Assessment of genetic diversity among African cassava Manihot esculenta Grantz accessions resistant to the cassava mosaic virus disease using SSR markers
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Lokko, Y., Dixon, A., Offei, S., Danquah, E. & Fregene, M. (2006). Assessment of genetic diversity among African cassava Manihot esculenta Grantz accessions resistant to the cassava mosaic virus disease using SSR markers. Genetic Resources and Crop Evolution, 53(7), 1441-1453.
Permanent link to cite or share this item: http://hdl.handle.net/10568/91367
A study was conducted to determine the extent of genetic diversity among African cassava (Manihot esculenta Crantz) accessions resistant to the cassava mosaic virus disease (CMD), using simple sequence repeat (SSR) markers. The accessions included a breeding stock (clone 58308), five improved lines, 62 CMD resistant and 10 CMD susceptible landraces. Genetic diversity was assessed among accessions in five cluster groups derived from UPGMA analysis on data from 18 SSR primer pairs. Average gene diversity, He, was high in all cluster groups, with an average heterozygosity of 0.591 ± 0.061. The estimator of inbreeding Fis revealed a low level of inbreeding within groups and averaged −0.262 ± 0.142. Gene diversity among all accessions was 51.4% and gene diversity within cluster groups was 46.6%, while 4.8% was due to diversity between the different cluster groups. The amount of genetic differentiation measured by Gst and Fst were 9.6% and 12.1% respectively, indicating a weak genetic structure.
SubjectsPLANT GENETIC RESOURCES; DISEASE CONTROL; FARM MANAGEMENT; PESTS OF PLANTS; PLANT BREEDING; LIVELIHOODS; CASSAVA; GENETIC IMPROVEMENT; FARMING SYSTEMS; HANDLING, TRANSPORT, STORAGE AND PROTECTION OF AGRICULTURAL PRODUCTS; PLANT DISEASES; PLANT HEALTH; PLANT PRODUCTION
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