Abstract
The changes in leaf extension, plant dryweight, leaf area, net assimilation rate (E), relative growth-rate (RW), and relative leaf growth-rate (RL), have been studied for four species grown for 2 weeks in solutions of polyethylene glycol 4000 of controlled osmotic potentials. All aspects of growth were decreased by decreasing the osmotic potential (πsol) of the root medium and the leaf water potential (π), and ceased when π/ was greater than — 10 bars in bean, cotton, maize. These plants were more susceptible than ryegrass to water stress. Growth of bean stopped at π equal to about —6 bars, but even at —10 bars ryegrass was capable of some growth. Slight decrease in π from the values in the control plants decreased growth during the first week but partial recovery was apparent during the second week's growth in solution culture, when leaf extension, E, RL and RW increased in plants subjected to stress. Examination of the water balance, water potential, osmotic potential and turgor of the leaf in relation to relative water content suggests that recovery was related to increased turgor and that the ability of the plants to grow at reduced values of the osmotic potential of the root medium and of the leaf water potential depend on the maintenance of turgor.
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Claims 10
Claim · model-written summary
All aspects of growth in bean, cotton and maize decreased as the osmotic potential of the root medium decreased.
- Taxon
- bean, cotton, maizee3
- Treatment
- polyethylene glycol 4000e1
- Outcome
- All aspects of growthe2
- Direction
- decreasede2
- Qualifier
- decreasing the osmotic potentiale2
Not reportedComparatorSetting
Verbatim
e0“studied for four species grown for 2 weeks”
e1“solutions of polyethylene glycol 4000 of controlled osmotic potentials”
e2“All aspects of growth were decreased by decreasing the osmotic potential”
e3“ceased when π/ was greater than — 10 bars in bean, cotton, maize”
Claim · model-written summary
Growth of bean, cotton and maize ceased when leaf water potential was above -10 bars.
- Taxon
- bean, cotton, maizee3
- Treatment
- polyethylene glycol 4000e1
- Outcome
- growthe2
- Direction
- ceasede3
- Value
- 10 barse3
Not reportedComparatorSetting
Verbatim
e1“solutions of polyethylene glycol 4000 of controlled osmotic potentials”
e2“All aspects of growth were decreased by decreasing the osmotic potential”
e3“ceased when π/ was greater than — 10 bars in bean, cotton, maize”
Claim · model-written summary
Growth of bean stopped at a leaf water potential of about -6 bars.
Not reportedComparatorSetting
Verbatim
e1“solutions of polyethylene glycol 4000 of controlled osmotic potentials”
e4“Growth of bean stopped at π equal to about —6 bars, but even at —10 bars ryegrass was capable of some growth”
Claim · model-written summary
Ryegrass remained capable of some growth even at -10 bars.
- Outcome
- some growthe4
LoliumNot reportedSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Growth of bean stopped at π equal to about —6 bars, but even at —10 bars ryegrass was capable of some growth”
Claim · model-written summary
Bean, cotton and maize were more susceptible to water stress than ryegrass.
Not reportedSetting
Verbatim
e3“ceased when π/ was greater than — 10 bars in bean, cotton, maize”
e5“These plants were more susceptible than ryegrass to water stress”
Claim · model-written summary
A slight decrease in leaf water potential decreased growth during the first week.
- Taxon
- four speciese0
- Treatment
- Slight decreasee6
- Outcome
- growthe6
- Direction
- decreasede6
- Qualifier
- during the first weeke6
- Comparator
- control plantse6
Not reportedSetting
Verbatim
e0“studied for four species grown for 2 weeks”
e6“Slight decrease in π from the values in the control plants decreased growth during the first week but partial recovery was apparent during the second week's growth in solution culture, when leaf extension, E, RL and RW increased in plants subjected to stress”
Claim · model-written summary
Leaf extension, E and RL increased in stressed plants during the second week of solution culture.
- Taxon
- four speciese0
- Treatment
- Slight decreasee6
- Outcome
- leaf extension, E, RLe6
- Direction
- increasede6
- Qualifier
- second weeke6
- Comparator
- control plantse6
Not reportedSetting
Verbatim
e0“studied for four species grown for 2 weeks”
e6“Slight decrease in π from the values in the control plants decreased growth during the first week but partial recovery was apparent during the second week's growth in solution culture, when leaf extension, E, RL and RW increased in plants subjected to stress”
Claim · model-written summary
RW increased in stressed plants during the second week of solution culture.
- Taxon
- four speciese0
- Treatment
- Slight decreasee6
- Outcome
- RWe6
- Direction
- increasede6
- Qualifier
- second weeke6
- Comparator
- control plantse6
Not reportedSetting
Verbatim
e0“studied for four species grown for 2 weeks”
e6“Slight decrease in π from the values in the control plants decreased growth during the first week but partial recovery was apparent during the second week's growth in solution culture, when leaf extension, E, RL and RW increased in plants subjected to stress”
Claim · model-written summary
Recovery of growth under water stress was related to increased turgor.
Not reportedSetting
Verbatim
e0“studied for four species grown for 2 weeks”
e7“recovery was related to increased turgor”
Claim · model-written summary
The ability of plants to grow at reduced osmotic potential depends on maintenance of turgor.
Not reportedSetting
Verbatim
e0“studied for four species grown for 2 weeks”
e7“the ability of the plants to grow at reduced values of the osmotic potential of the root medium and of the leaf water potential depend on the maintenance of turgor”
The same questions in other papers
poly(ethylene glycol) · growth · Phaseolus vulgaris (common bean)Results differ
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
poly(ethylene glycol) · growth · Zea mays (maize)Results differ
27 papers in the same direction as this paper · 12 in the opposite direction
- positive
- positive
- positive
36 papers more in this group
See all 40 papers →poly(ethylene glycol) · growth · Gossypium hirsutum (cotton)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- negative
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.