Comparative Anatomy and Systemeatics Investigation of Oryza Species in Nigeria

Authors : Idio, Emmanuel R" Jayeola, Adeniy

Volume/Issue : Volume 5 - 2020, Issue 3 - March

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Anatomical work was carried out on five species of Oryza in Nigeria using standard anatomical procedures. The wild and the cultivated species are morphologically similar and difficult to distinguish one from the other during the vegetative stage. Thus, it becomes important to look for additional anatomical microcharacters for ease of identification of these spp. even at the vegetative stage. The results showed that while the awn, culm and root of the five Oryza species have the same fundamental anatomical structure, there were clear specific differences in the details of the patterns observed. The awn of O. barthii and O. longistaminata derived strength and rigidity from copious fibre cells while O. punctata derived its strength from a mass of highly lignified parenchyma cells. The arrangement of ground tissue, vascular bundle in the awn, culm and root differs among species. While the Oryza species are similar morphologically, there are clear, stable, specific level diagnostic anatomical characteristics useful in separating them at the vegetative stage. The absence of awn in the cultivated Oryza sativa is indicative of a more derived condition over the wild Oryza species and the occurrence of net venation in the wild species points to a less derived condition.


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