Wild sorghum from different eco-geographic regions of Kenya display a mixed mating system |
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Authors: | Moses M Muraya Evans Mutegi Hartwig H Geiger Santie M de Villiers Fabrice Sagnard Ben M Kanyenji Dan Kiambi Heiko K Parzies |
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Institution: | 1.Leibniz Institute of Plant Genetics and Crop Plant Research,Gatersleben,Germany;2.Institute of Plant Breeding, Seed Science and Population Genetics,University of Hohenheim,Stuttgart,Germany;3.CIRAD, UMR Développement et Amélioration des Plantes,Nairobi,Kenya;4.International Crops Research Institute for the Semi-Arid Tropics (ICRISAT-Nairobi),Nairobi,Kenya;5.Kenya Agricultural Research Institute (KARI) National Genebank,Nairobi,Kenya;6.Kenya Agricultural Research Institute (KARI-Embu),Embu,Kenya |
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Abstract: | Knowledge of mating systems is required in order to understand the genetic composition and evolutionary potential of plant
populations. Outcrossing in a population may co-vary with the ecological and historical factors influencing it. However, literature
on the outcrossing rate is limited in terms of wild sorghum species coverage and eco-geographic reference. This study investigated
the outcrossing rates in wild sorghum populations from different ecological conditions of Kenya. Twelve wild sorghum populations
were collected in four sorghum growing regions. Twenty-four individuals per population were genotyped using six polymorphic
simple sequence repeat (SSR) markers to compute their indirect equilibrium estimates of outcrossing rate as well as population
structure. In addition, the 12 populations were planted in a field in a randomised block design with five replications. Their
progeny (250 individuals per population) were genotyped with the six SSR markers to estimate multi-locus outcrossing rates.
Equilibrium estimates of outcrossing rates ranged from 7.0 to 75.0%, while multi-locus outcrossing rates (t
m) ranged from 8.9 to 70.0% with a mean of 49.7%, indicating that wild sorghum exhibits a mixed mating system. The wide range
of estimated outcrossing rates in wild sorghum populations indicate that environmental conditions may exist under which fitness
is favoured by outcrossing and others under which selfing is more advantageous. The genetic structure of the populations studied
is concordant with that expected for a species displaying mixed mating system. |
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