Abstract
The growth and development of plants can be limited by environmental stresses such as salinity. It has been suggested that the non-phosphorylating alternative respiratory pathway in plants, mediated by the NAD(P)H dehydrogenase [NAD(P)H DH] and alternative oxidase (AOX), is important during environmental stresses. The involvement of this alternative pathway in a stress response may be linked to its capacity to uncouple carbon metabolism from adenylate control and/or the minimization of the formation of destructive reactive oxygen species (ROS). Salinity stress is a widespread, adverse environmental stress, which leads to an ionic imbalance, hyperosmotic stress and oxidative stress, the latter being the result of ROS formation. In this study, we show that salinity stress of Arabidopsis thaliana plants resulted in the formation of ROS, increased levels of Na+ in both the shoot and the root and an increase in transcription of Ataox1a, Atndb2 and Atndb4 genes, indicating the formation of an abridged non-phosphorylating electron transport chain in response to salinity stress. Furthermore, plants constitutively over-expressing Ataox1a, with increased AOX capacity, showed lower ROS formation, 30-40% improved growth rates and lower shoot Na+ content compared with controls, when grown under salinity stress conditions. Thus, more active AOX in roots and shoots can improve the salt tolerance of Arabidopsis as defined by its ability to grow more effectively in the presence of NaCl, and maintain lower shoot Na+ content. AOX does have an important role in stress adaptation in plants, and these results provide some validation of the hypothesis that AOX can play a critical role in cell re-programming under salinity stress.
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Claims 8
Claim · model-written summary
Salinity stress formed ROS in Arabidopsis.
- Taxon
- Arabidopsis thaliana
Arabidopsis thalianae0 - Treatment
- salinity stresse0
- Outcome
- formation of ROSe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“salinity stress of Arabidopsis thaliana plants resulted in the formation of ROS, increased levels of Na+ in both the shoot and the root and an increase in transcription of Ataox1a, Atndb2 and Atndb4 genes”
Claim · model-written summary
Salinity stress increased levels of Na+ in both the shoot and the root in Arabidopsis.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae0
- Treatment
- salinity stresse0
- Outcome
- levels of Na+ in both the shoot and the roote0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“salinity stress of Arabidopsis thaliana plants resulted in the formation of ROS, increased levels of Na+ in both the shoot and the root and an increase in transcription of Ataox1a, Atndb2 and Atndb4 genes”
Claim · model-written summary
Salinity stress increased transcription of Ataox1a in Arabidopsis.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae0
- Treatment
- salinity stresse0
- Gene
- Ataox1ae0
- Outcome
- transcription of Ataox1ae0
- Direction
- increaseinferrede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“salinity stress of Arabidopsis thaliana plants resulted in the formation of ROS, increased levels of Na+ in both the shoot and the root and an increase in transcription of Ataox1a, Atndb2 and Atndb4 genes”
Claim · model-written summary
Salinity stress increased transcription of Atndb2 in Arabidopsis.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae0
- Treatment
- salinity stresse0
- Gene
- Atndb2e0
- Outcome
- transcriptione0
- Direction
- increaseinferrede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“salinity stress of Arabidopsis thaliana plants resulted in the formation of ROS, increased levels of Na+ in both the shoot and the root and an increase in transcription of Ataox1a, Atndb2 and Atndb4 genes”
Claim · model-written summary
Salinity stress increased transcription of Atndb4 in Arabidopsis.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae0
- Treatment
- salinity stresse0
- Gene
- Atndb4e0
- Outcome
- transcriptione0
- Direction
- increaseinferrede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“salinity stress of Arabidopsis thaliana plants resulted in the formation of ROS, increased levels of Na+ in both the shoot and the root and an increase in transcription of Ataox1a, Atndb2 and Atndb4 genes”
Claim · model-written summary
Ataox1a overexpression reduced ROS formation under salinity stress versus controls.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- constitutively over-expressing Ataox1ae0
- Gene
- Ataox1ae0
- Outcome
- ROS formatione0
- Direction
- lowere0
- Qualifier
- salinity stress conditionse0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis thaliana”
e0“plants constitutively over-expressing Ataox1a, with increased AOX capacity, showed lower ROS formation, 30-40% improved growth rates and lower shoot Na+ content compared with controls, when grown under salinity stress conditions”
Claim · model-written summary
Ataox1a overexpression improved growth rates under salinity stress versus controls.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- constitutively over-expressing Ataox1ae0
- Gene
- Ataox1ae0
- Outcome
- growth ratese0
- Direction
- improvede0
- Value
- 30-40%e0
- Qualifier
- salinity stress conditionse0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis thaliana”
e0“plants constitutively over-expressing Ataox1a, with increased AOX capacity, showed lower ROS formation, 30-40% improved growth rates and lower shoot Na+ content compared with controls, when grown under salinity stress conditions”
Claim · model-written summary
Ataox1a overexpression reduced shoot Na+ content under salinity stress versus controls.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- constitutively over-expressing Ataox1ae0
- Gene
- Ataox1ae0
- Outcome
- shoot Na+ contente0
- Direction
- lowere0
- Qualifier
- salinity stress conditionse0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis thaliana”
e0“plants constitutively over-expressing Ataox1a, with increased AOX capacity, showed lower ROS formation, 30-40% improved growth rates and lower shoot Na+ content compared with controls, when grown under salinity stress conditions”
The same questions in other papers
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See all 8 papers →salinity · physiology: oxidative · Arabidopsis thaliana (thale cress)Results agree
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- negative
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See all 10 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.