Abstract
Organic acid secretion from higher plant roots into the rhizosphere soil plays an important role in nutrient acquisition and metal detoxification; however, their precise functions and the related mechanisms in abiotic stress tolerance remain poorly understood. Tobacco is an important crop plant, so thoroughly elucidating these factors in tobacco is of high priority. In the present study, the activation effect on soil potassium (K), contents of exuded organic acids, and physiological changes in the roots of various tobacco varieties under both normal K supply and K-deficiency stress were investigated. Our results showed that one high-K variety (ND202) exhibited a significantly higher total content of organic acids in the root exudates and the highest available K content in the rhizosphere soil, compared with two common ones (K326 and NC89). Moreover, the high-K tobacco variety was less affected in terms of root vigor under K-deficiency stress, and displayed greater increases in the activities of the stress-resistant enzymes consisting of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT). Taken together, these results provide evidence that tobacco roots exude large amounts of organic acids to increase the available K content in the rhizosphere soil and improve the utilization rate of soil K.
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Claims 5
Claim · model-written summary
ND202 had significantly more organic acids in root exudates than K326 and NC89.
- Taxon
- tobacco
Nicotiana tabacume0e1e2e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“one high-K variety (ND202) exhibited a significantly higher total content of organic acids in the root exudates and the highest available K content in the rhizosphere soil, compared with two common ones (K326 and NC89)”
e1“the high-K tobacco variety was less affected in terms of root vigor under K-deficiency stress”
e2“tobacco roots exude large amounts of organic acids”
e3“root exudates”
Claim · model-written summary
ND202 had the highest available rhizosphere soil K relative to K326 and NC89.
- Taxon
- tobaccoNicotiana tabacume0e1e2e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“one high-K variety (ND202) exhibited a significantly higher total content of organic acids in the root exudates and the highest available K content in the rhizosphere soil, compared with two common ones (K326 and NC89)”
e1“the high-K tobacco variety was less affected in terms of root vigor under K-deficiency stress”
e2“tobacco roots exude large amounts of organic acids”
e3“root exudates”
Claim · model-written summary
ND202 root vigor was less affected by K deficiency.
- Taxon
- tobaccoNicotiana tabacume0e1e2e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the high-K tobacco variety was less affected in terms of root vigor under K-deficiency stress”
e1“the high-K tobacco variety was less affected in terms of root vigor under K-deficiency stress”
e2“tobacco roots exude large amounts of organic acids”
e3“root exudates”
Claim · model-written summary
ND202 had greater increases in SOD, POD, and CAT activities under K deficiency.
- Taxon
- tobaccoNicotiana tabacume0e1e2e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“displayed greater increases in the activities of the stress-resistant enzymes consisting of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT)”
e1“the high-K tobacco variety was less affected in terms of root vigor under K-deficiency stress”
e2“tobacco roots exude large amounts of organic acids”
e3“root exudates”
Claim · model-written summary
Authors infer that tobacco root organic-acid exudation increases available soil K and K utilization.
- Taxon
- tobaccoNicotiana tabacume0e1e2e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tobacco roots exude large amounts of organic acids to increase the available K content in the rhizosphere soil and improve the utilization rate of soil K”
e1“the high-K tobacco variety was less affected in terms of root vigor under K-deficiency stress”
e2“tobacco roots exude large amounts of organic acids”
e3“root exudates”
The same questions in other papers
potassium · physiology: enzyme activity · Nicotiana tabacum (tobacco)Positive and negative results
3 papers in the same direction as this paper · 2 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
- positive
- no effect
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See all 6 papers →potassium · growth · Nicotiana tabacum (tobacco)Positive and negative results
6 papers in the same direction as this paper · 15 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
- positive
- positive
18 papers more in this group
See all 22 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.