Azolla as biological scavenger of geothermal ions: 1. propagation and characterization of selected azolla variants
1993
Payawal, P.C. | de Macale, M.A.R. | Lales, J.S. | Querubin, L.J. (Philippines Univ., Los Banos, College, Laguna (Philippines). Inst. of Biological Sciences)
Based on the parameters observed such as doubling time, heterocyst index, chlorophyll content, root number and root length, Azolla filiculoides 1042 and Azolla hybrids UPLB 2 sub 7 proved to be adaptable as biological agent to purify geothermal effluent of heavy metal contamination. A greenhouse experiment was made to evaluate the performance of six azolla salt tolerant hybrids and one azolla strain under increasing concentrations of geothermal effluent. The objective was to identify azolla which could perform better at higher geothermal effluent concentrations, at the same time, is efficient in absorbing geothermal ions. Based on the parameters observed such as doubling time, heterocyst index, chlorophyll content, root number and root length, A. filiculoides 1042 and Azolla hybrid UPLB 2 sub 7 proved to be adaptable as biological agent to purify geothermal effluent of heavy metal contamination. A. filiculoides 1042 exhibited the fastest doubling time rate at all concentrations of geothermal effluent. Results suggest that the plants could be harvested every 7 days when grown in 75% geothermal effluent and every 15 days when planted in 100% effluent concentration. Moreover, its heterocyst index was not significantly affected at higher effluent concentrations. On the other hand, among the azolla hybrids tested, UPLB 2 sub 7 has the shortest growth rate at 50% and 75% effluent concentrations (10 and 19 days, respectively). In addition, it has significantly higher root number in treatments with geothermal effluent
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