Abstract
The antagonism between abscisic acid (ABA) and gibberellin (GA) plays a key role in controlling seed germination, but the mechanism of antagonism during this process is not known. The possible links among ABA, reactive oxygen species (ROS), ascorbic acid (ASC), and GA during rice seed germination were investigated. Unlike in non-seed tissues where ROS production is increased by ABA, ABA reduced ROS production in imbibed rice seeds, especially in the embryo region. Such reduced ROS also led to an inhibition of ASC production. GA accumulation was also suppressed by a reduced ROS and ASC level, which was indicated by the inhibited expression of GA biosynthesis genes, amylase genes, and enzyme activity. Application of exogenous ASC can partially rescue seed germination from ABA treatment. Production of ASC, which acts as a substrate in GA biosynthesis, was significantly inhibited by lycorine which thus suppressed the accumulation of GA. Consequently, expression of GA biosynthesis genes was suppressed by the low levels of ROS and ASC in ABA-treated seeds. It can be concluded that ABA regulates seed germination in multiple dimensions. ROS and ASC are involved in its inhibition of GA biosynthesis.
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Claims 9
Claim · model-written summary
ABA reduced ROS production in imbibed rice seeds, especially in the embryo region.
- Taxon
- rice
Oryza sativat0 - Organ / stage
- embryo regione1
- Treatment
- ABAe1
- Outcome
- ROS productione1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice seeds”
e1“ABA reduced ROS production in imbibed rice seeds, especially in the embryo region”
Claim · model-written summary
Reduced ROS led to inhibition of ascorbic acid production in rice seeds.
- Taxon
- riceOryza sativat0
- Compound
- ROSe2
- Outcome
- ASC productione2
- Direction
- decreaseinferrede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice seeds”
e2“Such reduced ROS also led to an inhibition of ASC production”
Claim · model-written summary
GA accumulation was suppressed by reduced ROS and ASC levels in rice seeds.
- Taxon
- riceOryza sativat0
- Compound
- ROS and ASCe3
- Outcome
- GA accumulatione3
- Direction
- suppressede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice seeds”
e3“GA accumulation was also suppressed by a reduced ROS and ASC level, which was indicated by the inhibited expression of GA biosynthesis genes, amylase genes, and enzyme activity”
Claim · model-written summary
Expression of GA biosynthesis genes and amylase genes was inhibited by reduced ROS and ASC levels in rice seeds.
- Taxon
- riceOryza sativat0
- Gene
- GA biosynthesis genes, amylase genese3
- Compound
- ROS and ASCe3
- Outcome
- expressione3
- Direction
- inhibitede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice seeds”
e3“GA accumulation was also suppressed by a reduced ROS and ASC level, which was indicated by the inhibited expression of GA biosynthesis genes, amylase genes, and enzyme activity”
Claim · model-written summary
Enzyme activity was inhibited by reduced ROS and ASC levels in rice seeds.
- Taxon
- riceOryza sativat0
- Compound
- ROS and ASCe3
- Outcome
- enzyme activitye3
- Direction
- inhibitede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice seeds”
e3“GA accumulation was also suppressed by a reduced ROS and ASC level, which was indicated by the inhibited expression of GA biosynthesis genes, amylase genes, and enzyme activity”
Claim · model-written summary
Exogenous ascorbic acid partially rescued seed germination in rice seeds treated with ABA.
- Taxon
- riceOryza sativat0
- Treatment
- exogenous ASCe4
- Outcome
- seed germinatione4
- Direction
- partially rescuee4
- Comparator
- ABA treatmente4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice seeds”
e4“Application of exogenous ASC can partially rescue seed germination from ABA treatment”
Claim · model-written summary
Lycorine significantly inhibited ASC production in rice seeds.
- Taxon
- riceOryza sativat0
- Treatment
- lycorinee5
- Outcome
- Production of ASCe5
- Direction
- significantly inhibitede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice seeds”
e5“Production of ASC, which acts as a substrate in GA biosynthesis, was significantly inhibited by lycorine which thus suppressed the accumulation of GA”
Claim · model-written summary
Lycorine suppressed GA accumulation in rice seeds.
- Taxon
- riceOryza sativat0
- Treatment
- lycorinee5
- Outcome
- accumulation of GAe5
- Direction
- suppressede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice seeds”
e5“Production of ASC, which acts as a substrate in GA biosynthesis, was significantly inhibited by lycorine which thus suppressed the accumulation of GA”
Claim · model-written summary
ROS and ascorbic acid may be involved in the inhibition of GA biosynthesis by ABA in rice seeds.
- Taxon
- riceOryza sativat0
- Compound
- ROS and ASCe7
- Outcome
- inhibition of GA biosynthesise7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice seeds”
e7“ROS and ASC are involved in its inhibition of GA biosynthesis”
The same questions in other papers
ascorbic acid · growth · Oryza sativa (rice)Results differ
4 papers in the same direction as this paper · 2 in the opposite direction
- positive
- negative
- no effect
3 papers more in this group
See all 7 papers →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.