Abstract
The aim of this study was to evaluate the physiological responses of linseed ( Linum usitatissimum L.) seedling growth after establishment to osmotic, salt, and alkali stresses and to elucidate the adaptive mechanisms involved. Stresses were generated by exposure for 10 d to different iso‐osmotic (–0.2, –0.5, –0.8 MPa) solutions of PEG 6000 (osmotic stress), 1:1, NaCl/Na 2 SO 4 (salt stress), and 1:1, NaHCO 3 /Na 2 SO 4 (alkali stress). The RGR decreased as osmotic potential decreased; decreases due to alkali stress were much greater than those due to osmotic stress or salt stress. This was demonstrated by greater reductions in water content and root system activity. Photosynthetic activity and pigment indices were nearly unchanged with increasing osmotic and salt stresses, but were severely inhibited under alkali stress. This implies that alkali stress may be mediated through Na + uptake accumulation to toxic levels, leading to a decrease in photosynthetic pigments and damage to the photosynthetic apparatus. Massive Na + influx may be the main cause of damage from alkali stress. The alkali stress causes precipitation of phosphate and metal ions, which causes a sharp decrease in ionic activity and in the free concentrations of various other ions. We found that proline synthesis decreased osmotic potential, remedied the shortage of inorganic anions, and maintained stability of the intracellular pH. Betaine contributions to osmotic adjustment were small because its ratio to total organic matter was very low. The accumulation of organic acids may be a central component of the adaptive mechanism by which ionic balance is maintained under alkali stress.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 12
Claim · model-written summary
Alkali stress reduced linseed relative growth rate much more than osmotic or salt stress.
Verbatim
t0“Physiological Responses of Linseed Seedlings”
e1“The RGR decreased as osmotic potential decreased; decreases due to alkali stress were much greater than those due to osmotic stress or salt stress”
Claim · model-written summary
Relative growth rate of linseed decreased as osmotic potential decreased.
Verbatim
t0“Physiological Responses of Linseed Seedlings”
e1“The RGR decreased as osmotic potential decreased; decreases due to alkali stress were much greater than those due to osmotic stress or salt stress”
Claim · model-written summary
Alkali stress caused greater reductions in water content and root system activity than osmotic or salt stress in linseed.
Verbatim
t0“Physiological Responses of Linseed Seedlings”
e1“The RGR decreased as osmotic potential decreased; decreases due to alkali stress were much greater than those due to osmotic stress or salt stress”
e2“This was demonstrated by greater reductions in water content and root system activity”
Claim · model-written summary
Photosynthetic activity and pigment indices of linseed were nearly unchanged with increasing osmotic and salt stresses.
- Taxon
- Linseedt0
- Treatment
- increasing osmotic and salt stressese3
- Outcome
- Photosynthetic activity and pigment indicese3
- Direction
- nearly unchangede3
Not reportedComparator
Verbatim
t0“Physiological Responses of Linseed Seedlings”
e3“Photosynthetic activity and pigment indices were nearly unchanged with increasing osmotic and salt stresses, but were severely inhibited under alkali stress”
Claim · model-written summary
Alkali stress severely inhibited photosynthetic activity and pigment indices of linseed compared with osmotic and salt stresses.
Verbatim
t0“Physiological Responses of Linseed Seedlings”
e3“Photosynthetic activity and pigment indices were nearly unchanged with increasing osmotic and salt stresses, but were severely inhibited under alkali stress”
Claim · model-written summary
Alkali stress may decrease photosynthetic pigments in linseed through Na+ uptake accumulation to toxic levels.
Verbatim
t0“Physiological Responses of Linseed Seedlings”
e4“This implies that alkali stress may be mediated through Na + uptake accumulation to toxic levels, leading to a decrease in photosynthetic pigments and damage to the photosynthetic apparatus”
Claim · model-written summary
Massive Na+ influx may be the main cause of damage from alkali stress in linseed.
Verbatim
t0“Physiological Responses of Linseed Seedlings”
e5“Massive Na + influx may be the main cause of damage from alkali stress”
Claim · model-written summary
Alkali-stress precipitation of phosphate and metal ions causes a sharp decrease in ionic activity in linseed.
Verbatim
t0“Physiological Responses of Linseed Seedlings”
e6“The alkali stress causes precipitation of phosphate and metal ions, which causes a sharp decrease in ionic activity”
Claim · model-written summary
Proline synthesis decreased osmotic potential in linseed under stress.
Verbatim
t0“Physiological Responses of Linseed Seedlings”
e7“We found that proline synthesis decreased osmotic potential, remedied the shortage of inorganic anions, and maintained stability of the intracellular pH”
Claim · model-written summary
Proline in linseed remedied the shortage of inorganic anions and maintained stability of the intracellular pH.
Verbatim
t0“Physiological Responses of Linseed Seedlings”
e7“We found that proline synthesis decreased osmotic potential, remedied the shortage of inorganic anions, and maintained stability of the intracellular pH”
Claim · model-written summary
Betaine contributed little to osmotic adjustment in linseed because its ratio to total organic matter was very low.
Verbatim
t0“Physiological Responses of Linseed Seedlings”
e7“Betaine contributions to osmotic adjustment were small because its ratio to total organic matter was very low”
Claim · model-written summary
Accumulation of organic acids may maintain ionic balance in linseed under alkali stress.
Verbatim
t0“Physiological Responses of Linseed Seedlings”
e7“The accumulation of organic acids may be a central component of the adaptive mechanism by which ionic balance is maintained under alkali stress”
The same questions in other papers
alkalinity · growth · Linum usitatissimum (flax)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
alkalinity · physiology: photosynthesis · Linum usitatissimum (flax)Results agree
1 paper in the same direction as this paper
- negative
salinity · physiology: photosynthesis · Linum usitatissimum (flax)Results agree
5 papers in the same direction as this paper
- negative
- no effect
- negative
2 papers more in this group
See all 6 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.