Abstract
Plant roots are sensitive to potassium (K+) deficiency signals. Therefore, regulating root growth by exogenous methods is a vital strategy to improve low K+ tolerance of sweetpotato. We studied the effects of exogenous indole-3-acetic acid (IAA) on growth, K+ absorption, and root characteristics in sweetpotato exposed to low K+ treatment (LK). LK significantly inhibited dry mass, K+ concentration and accumulation, as well as the root elongation (length) and branching (forks and crossings) in sweetpotato seedlings. However, exogenous IAA increased the length, ratio, and density of lateral roots and promoted absorption and accumulation of K+, which effectively alleviated the inhibitory effect of low K+. Exogenous IAA also increased the expression levels of auxin synthesis (IbYUC6 and IbTAR2) and transport (IbPIN1, IbPIN3, and IbPIN8) genes in leaves and roots, which promoted the increase of endogenous IAA content. Furthermore, exogenous IAA was more effective on low-K-tolerant variety (XS32) than low-K-sensitive variety (NZ1) under LK stress, depending on their different IAA synthesis and transport strategies. These results indicated that exogenous IAA enhanced root responsiveness of sweetpotato to low K+ stress by modulating auxin biosynthesis and transport, thereby improving the tolerance of sweetpotato to low K+ stress.
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Claims 9
Claim · model-written summary
Low potassium inhibited sweetpotato seedling dry mass, potassium concentration and accumulation.
- Taxon
- sweetpotato
_Flower.jpg?width=60)
Ipomoea batatase0 - Organ / stage
- seedlingse0
- Treatment
- LKe0
- Outcome
- dry mass, K+ concentration and accumulatione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e0“LK significantly inhibited dry mass, K+ concentration and accumulation, as well as the root elongation (length) and branching (forks and crossings) in sweetpotato seedlings”
Claim · model-written summary
Low potassium inhibited sweetpotato root elongation and branching.
- Taxon
- sweetpotatoIpomoea batatase0
- Organ / stage
- roote0
- Treatment
- LKe0
- Outcome
- root elongation (length) and branching (forks and crossings)e0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“LK significantly inhibited dry mass, K+ concentration and accumulation, as well as the root elongation (length) and branching (forks and crossings) in sweetpotato seedlings”
Claim · model-written summary
Exogenous IAA increased sweetpotato lateral root length, ratio and density under low potassium.
- Taxon
- sweetpotatoIpomoea batatast0
- Organ / stage
- lateral rootse0
- Treatment
- exogenous IAAe0
- Outcome
- length, ratio, and density of lateral rootse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetpotato”
e0“exogenous IAA increased the length, ratio, and density of lateral roots and promoted absorption and accumulation of K+”
Claim · model-written summary
Exogenous IAA promoted sweetpotato potassium absorption and accumulation.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- exogenous IAAe0
- Outcome
- absorption and accumulation of K+e0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetpotato”
e0“exogenous IAA increased the length, ratio, and density of lateral roots and promoted absorption and accumulation of K+”
Claim · model-written summary
Exogenous IAA increased expression of IbYUC6 and IbTAR2 in sweetpotato leaves and roots.
- Taxon
- sweetpotatoIpomoea batatast0
- Organ / stage
- leaves and rootse0
- Treatment
- Exogenous IAAe0
- Gene
- IbYUC6 and IbTAR2e0
- Outcome
- expression levelse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetpotato”
e0“Exogenous IAA also increased the expression levels of auxin synthesis (IbYUC6 and IbTAR2) and transport (IbPIN1, IbPIN3, and IbPIN8) genes in leaves and roots”
Claim · model-written summary
Exogenous IAA increased expression of IbPIN1, IbPIN3 and IbPIN8 in sweetpotato leaves and roots.
- Taxon
- sweetpotatoIpomoea batatast0
- Organ / stage
- leaves and rootse0
- Treatment
- Exogenous IAAe0
- Gene
- IbPIN1, IbPIN3, and IbPIN8e0
- Outcome
- expression levelse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetpotato”
e0“Exogenous IAA also increased the expression levels of auxin synthesis (IbYUC6 and IbTAR2) and transport (IbPIN1, IbPIN3, and IbPIN8) genes in leaves and roots”
Claim · model-written summary
Exogenous IAA increased endogenous IAA content in sweetpotato.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- exogenous IAAe1
- Outcome
- endogenous IAA contente0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetpotato”
e0“which promoted the increase of endogenous IAA content”
e1“exogenous IAA increased the length, ratio, and density of lateral roots and promoted absorption and accumulation of K+”
Claim · model-written summary
Exogenous IAA was more effective in low-K-tolerant XS32 than low-K-sensitive NZ1 under low potassium stress.
- Taxon
- sweetpotatoIpomoea batatast0
- Material
- XS32e0
- Treatment
- exogenous IAAe0
- Outcome
- more effectivee0
- Direction
- more effectivee0
- Qualifier
- under LK stresse0
- Comparator
- low-K-sensitive variety (NZ1)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetpotato”
e0“exogenous IAA was more effective on low-K-tolerant variety (XS32) than low-K-sensitive variety (NZ1) under LK stress”
Claim · model-written summary
The authors infer that exogenous IAA improves low potassium tolerance through altered auxin biosynthesis and transport.
- Taxon
- sweetpotatoIpomoea batatase0
- Treatment
- exogenous IAAe0
- Outcome
- tolerance of sweetpotato to low K+ stresse0
- Qualifier
- modulating auxin biosynthesis and transporte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous IAA enhanced root responsiveness of sweetpotato to low K+ stress by modulating auxin biosynthesis and transport, thereby improving the tolerance of sweetpotato to low K+ stress”
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See all 27 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.