Abstract
Changes of ACC and MACC levels, ACC synthase activity as well as ethylene production in the leaves of two spring wheat (Triticum aestivum L.) cultivars 8139 (with relatively low drought-resistance) and 504 (with relatively high drought-resistance) during water stress were determined. The levels of ACC and MACC in both cultivars decreased in the first 24 It of water stress and increased in the second 24 It while the activities of ACC synthase increased continuously throughout the entire period of treatment (48 h), As water stress progressed, ethylene production decreased continuously in cv. 8139 but remarkably increased earlier and decreased later in the cv. 504. Moreover, the decrease in RWC of stressed leaves was greater and the changes in ACC and MACC levels as well as ACC synthase activity were higher in the drought-sensitive cv. 8139 than in the drought-resistant cv, 504 during water stress. The levels of ACC and MACC, activities of ACC synthase and productions of ethylene in the stressed leaves in two cultivars were significantly altered by the application of MGBG (an inhibitor of SAMDC) and AOA (an inhibitor of ACC synthase) where their effects on these items were almost opposite. They were increased by the former inhibitor but reduced by the latter. All of these results suggested that the level of ethylene production in plants did not depend on the level of ACC during water stress. The increase in the level of ethylene in the drought-resistant cultivar during the earlier period of water stress might be a phenomenon of adaptation to water stress and be correlated with the development of the drought-tolerance in plants and playing role in the transduction of stress signal. The role of MACC, however, was primarily in the regulation of ethylene production under water stress.
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Claims 11
Claim · model-written summary
In both spring wheat cultivars, ACC and MACC levels decreased during the first 24 h of water stress and increased during the second 24 h.
- Taxon
- Spring Wheat
Triticum aestivumt0 - Treatment
- water stresse0
- Outcome
- levels of ACC and MACCe0
- Direction
- decreased in the first 24 It of water stress and increased in the second 24 Ite0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The levels of ACC and MACC in both cultivars decreased in the first 24 It of water stress and increased in the second 24 It”
t0“Spring Wheat”
Claim · model-written summary
ACC synthase activity in stressed wheat leaves increased continuously throughout the 48 h of water stress treatment.
- Taxon
- Spring WheatTriticum aestivumt0
- Outcome
- activities of ACC synthasee1
- Direction
- increased continuouslye1
- Qualifier
- 48 he1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the activities of ACC synthase increased continuously throughout the entire period of treatment (48 h)”
t0“Spring Wheat”
Claim · model-written summary
Ethylene production decreased continuously as water stress progressed in cultivar 8139.
- Taxon
- Spring WheatTriticum aestivumt0
- Material
- cv. 8139e2
- Outcome
- ethylene productione2
- Direction
- decreased continuouslye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“ethylene production decreased continuously in cv. 8139 but remarkably increased earlier and decreased later in the cv. 504”
t0“Spring Wheat”
Claim · model-written summary
Ethylene production in cultivar 504 increased remarkably early and decreased later as water stress progressed.
- Taxon
- Spring WheatTriticum aestivumt0
- Material
- cv. 504e2
- Outcome
- ethylene productione2
- Direction
- remarkably increased earlier and decreased latere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“ethylene production decreased continuously in cv. 8139 but remarkably increased earlier and decreased later in the cv. 504”
t0“Spring Wheat”
Claim · model-written summary
The decrease in leaf relative water content under water stress was greater in drought-sensitive cv. 8139 than in drought-resistant cv. 504.
- Taxon
- Spring WheatTriticum aestivumt0
- Material
- cv. 8139e3
- Treatment
- water stresse3
- Outcome
- decrease in RWC of stressed leavese3
- Direction
- greatere3
- Comparator
- drought-resistant cv, 504e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“the decrease in RWC of stressed leaves was greater and the changes in ACC and MACC levels as well as ACC synthase activity were higher in the drought-sensitive cv. 8139 than in the drought-resistant cv, 504 during water stress”
t0“Spring Wheat”
Claim · model-written summary
Changes in ACC and MACC levels and ACC synthase activity were higher in drought-sensitive cv. 8139 than in drought-resistant cv. 504 during water stress.
- Taxon
- Spring WheatTriticum aestivumt0
- Material
- cv. 8139e3
- Treatment
- water stresse3
- Outcome
- changes in ACC and MACC levels as well as ACC synthase activitye3
- Direction
- highere3
- Comparator
- drought-resistant cv, 504e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“the decrease in RWC of stressed leaves was greater and the changes in ACC and MACC levels as well as ACC synthase activity were higher in the drought-sensitive cv. 8139 than in the drought-resistant cv, 504 during water stress”
t0“Spring Wheat”
Claim · model-written summary
MGBG, an inhibitor of SAMDC, significantly altered ACC and MACC levels, ACC synthase activity and ethylene production in stressed leaves of both cultivars, increasing them.
- Taxon
- Spring WheatTriticum aestivumt0
- Treatment
- MGBG (an inhibitor of SAMDC)e4
- Outcome
- levels of ACC and MACC, activities of ACC synthase and productions of ethylenee4
- Direction
- increasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“The levels of ACC and MACC, activities of ACC synthase and productions of ethylene in the stressed leaves in two cultivars were significantly altered by the application of MGBG (an inhibitor of SAMDC) and AOA (an inhibitor of ACC synthase)”
e5“They were increased by the former inhibitor but reduced by the latter”
t0“Spring Wheat”
Claim · model-written summary
AOA, an inhibitor of ACC synthase, significantly altered ACC and MACC levels, ACC synthase activity and ethylene production in stressed leaves of both cultivars, reducing them.
- Taxon
- Spring WheatTriticum aestivumt0
- Treatment
- AOA (an inhibitor of ACC synthase)e4
- Outcome
- levels of ACC and MACC, activities of ACC synthase and productions of ethylenee4
- Direction
- reducede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“The levels of ACC and MACC, activities of ACC synthase and productions of ethylene in the stressed leaves in two cultivars were significantly altered by the application of MGBG (an inhibitor of SAMDC) and AOA (an inhibitor of ACC synthase)”
e5“They were increased by the former inhibitor but reduced by the latter”
t0“Spring Wheat”
Claim · model-written summary
The authors concluded that ethylene production level in plants did not depend on the ACC level during water stress.
- Taxon
- Spring WheatTriticum aestivumt0
- Treatment
- water stresse6
- Compound
- ACCe6
- Outcome
- level of ethylene productione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“the level of ethylene production in plants did not depend on the level of ACC during water stress”
t0“Spring Wheat”
Claim · model-written summary
The authors suggest the early increase in ethylene in the drought-resistant cultivar during water stress might be an adaptation to water stress.
- Taxon
- Spring WheatTriticum aestivumt0
- Outcome
- increase in the level of ethylenee7
- Qualifier
- adaptation to water stresse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“The increase in the level of ethylene in the drought-resistant cultivar during the earlier period of water stress might be a phenomenon of adaptation to water stress”
t0“Spring Wheat”
Claim · model-written summary
The authors conclude that MACC played its role primarily in regulating ethylene production under water stress.
- Taxon
- Spring WheatTriticum aestivumt0
- Treatment
- water stresse6
- Compound
- MACCe6
- Outcome
- regulation of ethylene productione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“The role of MACC, however, was primarily in the regulation of ethylene production under water stress”
t0“Spring Wheat”