Little information is available on the interaction of CuO nanoparticles (nCuO) with tuberous roots. In this study, Beauregard-14 (B-14, low lignin) and Covington (COV, high lignin) sweetpotato varieties were cultivated until maturity in soil amended with nCuO, bulk copper oxide (bCuO) and CuCl2 at 25–125 mg/kg. The Cu treatments had no significant influence on chlorophyll content. Gas exchange parameters were not affected in B-14. In COV, however, at 125 mg/kg treatments, bCuO reduced the intercellular CO2 (11%), while CuCl2 increased it by 7%, compared with control (p ≤ 0.035). At 25 mg/kg nCuO increased the length of COV roots (20.7 ± 2.0 cm vs. 14.6 ± 0.8 cm, p ≤ 0.05). In periderm of B-14, nCuO, at 125 mg/kg, increased Mg by 232%, while the equivalent concentration of CuCl2 reduced P by 410%, compared with control (p ≤ 0.05). The data suggest the potential application of nCuO as nanofertilizer for sweetpotato storage root production.

关于CuO纳米颗粒（nCuO）与块根的相互作用的信息很少。在这项研究中，培育了Beauregard-14（B-14，低木质素）和Covington（COV，高木质素）甘薯品种，直到土壤中成熟的nCuO，块状氧化铜（bCuO）和CuCl2修正为25–125 mg / kg 。铜处理对叶绿素含量无显着影响。气体交换参数在B-14中不受影响。然而，在COV中，以125 mg / kg的剂量处理，与对照组相比，bCuO减少了细胞间的CO2（11％），而CuCl2则增加了7％（p≤0.035）。在25 mg / kg nCuO下，COV根的长度增加（20.7±2.0 cm对14.6±0.8 cm，p≤0.05）。与对照相比，在B-14的外皮中，125 mg / kg的nCuO可使Mg增加232％，而当量的CuCl2可使P减少410％（p≤0.05）。