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Wild sorghum from different eco-geographic regions of Kenya display a mixed mating system

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Relation http://oar.icrisat.org/49/
http://dx.doi.org/10.1007/s00122-011-1560-5
 
Title Wild sorghum from different eco-geographic regions of Kenya display a mixed mating system
 
Creator Muraya, M M
Mutegi, E
Geiger, H H
de Villiers, S M
Sagnard, F
Kanyenji, B M
Kiambi, D
Parzies, H K
 
Subject Sorghum
 
Description 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.
 
Publisher Springer Verlag
 
Date 2011
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/49/1/TAG_122_8_1631-1639_2011.pdf
Muraya, M M and Mutegi, E and Geiger, H H and de Villiers, S M and Sagnard, F and Kanyenji, B M and Kiambi, D and Parzies, H K (2011) Wild sorghum from different eco-geographic regions of Kenya display a mixed mating system. Theoretical and Applied Genetics, 122 (8). pp. 1631-1639. ISSN 0040-5752