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Genetic Diversity, Phylogenetics and Molecular Systematics of Guizotia Cass. (Asteraceae)

Geleta, Mulatu (2007). Genetic Diversity, Phylogenetics and Molecular Systematics of Guizotia Cass. (Asteraceae). Diss. (sammanfattning/summary) SLU : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2007:27
ISBN 978-91-576-7326-8
[Doctoral thesis]

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The genus Guizotia belongs to the tribe Heliantheae in the family Asteraceae. It has been placed under different subtribes. The genus has its center of origin, distribution and genetic diversity in Ethiopia, where G. abyssinica (niger) has been domesticated. Amplified Fragment Length Polymorphism (AFLP), Random Amplified Polymorphic DNA (RAPD) and DNA sequencing were applied to study the genetic diversity, phylogenetics, and molecular systematics of this genus. A large number of niger populations, representing all regions in Ethiopia where this crop is grown, was investigated using AFLP and RAPD molecular marker techniques. The extent of genetic variation in niger is distributed throughout its growing regions, regardless of the extent and altitude of cultivation. Despite the fact that most of the variation was within populations, significant population differentiation was obtained (AMOVA; P < 0.001) in all guizotias. It is concluded that both G. abyssinica and its wild and/or weedy relatives have wide genetic bases that need to be conserved and utilized for the improvement of G. abyssinica. Further collection of niger germplasm and exploration and conservation of highly localized guizotias are recommended. Most of the diagnostic markers generated from AFLPs and RAPDs in this study were specific to G. arborescens and G. zavattarii. Phylogenetic analyses of the genus Guizotia were undertaken based on molecular sequence data from the internal transcribed spacers (ITS) and five chloroplast DNA regions. The analyses revealed a close phylogenetic relationship between G. abyssinica and G. scabra ssp. schimperi and support the previous suggestion that the latter is the progenitor of the former. According to this study, G. scabra ssp. scabra, G. scabra ssp. schimperi, and the Chelelu and Ketcha populations are best viewed at present as separate species within the genus Guizotia. Those perennial guizotias with highly localized geographic distribution appears to have evolved first during the evolutionary history of the genus. This study supports the placement of the genus Guizotia within the subtribe Milleriinae. It is suggested that the present species composition of Guizotia and the subtribal placement of the genus need to be redefined.

Authors/Creators:Geleta, Mulatu
Title:Genetic Diversity, Phylogenetics and Molecular Systematics of Guizotia Cass. (Asteraceae)
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2007
Number of Pages:48
ALLI. Geleta, M., Bryngelsson, T., Bekele, E. & Dagne, K. 2006. Genetic diversity of Guizotia abyssinica (L. f.) Cass. (Asteraceae) from Ethiopia as revealed by Random Amplified Polymorphic DNA (RAPD). Genetic Resources and Crop Evolution DOI 10.1007/s10722-006-0018-0. II. Geleta, M., Bryngelsson, T., Bekele, E. & Dagne, K. Assessment of genetic diversity of Guizotia abyssinica (L.F.) Cass. (Asteraceae) from Ethiopia using Amplified Fragment Length Polymorphism (AFLP). Plant Genetic Resources. In press. III. Geleta, M., Bryngelsson, T., Bekele, E. & Dagne, K. AFLP and RAPD analyses of genetic diversity of wild and/or weedy Guizotia (Asteraceae) from Ethiopia. Hereditas DOI:10.1111/j.2007.0018-0661.01983.x. IV. Geleta, M., Bryngelsson, T., Bekele, E. & Dagne, K. 2007. Comparative analysis of genetic relationship and diagnostic markers of several taxa of Guizotia Cass. (Asteraceae) as revealed by AFLPs and RAPDs. Plant Systematics and Evolution DOI 10.1007/s00606-007-0521-6. In press. V. Bekele, E., Geleta, M., Dagne, K., Jones, A. L., Barnes, I., Bradman, N. & Thomas, M.G. 2006. Molecular phylogeny of genus Guizotia (Asteraceae) using DNA sequences derived from ITS. Genetic Resources and Crop Evolution DOI 10.1007/s10722-006-9126-0 VI. Geleta, M., Bryngelsson, T., Bekele, E. & Dagne, K. Molecular Phylogeny of the genus Guizotia (Asteraceae) based on sequences derived from the trnT/trnL and trnL/trnF intergenic spacers, trnL and 3’trnK/matK introns and matK gene. Submitted.
Place of Publication:SLU
ISBN for printed version:978-91-576-7326-8
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F30 Plant genetics and breeding
Subjects:Not in use, please see Agris categories
Agrovoc terms:guizotia, dna, nucleotide sequence, genetic variation, geographical distribution, genetic markers, phylogeny, geographical distrbution
Keywords:AFLP, cpDNA, DNA sequencing, genetic diversity, Guizotia, ITS, niger, phylogenetics, RAPD, systematics.
Permanent URL:
ID Code:1393
Department:(LTJ, LTV) > Department of Plant Protection Biology
Deposited By: Mulatu Geleta
Deposited On:16 Apr 2007 00:00
Metadata Last Modified:02 Dec 2014 10:11

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