Effects of selenite on chlorophyll fluorescence, starch content and fatty acid in the duckweed Landoltia punctata
2016
Zhong, Y. (Peking University-Shenzhen Graduate School, Shenzhen (China). School of Environment and Energy) | Li, Y. | Cheng, J.J.
Developing a Se-enriched feed for animal has become a considerable effort. In this study, Landoltia punctata 7449 was grown over a 12 day period under concentrations of selenite (Na2SeO3) from 0 to 80 micro mol /L. The growth rate, the chlorophyll fluorescence, the starch content and fatty acid were measured. Se at low concentrations of <=20 micro mol /L had positive effects also on growth rate, fatty acid content and yield of the L. punctata. The appropriate Se treatment enhanced the activity of the photosynthetic system by increasing Fv, Fm, Fv/Fm and Fv/Fo and decreasing Fo. However, negative impact to the L. punctata was observed when the duckweed was exposed to high Se concentrations (>=40 micro mol /L). Significant increases in starch content in the duckweed were observed after Se application. The present study suggests that the changes in growth rate, the photosynthetic system, the starch content and the fatty acid were closely associated with the application of Se. An increased Se concentration (0-20 micro mol /L) in duckweed could positively induce photosynthesis, thereby increasing the yield of L. punctata and could be a resource for high nutritive quality Se-enrich feed.
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