Issues concerning reproductive isolation in a rice hybrid swarm involving Oryza sativa Linn., O. longistaminata A. Chev. et Roehr. and Oryza glaberrima Steud. located in Jebba Nigeria
A hybrid swarm involving O. sativa, O. glaberrima and O. longistaminata occuring in Jebba, Nigeria was studied to investigate the processes involved in the population dynamics. Reproductive parameters such as pollen stainability, pollen size, anther structure, seed set were investigated. The chromosomes of the hybrid population were also studied. The study reveals post-zygotic mechanism involving segregational as well as developmental hybrid sterility to be the major isolating mechanism involved the reproductive isolation existing among the parent populations in the swarm. Hybridization and introgression have played significant roles in creating this hybrid swarm which holds a lot of promise for speciation in the genus.
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Keywords: Rice swarm, population dynamics, hybrid sterility, isolating mechanism, introgression.
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