Abstract
Segments of rice leaves at different nodal positions were incubated in NaCl solutions for various periods, and the chlorophyll content, Na content, CI content, Na/K ratio and the ultrastructure of excised leaf tissues were examined. The chlorophyll content of the leaf tissues decreased with increasing NaCl concentration and incubation period. Na and CI contents of the leaf tissues also increased with increasing NaCl concentration, but the decrease in chlorophyll content by salt stress was greater in old than in young tissues even when both tissues contained comparable amounts of Na and CI. The presence of benzylaminopurine (BAP) alleviated the salt stress-induced decrease in chlorophyll content, but did not significantly affect the element contents. Ultrastructural damages were apparent in the chloroplasts of the leaf tissues subjected to salt stress. In 0.1% NaCl-treated old leaf tissues, the thylakoids were swollen, the envelope was partly destroyed causing leakage of the chloroplast contents. However, these damages were alleviated by the addition of BAP to the NaCl solution. In young leaf tissues, the thylakoids were swollen by incubation in 1.0% NaCl solution, but no structural distortion was observed in a 0.1% NaCl solution even without BAP added. The present study suggests that the leaf tissues were damaged by an increasing salt content and became more sensitive to salt stress with advancing leaf age. BAP seemed to alleviate the damages by salt stress through retardation of leaf aging.
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Claims 14
Claim · model-written summary
Leaf chlorophyll decreased with higher NaCl concentration and longer incubation.
- Taxon
- Rice
Oryza sativat0 - Organ / stage
- leaf tissuese0
- Treatment
- NaCle0
- Outcome
- chlorophyll contente0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The chlorophyll content of the leaf tissues decreased with increasing NaCl concentration and incubation period.”
t0“Rice Leaf Tissues”
Claim · model-written summary
Leaf Na content increased with NaCl concentration.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Na and CI contents of the leaf tissues also increased with increasing NaCl concentration”
t0“Rice Leaf Tissues”
Claim · model-written summary
Leaf CI content increased with NaCl concentration.
- Taxon
- RiceOryza sativat0
- Organ / stage
- leaf tissuese0
- Treatment
- NaCle0
- Outcome
- CI contentse0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Na and CI contents of the leaf tissues also increased with increasing NaCl concentration”
t0“Rice Leaf Tissues”
Claim · model-written summary
Under salt stress, old leaves lost more chlorophyll than young leaves despite comparable Na and CI contents.
- Taxon
- RiceOryza sativat0
- Organ / stage
- olde0
- Treatment
- salt stresse0
- Outcome
- chlorophyll contente0
- Direction
- greatere0
- Qualifier
- comparable amounts of Na and CIe0
- Comparator
- young tissuese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the decrease in chlorophyll content by salt stress was greater in old than in young tissues even when both tissues contained comparable amounts of Na and CI”
t0“Rice Leaf Tissues”
Claim · model-written summary
BAP alleviated the salt-related decline in chlorophyll.
- Taxon
- RiceOryza sativat0
- Treatment
- benzylaminopurine (BAP)e0
- Outcome
- chlorophyll contente0
- Direction
- alleviatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The presence of benzylaminopurine (BAP) alleviated the salt stress-induced decrease in chlorophyll content”
t0“Rice Leaf Tissues”
Claim · model-written summary
BAP did not significantly affect leaf element contents.
- Taxon
- RiceOryza sativat0
- Treatment
- benzylaminopurine (BAP)e1
- Outcome
- element contentse0
- Direction
- did not significantly affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but did not significantly affect the element contents”
e1“The presence of benzylaminopurine (BAP) alleviated the salt stress-induced decrease in chlorophyll content”
t0“Rice Leaf Tissues”
Claim · model-written summary
Salt stress caused ultrastructural damage in leaf chloroplasts.
- Taxon
- RiceOryza sativat0
- Organ / stage
- chloroplastse0
- Treatment
- salt stresse0
- Outcome
- Ultrastructural damagese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ultrastructural damages were apparent in the chloroplasts of the leaf tissues subjected to salt stress.”
t0“Rice Leaf Tissues”
Claim · model-written summary
In old leaves treated with 0.1% NaCl, thylakoids swelled.
- Taxon
- RiceOryza sativat0
- Organ / stage
- old leaf tissuese0
- Treatment
- 0.1% NaCle0
- Outcome
- thylakoids were swollene0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 0.1% NaCl-treated old leaf tissues, the thylakoids were swollen”
t0“Rice Leaf Tissues”
Claim · model-written summary
In old leaves treated with 0.1% NaCl, the chloroplast envelope was partly destroyed and contents leaked.
- Taxon
- RiceOryza sativat0
- Organ / stage
- old leaf tissuese0
- Treatment
- 0.1% NaCle0
- Outcome
- the envelope was partly destroyed causing leakage of the chloroplast contentse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 0.1% NaCl-treated old leaf tissues, the thylakoids were swollen, the envelope was partly destroyed causing leakage of the chloroplast contents.”
t0“Rice Leaf Tissues”
Claim · model-written summary
Adding BAP alleviated chloroplast structural damage under NaCl treatment.
- Taxon
- RiceOryza sativat0
- Organ / stage
- old leaf tissuese1
- Treatment
- addition of BAP to the NaCl solutione0
- Outcome
- these damagese0
- Direction
- alleviatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these damages were alleviated by the addition of BAP to the NaCl solution”
e1“In 0.1% NaCl-treated old leaf tissues, the thylakoids were swollen, the envelope was partly destroyed causing leakage of the chloroplast contents.”
t0“Rice Leaf Tissues”
Claim · model-written summary
Young leaf thylakoids swelled in 1.0% NaCl solution.
- Taxon
- RiceOryza sativat0
- Organ / stage
- young leaf tissuese0
- Treatment
- 1.0% NaCl solutione0
- Outcome
- thylakoids were swollene0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In young leaf tissues, the thylakoids were swollen by incubation in 1.0% NaCl solution”
t0“Rice Leaf Tissues”
Claim · model-written summary
Young leaves showed no structural distortion in 0.1% NaCl without BAP.
- Taxon
- RiceOryza sativat0
- Organ / stage
- young leaf tissuese1
- Treatment
- 0.1% NaCl solutione0
- Outcome
- no structural distortione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no structural distortion was observed in a 0.1% NaCl solution even without BAP added”
e1“In young leaf tissues, the thylakoids were swollen by incubation in 1.0% NaCl solution”
t0“Rice Leaf Tissues”
Claim · model-written summary
The authors infer that advancing leaf age increases sensitivity to salt stress.
- Taxon
- RiceOryza sativat0
- Organ / stage
- leafe0
- Treatment
- salt stresse0
- Outcome
- sensitive to salt stresse0
- Direction
- more sensitivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“became more sensitive to salt stress with advancing leaf age”
t0“Rice Leaf Tissues”
Claim · model-written summary
The authors propose BAP alleviates salt damage by retarding leaf aging.
- Taxon
- RiceOryza sativat0
- Treatment
- BAPe0
- Outcome
- damages by salt stresse0
- Direction
- alleviatee0
- Qualifier
- retardation of leaf aginge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BAP seemed to alleviate the damages by salt stress through retardation of leaf aging.”
t0“Rice Leaf Tissues”
The same questions in other papers
N-benzyladenine · physiology: pigments · Oryza sativa (rice)Positive and negative results
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- negative
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See all 8 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.