PLANT GROWTH PROMOTING ACTIVITY OF Peanibacillus sp. BSR1-1 AND NAPHTHALENE ACETIC ACID TOWARD Spirodela polyrrhiza CULTIVATED IN CADMIUM AND TRITON X-100 CONTAMINATED WATER
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Abstract
The objective of this study was to evaluate the effects of two auxins; indole-3-acetic acid (IAA) produced by Peanibacillus sp. BSR1-1 and naphthalene acetic acid (NAA) on the growth stimulation of duckweed in water co-contaminated with Triton X-100 and cadmium. It was found that two types of plant growth regulators were NAA and bacterial culture filtrate of Peanibacillus sp. BSR1-1, was unable to increase the biomass and chlorophyll content of the duckweed when compared with treatment without plant growth regulator. However, when comparing treatments with equal growth regulators, exposure to NAA or bacterial culture filtrate of Peanibacillus sp. BSR1-1 resulted in the total chlorophyll A and chlorophyll content in cadmium-containing treatments trended to be higher than those without cadmium. With these results, NAA and bacterial culture filtrated of Peanibacillus sp. BSR1-1 is not appropriate to increase plant growth in cadmium and surfactant co-contaminated water. Therefore, other synthetic auxins or cadmium tolerant- and IAA producing microorganisms should be used instead.
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References
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