Allium test as an indicator of water pollution in the rivers and creeks of Iligan City [Philippines]
1998
Kenady, D.C.C.
The allium test, an alternative first-tier assay system for toxicity testing and environmental monitoring was tried on April 15 to June 4, 1997 to indicate water pollution in Tubod River, Mandulog River, Agus River, and Baslayan Creek, all in Iligan City, through macroscopic and microscopic responses of onion roots. Results of the tests were compared with the control. Tubod River and Baslayan Creek waters, particularly in the downstream samples, inhibit root growth which is a positive response of the allium test and indicated further that the tested waters were polluted. However, in Mandulog and Agus Rivers, the root growth responses of Allium were similar to that of the control and showed that there were no chromosomal abberations observed in all the samples which implieS that there were no mutagenic substances present in the rivers. Using the results on the macroscopic responses on the allium test conducted in Tubod River, Mandulog River, Agus River, and Baslayan Creek, an inquiry teaching materials was developed and tested from Oct 20-22, 1997 to the second year Biology students of the Integrated Developmental School, MSU-IIT, Iligan City. Students were required to intrepret graphical and tabular data and drew conclusions. The responses were recorded and later transcribed and assessed; interpretation of data and conclusions were similar to that of the researcher
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