Abstract
The effect of duckweed species composition (Lemna aequinoctialis 5505, Landoltia punctata 5506 and Spirodela polyrhiza 5507) in polyculture and monoculture on biomass and starch/protein content were investigated at different levels of temperature, light intensity, nitrogen and phosphorus concentrations. The three growth parameters significantly affect duckweed biomass accumulation. Different combinations of duckweed species greatly varied in starch/protein content. Although all the polycultures showed a median relative growth rate and the majority of the polycultures showed a median and starch/protein content as compared with their respective monocultures, some of the polycultures were found to promote the accumulation of starch/protein at different growth conditions. These findings indicated that proper combination of duckweed species could facilitate desirable biomass accumulation and improve biomass quality. The present study provides useful references for future large-scale duckweed cultivation.
Highlights
The Lemnaceae is an aquatic plant that has shown considerable potential in wastewater treatment [1,2]
Depending on duckweed species and cultivation conditions, the starch contents of duckweed can vary from 3 % to 75 % of dry weight, while the protein contents from 15 % to
The relative growth rate, starch content and protein content of duckweed isolates in polyculture or monoculture were investigated under three different parameters using one-tenth strength of Hoagland solution
Summary
The Lemnaceae (commonly called duckweed) is an aquatic plant that has shown considerable potential in wastewater treatment [1,2]. Duckweed can assimilate nutrients from wastewater and convert them into valuable biomass, primarily composed of starch and protein [3,4]. By extrapolating from field-study results, biomass yields of 39.1–105.9 t · ha − 1 · year − 1 (dry biomass) could be achieved for duckweed using wastewater as a nutrient source, exhibiting substantially higher yields than most other potential energy crops [2,6]. Depending on duckweed species and cultivation conditions, the starch contents of duckweed can vary from 3 % to 75 % of dry weight, while the protein contents from 15 % to
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