Abstract
Alkali stress has shown a strong effect on K+/Na+ homeostasis than salt stress in many plants. In this study, rice seedlings were subjected to salt stress (NaCl:Na2SO4 = 9:1; pH 5.45) or alkali stress (NaHCO3:Na2CO3= 9:1; pH 9.05). The contents of Na+, K+, and inorganic anions and organic acids in the stressed seedlings were then measured. Then, the expression of some genes related to K+/Na+ metabolism such as OsHKT, OsNHX and OsHAK families, the SOS pathway and OsAKT1 were assayed to investigate ion homeostasis and the regulative functions of these genes in rice alkali-tolerance. The results indicated that, alkali stress clearly reduced the contents of inorganic anions in rice, induced the massive influx of Na+ and a deficiency of K+ in roots, and disrupted Na+/K+ homeostasis and charge balance compared with salt stress (NaCl:Na2SO4 = 9:1; pH 5.45). Salt stress only has small effects on the OsHAK, OsNHX and OsHKT families and the OsAKT1and SOS pathways in rice, but alkali stress strongly stimulated their expression in roots and shoots. These findings suggested that the rice OsHKT family, OsNHX family and SOS pathway might play important roles in protecting shoots from high-Na+ injury caused by alkali stress, especially in controlling Na+ transport from roots to shoots. Under alkali stress,the over expression of OsHAKs and OsAKT1 might contribute to the release of K+ from roots to shoots or the K+ uptake by roots and maintain the potassium nutrition supply of shoots. There sponses of these genes to alkali stress indicated that they might play important roles in rice alkali tolerance. Therefore, we propose that these genes have the potential for use in alkali tolerance and should be investigated further.
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Claims 9
Claim · model-written summary
Alkali stress reduced rice inorganic anion content relative to salt stress.
- Taxon
- rice
Oryza sativae0 - Treatment
- alkali stresse0
- Outcome
- contents of inorganic anionse0
- Direction
- reducede0
- Comparator
- salt stresse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alkali stress clearly reduced the contents of inorganic anions in rice”
e1“compared with salt stress”
Claim · model-written summary
Alkali stress induced massive sodium influx in roots relative to salt stress.
- Taxon
- riceOryza sativae0
- Organ / stage
- rootse0
- Treatment
- alkali stresse0
- Outcome
- influx of Na+e0
- Direction
- massive influxe0
- Comparator
- salt stresse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alkali stress clearly reduced the contents of inorganic anions in rice, induced the massive influx of Na+ and a deficiency of K+ in roots”
e1“compared with salt stress”
Claim · model-written summary
Alkali stress caused root potassium deficiency relative to salt stress.
- Taxon
- riceOryza sativae0
- Treatment
- alkali stresse0
- Outcome
- deficiency of K+ in rootse0
- Comparator
- salt stresse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alkali stress clearly reduced the contents of inorganic anions in rice, induced the massive influx of Na+ and a deficiency of K+ in roots”
e1“compared with salt stress”
Claim · model-written summary
Alkali stress disrupted sodium/potassium homeostasis and charge balance relative to salt stress.
- Taxon
- riceOryza sativae1
- Treatment
- alkali stresse1
- Outcome
- Na+/K+ homeostasis and charge balancee0
- Direction
- disruptede0
- Comparator
- salt stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“disrupted Na+/K+ homeostasis and charge balance compared with salt stress”
e1“alkali stress clearly reduced the contents of inorganic anions in rice”
Claim · model-written summary
Salt stress had small effects on the named ion transport gene families and pathways.
- Taxon
- riceOryza sativae0
- Treatment
- Salt stresse0
- Outcome
- small effects on the OsHAK, OsNHX and OsHKT families and the OsAKT1and SOS pathwayse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt stress only has small effects on the OsHAK, OsNHX and OsHKT families and the OsAKT1and SOS pathways in rice”
Claim · model-written summary
Alkali stress strongly stimulated their expression in roots and shoots.
- Taxon
- riceOryza sativae1
- Organ / stage
- roots and shootse0
- Treatment
- alkali stresse0
- Gene
- OsHAK, OsNHX and OsHKT families and the OsAKT1and SOS pathwayse1
- Outcome
- expressione0
- Direction
- stimulatede0
- Comparator
- Salt stresse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alkali stress strongly stimulated their expression in roots and shoots”
e1“Salt stress only has small effects on the OsHAK, OsNHX and OsHKT families and the OsAKT1and SOS pathways in rice”
Claim · model-written summary
The authors suggest that OsHKT, OsNHX and SOS protect shoots from alkali-induced sodium injury by controlling transport.
- Taxon
- riceOryza sativae0
- Treatment
- alkali stresse0
- Gene
- OsHKT family, OsNHX family and SOS pathwaye0
- Outcome
- protecting shoots from high-Na+ injurye0
- Qualifier
- controlling Na+ transport from roots to shootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rice OsHKT family, OsNHX family and SOS pathway might play important roles in protecting shoots from high-Na+ injury caused by alkali stress, especially in controlling Na+ transport from roots to shoots”
Claim · model-written summary
The authors suggest that OsHAKs and OsAKT1 support shoot potassium nutrition under alkali stress.
- Treatment
- alkali stresse0
- Gene
- OsHAKs and OsAKT1e0
- Outcome
- maintain the potassium nutrition supply of shootse0
Not reportedTaxon
Verbatim
e0“Under alkali stress,the over expression of OsHAKs and OsAKT1 might contribute to the release of K+ from roots to shoots or the K+ uptake by roots and maintain the potassium nutrition supply of shoots”
Claim · model-written summary
The authors propose further investigation of these genes for alkali tolerance.
- Taxon
- riceOryza sativat0
- Outcome
- potential for use in alkali tolerance and should be investigated furthere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these genes have the potential for use in alkali tolerance and should be investigated further”
t0“rice”
The same questions in other papers
alkalinity · physiology: ion balance · Oryza sativa (rice)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
alkalinity · molecular: metabolites · Oryza sativa (rice)Positive and negative results
4 papers in the same direction as this paper · 3 in the opposite direction
- positive
- positive
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4 papers more in this group
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.