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Effects of reactive oxygen species on UV-B-induced ethylene production in leaves of maize seedlings

Effects of reactive oxygen species on UV-B-induced ethylene production in leaves of maize seedlings

Zhiwu Shengtai Xuebao 31(5): 946-951

Aims Ethylene accumulation and oxidative stress are two common responses of plants to environmental stresses; however, little is known about their relationships. Our objective was to investigate the role of reactive oxygen species (ROS) in ethylene synthesis induced by UV-B radiation (280 - 320 mn) in leaves of maize (Zea mays).Methods Lamps were suspended above and perpendicular to the plastic trays and filtered with 0. 13-mm thick cellulose diacetate (transmission down to 290 nm) for UV-B irradiance. The desired UV-B irradiation was obtained by changing the distance between the lamps and the plastic trays. The levels of UV-B irradiation were 4.8 kJ.m(-2) .d(-1).Important findings UV-B radiation led to the generation of ROS and ethylene. The accumulation of ethylene induced by UV-B was not only inhibited by the scavengers of ROS, but also by aminoxyacetic acid (AOA) and 2-aminoethoxyvinlglycine (AVG), which are specific inhibitors of ethylene synthesis. The inhibition effect of ROS scavengers on UV-B-induced ethylene production was reversed by O-2(-) donors. Results indicated that the increase in ethylene production may not be the cause of the increase in ROS production under UV-B stress. In contrast, the increase of ROS led to the accumulation of ethylene. Results suggested that ROS are involved in UV-B stress-induced ethylene accumulation. The accumulation of UV-B-induced ethylene was not affected by DPI, an inhibitor of NADPH oxidase and CAT, a specific scavenger of H2O2. Results suggested that the effect of H2O2 on UV-B-induced ethylene production in leaves of maize seedlings can be excluded, O-2(-) plays an important role in UV-B-induced ethylene synthesis in leaves of maize seedlings and O-2(-) serves as a potential mediator of ethylene production that the plant can sense the UV-B stress. The related ROS are not from plasma membrane NADPH oxidase. The source of ROS contributing to ethylene accumulation under IN-B stress is unknown.

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Accession: 018813895

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