Abstract
This work supports further the thesis that under conditions of water stress, cell water content may supersede hormonal regulation in effecting enzyme activity, thus becoming a regulatory factor in cellular metabolism. Addition of NaCl to the root medium of barley plants (Hordeum vulgare L.) markedly increased leaf RNase activity parallel to an increase of leaf water saturation deficit (WSD). Kinetin and abscisic acid, applied to the salinated plants, also modified RNase activity, as well as leaf-WSD. The familiar pattern of effects of these hormones on leaf RNase as well as leaf chlorophyll content was inverted, kinetin effected a relative increase in RNase activity and a decrease in leaf chlorophyll, whereas abscisic acid effected a relative decrease in RNase activity and maintained chlorophyll content. A close relationship between enzyme activity and leaf WSD became evident when leaf RNase and protease activities in the salinated plants were plotted against leaf WSD. This close relationship was maintained irrespective of the hormonal treatments, which in themselves markedly modified leaf WSD. As predicted, high relative humidity which relived the leaves from salt-induced water stress prevented the salt-induced rise in RNase activity.
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Claims 10
Claim · model-written summary
The authors propose that cell water content can supersede hormonal regulation of enzyme activity under water stress.
- Taxon
- barley plants
.jpg?width=60)
Hordeum vulgaree1 - Outcome
- enzyme activitye0
- Qualifier
- cell water content may supersede hormonal regulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“under conditions of water stress, cell water content may supersede hormonal regulation in effecting enzyme activity”
e1“barley plants (Hordeum vulgare L.)”
Claim · model-written summary
NaCl increased leaf RNase activity in barley.
- Taxon
- barley plantsHordeum vulgaree1
- Treatment
- Addition of NaCl to the root mediume0
- Outcome
- leaf RNase activitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition of NaCl to the root medium of barley plants (Hordeum vulgare L.) markedly increased leaf RNase activity”
e1“barley plants (Hordeum vulgare L.)”
Claim · model-written summary
NaCl increased barley leaf water saturation deficit.
- Taxon
- barley plantsHordeum vulgaree1
- Treatment
- Addition of NaCl to the root mediume0
- Outcome
- leaf water saturation deficite0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition of NaCl to the root medium of barley plants (Hordeum vulgare L.) markedly increased leaf RNase activity parallel to an increase of leaf water saturation deficit (WSD)”
e1“barley plants (Hordeum vulgare L.)”
Claim · model-written summary
Kinetin relatively increased RNase activity in salinated barley.
- Taxon
- barley plantsHordeum vulgaree1
- Treatment
- kinetine0
- Outcome
- RNase activitye0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kinetin and abscisic acid, applied to the salinated plants, also modified RNase activity, as well as leaf-WSD. The familiar pattern of effects of these hormones on leaf RNase as well as leaf chlorophyll content was inverted, kinetin effected a relative increase in RNase activity”
e1“barley plants (Hordeum vulgare L.)”
Claim · model-written summary
Kinetin decreased leaf chlorophyll in salinated barley.
- Taxon
- barley plantsHordeum vulgaree1
- Treatment
- kinetine0
- Outcome
- leaf chlorophylle0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“kinetin effected a relative increase in RNase activity and a decrease in leaf chlorophyll”
t0“Leaf Cell Water and Enzyme Activity”
e1“barley plants (Hordeum vulgare L.)”
Claim · model-written summary
Abscisic acid relatively decreased RNase activity in salinated barley.
- Taxon
- barley plantsHordeum vulgaree1
- Treatment
- abscisic acide0
- Outcome
- RNase activitye0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“abscisic acid effected a relative decrease in RNase activity and maintained chlorophyll content”
t0“Leaf Cell Water and Enzyme Activity”
e1“barley plants (Hordeum vulgare L.)”
Claim · model-written summary
Abscisic acid maintained chlorophyll content in salinated barley.
- Taxon
- barley plantsHordeum vulgaree1
- Treatment
- abscisic acide0
- Outcome
- chlorophyll contente0
- Direction
- maintainede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“abscisic acid effected a relative decrease in RNase activity and maintained chlorophyll content”
e1“barley plants (Hordeum vulgare L.)”
Claim · model-written summary
Leaf RNase activity was closely related to leaf water saturation deficit in salinated barley, regardless of hormonal treatment.
- Taxon
- barley plantsHordeum vulgaree1
- Organ / stage
- leaf WSDe0
- Outcome
- leaf RNasee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A close relationship between enzyme activity and leaf WSD became evident when leaf RNase and protease activities in the salinated plants were plotted against leaf WSD. This close relationship was maintained irrespective of the hormonal treatments”
e1“barley plants (Hordeum vulgare L.)”
Claim · model-written summary
Leaf protease activity was closely related to leaf water saturation deficit in salinated barley, regardless of hormonal treatment.
- Taxon
- barley plantsHordeum vulgaree1
- Organ / stage
- leaf WSDe0
- Outcome
- protease activitiese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A close relationship between enzyme activity and leaf WSD became evident when leaf RNase and protease activities in the salinated plants were plotted against leaf WSD. This close relationship was maintained irrespective of the hormonal treatments”
e1“barley plants (Hordeum vulgare L.)”
Claim · model-written summary
High relative humidity prevented the salt-induced increase in barley leaf RNase activity.
- Taxon
- barley plantsHordeum vulgaree1
- Treatment
- high relative humiditye0
- Outcome
- RNase activitye0
- Direction
- preventede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high relative humidity which relived the leaves from salt-induced water stress prevented the salt-induced rise in RNase activity”
e1“barley plants (Hordeum vulgare L.)”
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in vitro · physiology: enzyme activity · Hordeum vulgare (barley)Positive and negative results
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See all 5 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.