Gross morphology and leaf anatomical characterization of nine wild species of rice.

Date

4-2005

Degree

Bachelor of Science in Biology

Major Course

Major in Cell Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Nerissa K. Torreta

Abstract

The gross morphology and leaf morpho-anatomical features of nine wild species of rice namely: Oryza alla, 0. longistaminata, O. rufipogon, O. minuta, O. ridleyi, Rhynchoryza suhulata, Ilpionhyeo japonica, Porteresia coarctata, and Ma-Hae, were compared and screened for possible C4 leaf anatomical characters. O. longistaminata and O. alta differed from O. minuta, 0. ridleyi, and Ma-Hae in terms of height, leaf and stem lengths. I. japonica appears to be very short in height and leaf length. Patterns in laminar vascular bundle and fibrovascular bundle arrangement can be seen. Most species possess 4-6 fibrovascular bundles in between their vascular bundles. The wild rice species have evident midribs except P. coarctata. Their midribs are more diverse than their laminas. The midribs of 0. longistaminata, O. rufipogon, and R. subulata have numerous vascular bundles (8-10). The midribs of these three species are made up mostly of aerenchyma cells. 0. alta, O. minuta, and O. ridleyi have midribs with only one vascular bundle and 2-3 fibrovascular bundles. Their midribs were mostly parenchymatous and only a small portion was made up of aerenchyma cells. I. japonica, Ma-Hae and P. coarctata had features unique from the other species. I. japonica had only one vascular bundle like O. alta, 0. minuta, and O. ridleyi but its midrib is composed mainly of aerenchyma cells. Ma-Hae was the only one showing three vascular bundles in its midrib. P. coarctata showed no obvious midrib but its middle part had a vascular bundle-fibrovascular bundle arrangement unique from the rest of the leaf. Based on the leaf characterization, C4 features (Krantz anatomy) were not seen in any of the wild rice varieties. Light microscopy revealed the absence of chloroplasts in the bundle sheath cells. It is recommended that other parameters for assessing C4 characteristics like photosynthetic rate determination or analysis for organic compounds associated with the C4 pathway be assessed to establish if the C4 pathway exists in these wild rice varieties.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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