The effects of varietal differences in the response of plants to nanomaterial exposure are not well understood yet. In this study, two bok choy (Brassica rapa) varieties Rosie (high anthocyanin content) and Green (low anthocyanin content) were exposed for to nano CuO, bulk CuO and ion CuSO4 at 0, 75, 150, 300 and 600 mg/kg until fully mature stage. The presence of nano CuO in bok choy leaves was demonstrated by Two-photon Microscopy. Nano and bulk CuO treatments at all concentrations significantly increased the uptake Cu in roots (645-4663%，217-2227%) and leaves (1112-2221%, 522-2222%) of both bok choy varieties, compared with each control. Leaves fresh weight and dry weight, plant height, foliar area and chlorophyll contents of both Rosie and Green were significantly decreased by all the three types of Cu based compounds (p &lt; 0.05). The evaluation showed that roots accumulated more Cu than leaves, and Rosie root had more Cu uptake than Green ones. The potential uptake pathway was proved by two-photon microscope images. As a result, Cu based compounds inhibited the growth of Rosie more than Green, and nano CuO affected plant development most compared to the other two Cu based compounds at the same exposed concentrations.

Effect of nano and bulk copper oxide particles on the development of two varieties of bok choy (<i>Brassica rapa</i>) plants

2019 Fall National Meeting

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Effect of nano and bulk copper oxide particles on the development of two varieties of bok choy (Brassica rapa) plants