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Phylogenetics of the genus sorghum, genetic diversity and nutritional value of its cultivated species

Ng'uni, Dickson (2011). Phylogenetics of the genus sorghum, genetic diversity and nutritional value of its cultivated species. Diss. (sammanfattning/summary) Alnarp, Sweden : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2011:63
ISBN 978-91-576-7607-8
[Doctoral thesis]

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Abstract

Sorghum (Sorghum bicolor (L.) Moench) ranks fifth among cereal crops and second highest in production after maize in Africa particularly in the semi arid regions where it is a food security crop. This study assessed phylogenetic relationships of the species within the genus Sorghum, genetic diversity and the nutritional value of cultivated sorghum for its use for breeding and conservation.
The phylogenetic analyses based on sequence data from four chloroplast DNA (cpDNA) regions and the internal transcribed spacer (ITS) revealed that S. laxiflorum and S. macrospermum were more closely related to Eu-sorghum species than to any other section and that the former two species are best merged into one section. Assessment of 27 Zambian sorghum accessions and 14 accessions from Malawi, Tanzania and Zambia for genetic diversity based on microsatellite markers revealed a significant genetic variation within and largely among (>80%; p < 0.001) sorghum accessions. Bioassay for grain mineral contents of 27 farmer varieties of sorghum from southern Africa and 13 improved varieties showed that improved sorghum varieties were superior in macronutrients while farmer varieties showed superiority for grain Fe and Zn contents. Morphological characterization of 17 accessions from southern Africa revealed considerable variation among accessions and plant height, days to 50% flowering and inflorescence length were more important discriminating traits. The studies in this thesis provide insights into the extent and pattern of genetic relationships within the genus Sorghum and reveal significant genetic variation for nutritional value improvement.

Authors/Creators:Ng'uni, Dickson
Title:Phylogenetics of the genus sorghum, genetic diversity and nutritional value of its cultivated species
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :2011
Volume:2011:63
Number of Pages:59
Papers/manuscripts:
NumberReferences
INg’uni, D., Geleta, M., Fatih, M. & Bryngelsson, T. (2010). Phylogenetic analysis of the genus Sorghum based on combined sequence data from cpDNA regions and ITS generated well-supported trees with two major lineages. Annals of Botany 105(3), 471-480.
IINg’uni, D., Geleta, M & Bryngelsson, T. (2011). Genetic diversity in sorghum [Sorghum bicolor (L.) Moench] accessions of Zambia as revealed by simple sequence repeats (SSR). Hereditas 148, 52-62.
IIINg’uni, D., Geleta, M., Johansson, E., Fatih, M. & Bryngelsson, T. Characterization of the Southern African sorghum varieties for mineral contents: Prospects for breeding for mineral dense lines (African Journal of Food Science, in press).
IVNg’uni, D., Geleta, M., Fatih, M. & Bryngelsson, T. Comparative genetic diversity and nutritional quality variation among Southern African sorghum [Sorghum bicolor (L.) Moench] (Submitted).
VNg’uni, D., Geleta, M., Fatih, M. & Bryngelsson, T. Agromorphological traits variation in sorghum [Sorghum bicolor (L) Moench] germplasm from southern Africa (Manuscript)
Place of Publication:Alnarp, Sweden
Publisher:Dept. of Plant Breeding and Biotechnology, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-7607-8
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F30 Plant genetics and breeding
Subjects:Obsolete subject words > NATURAL SCIENCES
Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING
(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Biochemistry and Molecular Biology
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
Agrovoc terms:sorghum, phylogeny, chloroplasts, dna sequence, genetic variation, trace elements, primary nutrient, nutritive value
Keywords:cpDNA, genetic diversity, ITS, macronutrients, micronutrients, sorghum, phylogenetics, proteins, SSR
URN:NBN:urn:nbn:se:slu:epsilon-e-197
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-197
ID Code:8308
Department:(LTJ, LTV) > Plant Breeding and Biotechnology (until 121231)
Deposited By: Mr Dickson Ng'uni
Deposited On:02 Sep 2011 09:17
Metadata Last Modified:02 Dec 2014 10:47

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