Faculty of Science

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Browsing Faculty of Science by Subject "Acolpate"

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    Palynology of the Genus Stachytarpheta Vahl. (Verbenaceae)
    (2010) Adedeji, Olubukola
    The exine morphology of pollen grains of Stachytarpheta indica (Linn.) Vahl Stachytarpheta cayennensis (Rich.) Vahl and Stachytarpheta angustifolia (Mill.) Vahl is reported. This study was carried out with a light microscope. Pollen grains from fresh anthers were collected and aceolysed. Statistical analysis used to analyse the data collected include cluster analysis, correlation analysis, similarity and distance indices. The pollen grains are spheroidal to oblate to sub-oblate in shape. They are aperturate, both colpate and porate. Tricolpate types occur most frequently, acolpate, monocolpate, bicolpate and tetracolpate types less frequently. The rnulticolpate and multiporate attributes in all the species indicate that the genus is not primitive in evolutionary history and this species probably, evolved around in the same time. According to the size, the pollen grains of the genus falls into groups permagna (pollen diameter 100-200 υm) and giganta (pollen diameter greater than 200 υm). S. cayennensis and S. angustifolia belong to group perrnagna and S. indica only in the group giganta. This separates S. indica from the other two species. The large pollen grain size in the genus clearly supports the fact that the flowers in the genus are more insect-and-bird pollinated than wind pollinated. The similarity and distance indices of the species showed that S. cayennensis and S. angustifolia are the closest. S. indica is closer to S. angustifolia but farther from S. cayennensis.
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    Pollen Morphology of the Three Species of the Genus Emilia CASS. (Asteraceae) from Nigeria
    (2005) Adedeji, O.
    The structural morphology of the pollen grains of the three species of Emilia occurring in Nigeria is reported. The report is based on the study carried out with a light microscope on acetolysed pollen grains. Observations from this investigation show that E. coccinea with more acolpate and monocolpate pollen grains is the most primitive out of the three species studied. Tetracolpate pollen grain which is an advanced type of pollen grain was observed in E. praetermissa alone affirming that this taxon is more advanced than the other two taxa investigated. So based on this study, the order E.coccinea followed by E. sonchifolia followed by E. praetemissa in ascending order of recent evolutionary development is strongly affirmed. Moreover out of all the pollen -grain attributes statistically analysed, number of pores on the pollen grains is an attribute that can be used effectively and reliably to separate, delimit and classify the species of Ernilia.