Abstract
IMPACT OF HERBICIDES ON CHLOROPHYLL-A, ?-CAROTENE, PHYCOCYANIN AND ALLOPHYCOCYANIN SUBSTANCE OF NOSTOC MUSCORUM L.

*Komala E.

ABSTRACT

Continual increases within the human population and growing concerns associated with the energy crisis, food security, disease outbreaks, global warming, and other environmental issues require a sustainable solution from nature. One among the promising resources is cyanobacteria, also called blue green algae. They require simple ingredients to grow and possess a comparatively simple genome. Cyanobacteria are known to supply a large style of bioactive compounds. Pigments are frequently employed in medicine, food, pharmacology, cosmetics, ink, and textile preparations. Cyanobacteria have an excellent potential to be used as pigment producers because they're easy to grow with simple nutrient requirements, unlike other microbial systems, and additionally, have an outsized number of pigments. Cyanobacteria produce some pigments like chlorophyll-a, carotenoids, phycobiliproteins. Additionally, cyanobacteria can fix free atmospheric nitrogen. Environmental conditions affect cyanobacterial growth and pigment production. Herbicides use commonly in paddy fields. Because of this, herbicides can affect to non-target microorganisms such as cyanobacteria. In this study, production of some pigments by Nostoc muscorum were studied using different herbicides in BG-11 medium. As herbicide, cyhalofop- butyl and fenoxaprop-p-ethyl used in this study. In this work, different herbicide concentrations were applied on pigment production. Initial fenoxaprop-p-ethyl concentrations (10.0, 20.0, and 30.0 mg/L) stimulated chlorophyll-a, β- caroten, phycocyanin and allophycocyanin contents. But increasing herbicide concentrations suppressed to the all of pigment contents. The all of pigment contents of Nostoc muscorum completely suppressed by 500 mg/L fenoxaprop-p-ethyl concentration. The other herbicide is cyhalofop-butyl. Initial cyhalofop-butyl concentrations partly stimulated the pigment contents. But, the pigment contents of Nostoc muscorum increased sharply by 30 mg/L cyhalofop-butyl concentrations. The all of pigment contents of Nostoc muscorum completely repressed by 500 mg/L cyhalofop-butyl concentrations.

Keywords: Nostoc muscorum, chlorophyll-a, ?- caroten, phycocyanin, allophycocyanin, herbicid, and cyhalofop- butyl and fenoxaprop-p-ethyl.


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