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Hu K.-D.,Hefei University of Technology | Tang J.,Xuzhou Sweet Potato Research Center | Zhao D.-L.,Xuzhou Sweet Potato Research Center | Hu L.-Y.,Hefei University of Technology | And 4 more authors.
Biologia Plantarum | Year: 2014

Sulfur dioxide (SO2) is a well-known and widespread air pollutant but it also acts as signaling molecule in various processes in animals. However, there is limited information on the role of SO2 in plants except of its toxicity. Here we studied the role of SO2 on stomatal movements in sweet potato (Ipomoea batatas) leaves. SO2, generated by Na2SO3/NaHSO3 solutions, was applied on epidermal strips. We found that the SO2 donor induced stomatal closure in a dose-dependent manner. Rapid increases in endogenous hydrogen sulfide and nitric oxide content levels were observed in leaves after the treatment with the SO2 donor. The SO2-induced stomatal closure was reversed by the H2S scavenger hypotaurine and the NO-specific scavenger cPTIO. Our results indicate that the SO2-induced stomatal closure was likely mediated by the H2S and NO signaling pathways. © 2014, Springer Science+Business Media Dordrecht.

Tang J.,Xuzhou Sweet Potato Research Center | Hu K.-D.,Hefei University of Technology | Hu L.-Y.,Hefei University of Technology | Li Y.-H.,Hefei University of Technology | And 2 more authors.
HortScience | Year: 2014

Hydrogen sulfide (H2S) has been shown to be a gaseous molecule in the regulation of many processes in plants such as abiotic stress tolerance, root organogenesis, stomatal movement, and postharvest fruit senescence. We studied the role of H2S in the regulation of senescence and fungal decay in fresh-cut sweetpotato (Ipomoea batatas L., cv. Xushu 18) roots. H2S donor sodium hydrosulfide (NaHS) alleviated senescence in fresh-cut sweetpotato root tissue in a dose-dependent manner with the optimal concentration of 2.0 mmol·L-1 NaHS solution. At the optimal concentration of 2.0 mmol·L-1 NaHS, H2S fumigation maintained higher levels of reducing sugar in sweetpotato fresh-cut root. H2S treatment also significantly increased the activities of guaiacol peroxidase (POD) and decreased those of polyphenol oxidase (PPO) in sweetpotato during storage. Further investigation showed that H2S treatment maintained a lower level of lipoxygenase (LOX) activity compared with water control. Consistently, the accumulation of malondialdehyde (MDA) was reduced in H2S-treated groups. Three fungal pathogens, Rhizopus nigricans, Mucor rouxianus, and Geotrichum candidum, were isolated from sweetpotato tissue infected with black rot or soft rot. H2S fumigation at 1 to 2.5 mmol·L-1 NaHS resulted in effective inhibition of the three fungi when grown on medium. When the three fungi were inoculated on the surface of sweetpotato slices, H2S fumigation greatly reduced the percentage of fungal infection. In conclusion, these data suggest that H2S effectively alleviated the senescence and decay in sweetpotato slices and might be developed into a novel fungicide for reduction of black rot or soft rot in sweetpotato.

Xu Z.,Xuzhou Sweet Potato Research Center | Zhao Y.-Q.,Xuzhou Sweet Potato Research Center | Yang D.-J.,Xuzhou Sweet Potato Research Center | Sun H.-J.,Xuzhou Sweet Potato Research Center | And 2 more authors.
Nematology | Year: 2015

Potato rot nematode (Ditylenchus destructor) is one of the most damaging pests of sweet potato in the northern region of China. Glasshouse and field experiments were conducted to explore the main invasion route used by potato rot nematodes during infection of sweet potato plants. The nematode's host location behaviour was also investigated. Results suggested that substantial yield losses of sweet potato caused by D. destructor parasitism depend upon the existence of wounds on seedling roots. Therefore, reducing the number of nematodes that invade through such wounds would be an effective control method. We found that root exudates and extracts from underground stems of both resistant (cv. Zhenghong 22) and susceptible (cv. Lizixiang) sweet potato cultivars attracted potato rot nematodes. In addition, a strong repellent effect of latex against these nematodes was observed in both cultivars. Interestingly, octadecyl-(Z)-p-coumarate, a component of sweet potato latex, acted as a repellent for potato rot nematodes, while hexadecyl- and eicosyl-(Z)-p-coumarates did not. These findings provide a basis for understanding the mechanism underlying the host location behaviour of potato rot nematodes and can help in designing new nematode control methods. © 2015 Koninklijke Brill NV, Leiden.

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