Abstract
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 nm) 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 UV-B stress is unknown.
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Claims 9
Claim · model-written summary
UV-B generated ROS and ethylene in maize leaves.
Zea maysNot reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UV-B radiation led to the generation of ROS and ethylene”
t0“MAIZE”
Claim · model-written summary
ROS scavengers inhibited UV-B-induced ethylene accumulation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“MAIZE”
e0“The accumulation of ethylene induced by UV-B was not only inhibited by the scavengers of ROS”
Claim · model-written summary
AOA inhibited UV-B-induced ethylene accumulation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“MAIZE”
e0“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)”
Claim · model-written summary
AVG inhibited UV-B-induced ethylene accumulation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“MAIZE”
e0“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)”
Claim · model-written summary
O-·2 donors reversed ROS-scavenger inhibition of ethylene production.
- Treatment
- O-·2 donorse0
- Outcome
- UV-B-induced ethylene productione0
- Direction
- reversede0
- Comparator
- ROS scavengerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“MAIZE”
e0“The inhibition effect of ROS scavengers on UV-B-induced ethylene production was reversed by O-·2 donors”
Claim · model-written summary
DPI did not affect UV-B-induced ethylene accumulation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“MAIZE”
e0“The accumulation of UV-B-induced ethylene was not affected by DPI”
Claim · model-written summary
CAT did not affect UV-B-induced ethylene accumulation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“MAIZE”
e0“The accumulation of UV-B-induced ethylene was not affected by DPI,an inhibitor of NADPH oxidase and CAT,a specific scavenger of H2O2”
Claim · model-written summary
The authors infer superoxide mediates UV-B-induced ethylene synthesis.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“MAIZE”
e0“O-·2 plays an important role in UV-B-induced ethylene synthesis in leaves of maize seedlings”
Claim · model-written summary
The authors infer the relevant ROS do not come from plasma membrane NADPH oxidase.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“MAIZE”
e0“The related ROS are not from plasma membrane NADPH oxidase”
The same questions in other papers
reactive oxygen species · physiology: hormones · Zea mays (maize)Results agree
1 paper in the same direction as this paper
- no effect
uv · physiology: oxidative · Zea mays (maize)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.