771 research outputs found

    Pathways of genetic transfer from Tripsacum to Zea mays

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    Paediatric trauma care

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    Paediatric trauma care varies in different countries. In South Africa injury is the leading cause of death in the 5 - 14-yearold age group - 1,5 - 3,8 times higher than in the USA. In 1978 the Child Safety Centre was established and prospectively collected data on paediatric injuries. The various types of injuries are discussed. Trauma is responsible for the highest percentage of years of life lost but the least amount of money is being spent on research and prevention of injuries. The Child Accident Prevention Foundation of Southern Africa has been constituted to research, prevent and reduce the risk factors of the injuries and to improve facilities for the injured child

    Training South African clinician-scientists: Lessons from the University of Cape Town’s intercalated programme

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    In 2011, the Faculty of Health Sciences at the University of Cape Town, South Africa (SA), established the Clinician-Scientist Training Programme (UCTCSTP), consisting of intercalated BMedSci Hons/MB ChB and integrated MB ChB/MSc/PhD tracks. We report and reflect on the programme’s performance and challenges. The UCTCSTP has so far enrolled 71 students: 51 have received BMedSci Hons degrees and 4 have received Master’s degrees, while there are 14 BMedSci Hons, 4 MSc and 4 PhD candidates. Graduates have produced significant research outputs, and many remain actively engaged in research. The UCTCSTP has been successful in encouraging a cohort of future clinician-scientists, but should aim to broaden and improve its appeal to address the need to transform and grow the SA clinical academic workforce. As graduates progress with their postgraduate clinical training, they require institutional support and guidance, which may necessitate policy reform

    Similarities in Sectional Delimitation in Tripsacum and Zea (Gramineae)

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    Subtribe Tripsacinae of the tribe Andropogoneae comprises two New World genera, Tripsacum and Zea (Clayton, 1973). These “sister” genera (terminology of Hennig, 1966) are distinct morphologically and also karyotypically, with base chromosome numbers of n = 18 in Tripsacum and n = 10 in Zea. Doebley and litis (1980; see also litis and Doebley, 1980) radically revised sectional circumscription in Zea, and provided the first workable taxonomy for that genus

    Infraspecific variation and systematics of cultivatedSetaria italica, foxtail millet (Poaceae)

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    Foxtail millet (Setaria italica,) is grown as a cereal in southern Europe and in temperate, subtropical, and tropical Asia. Its closest wild relative isS. italica ssp.viridis (green foxtail). Green foxtail is native to temperate Eurasia, but was introduced and became widely established as a weed in temperate and warmer parts of the Americas. Spontaneous and cultivatedS. italica cross to produce fertile hybrids. Derivatives of such crosses, resembling foxtail millet in some inflorescence traits but with efficient natural seed dispersal, accompany the cereal across its range of cultivation. Giant green foxtail of Europe and the American corn belt is a weed of hybrid origin. Foxtail millet was domesticated in the highlands of central China; remains of cultivated foxtail millet are known from the Yang-shao culture period dating back some 5,000 yrs. Comparative morphology suggests that foxtail millet spread to Europe and India as a cereal soon after its domestication. Three cultivated races are recognized. Moharia, from Europe and southwestern Asia, includes cultivars with 5–52 culms, each bearing several, small, more or less erect inflorescences. Cultivars in race maxima are characterized by plants with 1–8 usually unbranched culms that bear large inflorescences; they occur in Transcaucasian Russia and the Far East. Race indica is intermediate in culm number (ave. 6.6) and inflorescence size between races moharia and maxima, and is cultivated in southern Asia

    Systematics and evolution of Eleusine coracana (Gramineae)

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    About 1400 accessions from India, Sri Lanka and Africa, and some of uncertain origin, were grown near Patancheru, India, and studied for 12 quantitative and nine qualitative characters. The systematics of E. coracana subsp. coracana, which is cultivated in eastern and southern Africa and in southern Asia, and E. coracana subsp. africana, which grows wild in Africa and as a weed in Asia and America, are given in detail. Derivatives of hybrids between the two subspecies are companion weeds of the crop in Africa. Cultivated subsp. coracana is divided into five races on the basis of inflorescence morphology. Race Coracana is widely distributed across the range of cultivation and may have been cultivated in Africa 5000 years ago. Racial evolution took place in Africa and races Vulgaris, Elongata, Plana and Compacta evolved from race Coracana, and were introduced into India some 3000 years ago. Little independent racial evolution took place in India

    Diversity in Kodo millet,Paspalum scrobiculatum

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    Paspalum scrobiculatum is widely distributed in damp habitats across the Old World tropics. It is harvested as a wild cereal in west Africa and in India.The species was domesticated in India some 3,000 yr ago. It is grown in India from Kerala and Tamil Nadu in the south, to Rajasthan, Uttar Pradesh and West Bengal in the north. Kodo millet is variable but lacks racial differentiation. The species was apparently domesticated across its range of present-day cultivation. HybridizationwithwildP. scrobiculatum , which commonly invades fields of kodo millet, obscures racial differentiation. Weedy kodo is harvested with the crop, making it difficult to distinguish wild and cultivated complexes ofP. scrobiculatum. Wild, weed and cultivated kinds merge in all characters studied

    Domestication of Sawa millet (Echinochloa colona)

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    Two species of Echinochloa are grown as cereals. Echinochloa crusgalli is native to temperate Eurasia and was domesticated in Japan some 4,000 yr ago. Echinochloa colona is widely distributed in the tropics and subtropics of the Old World. It was domesticated in India. Echinochloa colona is morphologically allied to E. crusgalli, but hybrids between them are sterile. Echinochloa colona differs consistently from E. crusgalli in having smaller spikelets with membran-aceous rather than chartaceous glumes. Hybrids between wild and cultivated taxa of E. colona and between those of E. crusgalli are fertile. Cultivated E. colona is variable. It is grown as a cereal across India, Kashmir and Sikkim. Four morphological races are recognized, although these do not have geographical, ecological or ethnological unity. Race laxa is confined to Sikkim where races robusta, intermedia and stolonifera are also grown. In India, races robusta, intermedia and stolonifera are often grown as mixtures, and Echinochloa is sometimes grown as a mixture with other cereals, particularly Setaria italica (foxtail millet) or Eleusine coracana (finger millet). The species is planted on poor soil, and some cultivars mature in less than 2 mo. They hold considerable promise as cereals for the semiarid tropics

    Analysis of recombination rate in female and male gametogenesis in pearl millet (Pennisetum glaucum) using RFLP markers

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    Sex as a factor affecting recovered recombination in plant gametes was investigated in pearl millet, Pennisetum glaucum, by using reciprocal three-way crosses [(AxB)xCvCx(A x B)]. The two populations were mapped at 42 loci pre-selected to cover the majority of the genome. No differences in recombination distances were observed at the whole-genome level and only a few individual linkage intervals were found to differ, all in favour of increased recombination through the male. Distorted segregations found in the three-way crosses provide evidence of post-gametic selection for particular gene(s) or chromosome regions. The significance of these results for the design of pearl millet breeding programmes and inheritance experiments, as well as for other experimental strategies, is discussed
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