Investigation of pollen competition between wild and cultivated sorghums (Sorghum bicolor (L.) Moench) using simple sequence repeats markers

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dc.contributor.authorMuraya, Moses M.
dc.contributor.authorGeiger, Hartwig H.
dc.contributor.authorde Villiers, Santie
dc.contributor.authorSagnard, Fabrice
dc.contributor.authorKanyenji, Ben M.
dc.contributor.authorKiambi, Dan
dc.contributor.authorParzies, Heiko K.
dc.date.accessioned2024-03-15T15:52:06Z
dc.date.available2017-01-24T06:48:50Z
dc.date.available2024-03-14T12:31:05Z
dc.date.available2024-03-15T15:52:06Z
dc.date.issued2017-01-24
dc.description.abstractIn self-compatible plant species stigmata receive a mixture of self and outcrossed pollen and competition between them is expected to play a major role in determining the pollen-mediated gene flow. The use of male sterile bait plants in field trials to demonstrate the rate of gene flow is questionable due to lack of pollination competition. However, little direct evidence has been published. A field experiment of male sterile and male fertile sorghum pollen recipient bait plants was conducted to evaluate pollen competition between wild and cultivated sorghums and the effects of pollen competition on gene flow assessment. Pollen competition between wild and cultivated sorghums was estimated from two-component pollen mixtures of wild and cultivated sorghum (1:1 ratio) applied to wild, cultivated and male-sterile maternal bait plants. Paternity was determined in the progeny using the diagnostic. Simple Sequence Repeat markers. The study found that self pollen has higher seed-siring success. Maternal genotype influences the siring ability of the pollen donor components which significantly deviated from the 1:1 pollen loads. The study showed that published estimates of gene flow derived from studies using male-sterile bait plants seriously overestimate gene flow and that pollen competition may be a significant factor influencing outcrossing rates.The results suggest tha tthe predominant direction of gene flow is from cultivated to wild sorghum, potentially leading to introgression of crop genes into wild sorghum. Pollen competition should be taken into account in gene flow estimation, since presence of self-pollen can account for over half of seed produced irrespective of maternal genotype.
dc.description.sponsorshipPAC University
dc.identifier.urihttps://repo.pacuniversity.ac.ke/handle/123456789/1037.3
dc.language.isoen
dc.subjectSorghum bicoloren_US
dc.subjectPollen competitionen_US
dc.subjectOutcross pollenen_US
dc.subjectSelf pollenen_US
dc.subjectPollinationen_US
dc.subjectPollen-mediated gene flowen_US
dc.titleInvestigation of pollen competition between wild and cultivated sorghums (Sorghum bicolor (L.) Moench) using simple sequence repeats markersen_US
dc.typeArticle
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