Abstract
The thylakoid membrane inside the chloroplast is the position where the light reaction of photosynthesis takes place,therefore,its structure and function are nearly correlative with photosynthesis of the plant leaves.Glysinebetaine(GB) is a quaternary ammonium compound.Several authors have studied the function of GB as an osmoprotectant in the adaptation to water,salt and cold stress.The objectives of this study were to determine the effects of salt stress on the structure and function of thylakoid membrane and the protection of GB on it under salt stress condition.Two wheat(Triticum aestivum L.) lines HF9703(drought-tolerant) and SN215953(drought-sensitive) were used in these examinations. 100 mmol/L NaCl was used to induce salt stress condition.1.5 mmol/L GB was used to study the function of GB on protecting thylakoid membrane from the damage of salt stress.The seedlings of two wheat lines were pretreated with Hoagland solution containing 1.5 mmol/L GB for 72 h,and then cultured with Hoagland solution containing 100 mmol/L NaCl for 48 h.The seedling leaves were used to study the effects of GB on the fatty acid composition and function of thylakoid membrane under salt stress.The results indicated that the level of linolenic acid(18:3) in phosphatidylglycerol(PG) and phosphatidylcholin(PC) of SN215953 were decreased significantly by salt stress(Table 2),while it was only the level of linolenic acid(18:3) in PC of HF9703 was decreased markedly by salt stress(Table 1).The changes of the fatty acid composition could be alleviated well by GB(Table 1,Table 2).Ca~(2+)-ATPase activity of thylakoid membrane(Fig.3),Hill-reaction activity (Fig.4),chlorophyll content(Fig.2) and photosynthesis(Fig.5) were decreased markedly under salt stress,and that did more markedly in SN215953 than in HF9703.These effects of salt stress on thylakoid membrane were also ameliorated by GB.The salt tolerance of different wheat lines was accordant with their drought tolerance character,but there was some difference between them also.Discussions were made on the possible mechanism of the effects of salt stress on fatty acid composition and function of thylakoid membrane,as well as the presumable mechanism of the effects of GB on alleviating the change of fatty acid composition and improving the function of thylakoid membrane.However,the affirmable mechanism about it needs to be studied further.
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Claims 8
Claim · model-written summary
Salt stress significantly reduced linolenic acid in PG and PC of SN215953.
- Taxon
- Wheat
Triticum aestivumt0 - Material
- SN215953e0
- Organ / stage
- Thylakoid Membranet0
- Treatment
- salt stresse0
- Outcome
- level of linolenic acid(18:3) in phosphatidylglycerol(PG) and phosphatidylcholin(PC)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the level of linolenic acid(18:3) in phosphatidylglycerol(PG) and phosphatidylcholin(PC) of SN215953 were decreased significantly by salt stress”
t0“Effects of Pretreated with Glycinebetaine on the Fatty Acid Composition and Function of Wheat Thylakoid Membrane under Salt Stress”
Claim · model-written summary
Salt stress markedly reduced linolenic acid in PC of HF9703.
- Taxon
- WheatTriticum aestivumt0
- Material
- HF9703e0
- Treatment
- salt stresse0
- Outcome
- level of linolenic acid(18:3) in PCe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“level of linolenic acid(18:3) in PC of HF9703 was decreased markedly by salt stress”
t0“Effects of Pretreated with Glycinebetaine on the Fatty Acid Composition and Function of Wheat Thylakoid Membrane under Salt Stress”
Claim · model-written summary
GB alleviated salt induced fatty acid changes.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- GBe0
- Outcome
- changes of the fatty acid compositione0
- Direction
- alleviatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The changes of the fatty acid composition could be alleviated well by GB”
t0“Effects of Pretreated with Glycinebetaine on the Fatty Acid Composition and Function of Wheat Thylakoid Membrane under Salt Stress”
Claim · model-written summary
Salt stress markedly reduced thylakoid ATPase and Hill reaction activity.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- salt stresse0
- Outcome
- Ca~(2+)-ATPase activity of thylakoid membrane(Fig.3),Hill-reaction activitye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ca~(2+)-ATPase activity of thylakoid membrane(Fig.3),Hill-reaction activity (Fig.4),chlorophyll content(Fig.2) and photosynthesis(Fig.5) were decreased markedly under salt stress”
t0“Effects of Pretreated with Glycinebetaine on the Fatty Acid Composition and Function of Wheat Thylakoid Membrane under Salt Stress”
Claim · model-written summary
Salt stress markedly reduced chlorophyll content and photosynthesis.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- salt stresse0
- Outcome
- chlorophyll content(Fig.2) and photosynthesise0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chlorophyll content(Fig.2) and photosynthesis(Fig.5) were decreased markedly under salt stress”
t0“Effects of Pretreated with Glycinebetaine on the Fatty Acid Composition and Function of Wheat Thylakoid Membrane under Salt Stress”
Claim · model-written summary
Salt effects were more marked in SN215953 than HF9703.
- Taxon
- WheatTriticum aestivumt0
- Material
- SN215953e0
- Outcome
- more markedlye0
- Comparator
- HF9703e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“that did more markedly in SN215953 than in HF9703”
t0“Effects of Pretreated with Glycinebetaine on the Fatty Acid Composition and Function of Wheat Thylakoid Membrane under Salt Stress”
Claim · model-written summary
GB ameliorated salt effects on thylakoid function.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- GBe0
- Outcome
- effects of salt stress on thylakoid membranee0
- Direction
- amelioratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These effects of salt stress on thylakoid membrane were also ameliorated by GB”
t0“Effects of Pretreated with Glycinebetaine on the Fatty Acid Composition and Function of Wheat Thylakoid Membrane under Salt Stress”
Claim · model-written summary
Salt tolerance broadly accorded with drought tolerance across the wheat lines.
- Taxon
- WheatTriticum aestivumt0
- Material
- different wheat linese0
- Outcome
- salt tolerancee0
- Qualifier
- there was some difference between them alsoe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The salt tolerance of different wheat lines was accordant with their drought tolerance character,but there was some difference between them also”
t0“Effects of Pretreated with Glycinebetaine on the Fatty Acid Composition and Function of Wheat Thylakoid Membrane under Salt Stress”
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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.