Authors :
Idio, Emmanuel R" Jayeola, Adeniy
Volume/Issue :
Volume 5 - 2020, Issue 3 - March
Google Scholar :
https://goo.gl/DF9R4u
Scribd :
https://bit.ly/3aBtBcf
Abstract :
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.
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.
