engaging historical account of our enduring love of ancient architecture--the irresistible impulse to visit strange lands in search of lost cities and forgotten monuments. Here is a marvelous history of archaeological tourism, with generous excerpts from the writings of the tourists themselves. Readers will find Herodotus describing the construction of Babylon; Edward Gibbon receiving inspiration for his seminal work while wandering through the ruins of the Forum in Rome; Gustave Flaubert watching the sunrise from atop the Pyramid of Cheops. We visit Easter Island with Pierre Loti, Machu Picchu with Hiram Bingham, Central Africa with David Livingstone. Fagan describes the early antiquarians, consumed with a passionate and omnivorous curiosity, pondering the mysteries of Stonehenge, but he also considers some of the less reputable figures, such as the Earl of Elgin, who sold large parts of the Parthenon to the British Museum. Finally, he discusses the changing nature of archaeological tourism, from the early romantic wanderings of the solitary figure, communing with the departed spirits of Druids or Mayans, to the cruise-ship excursions of modern times, where masses of tourists are hustled through ruins, barely aware of their surroundings. From the Holy Land to the Silk Road, the Yucatán to Angkor Wat, Fagan follows in the footsteps of the great archaeological travelers to retrieve their first written impressions in a book that will delight anyone fascinated with the landmarks of ancient civilization.

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