Abstract
Cd ions are absorbed and transported from the soil by crop roots, which are the first organ to be exposed to Cd. This results in an increase in cadmium ions in crops, significantly affecting crop growth and yield. Exogenous melatonin (MT) can help reduce cadmium (Cd) stress in cotton, but the specific contribution of roots to this process remains unclear. In order to address this knowledge gap, an in-situ root phenotyping study was conducted to investigate the the phenotype and lifespan of roots under cadmium stress (Cd) and melatonin treatment (Cd + MT). The results showed that MT alleviated the decreases in plant height, leaf area, SPAD value, stem diameter, stomatal conductance and net photosynthetic rate under Cd stress, which further promoted the biomass accumulation in various cotton organs. What is more, the Cd + MT treatment increased root volume, surface area, and length under Cd stress by 25.63 %, 10.58 %, and 21.89 %, respectively, compared with Cd treatment. Interestingly, compared to Cd treatment, Cd + MT treatment also significantly extended the lifespan of roots and root hairs by 6.68 days and 2.18 days, respectively. In addition, Cd + MT treatment reduced the transport of Cd from roots to shoots, particularly to bolls, and decreased the Cd bioconcentration factor in bolls by 61.17 %, compared to Cd treatment. In conclusion, these findings show that applying MT externally helps reduce Cd stress by delaying root senescence, promoting root development and regulating Cd transport. This method can be an effective approach to managing Cd stress in cotton.
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Claims 9
Claim · model-written summary
Melatonin alleviated decreases in plant height, leaf area and stem diameter under cadmium stress.
- Taxon
- cotton
Gossypium hirsutumt0 - Treatment
- MTe0
- Outcome
- plant height, leaf area, SPAD value, stem diameter, stomatal conductance and net photosynthetic ratee0
- Direction
- alleviated the decreasese0
- Comparator
- Cd stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e0“MT alleviated the decreases in plant height, leaf area, SPAD value, stem diameter, stomatal conductance and net photosynthetic rate under Cd stress”
Claim · model-written summary
Melatonin promoted biomass accumulation in cotton organs.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- MTe1
- Outcome
- biomass accumulatione0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e0“which further promoted the biomass accumulation in various cotton organs”
e1“MT alleviated the decreases in plant height, leaf area, SPAD value, stem diameter, stomatal conductance and net photosynthetic rate under Cd stress”
Claim · model-written summary
Melatonin increased root volume under cadmium stress by 25.63%.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- Cd + MT treatmente0
- Outcome
- root volumee0
- Direction
- increasede0
- Value
- 25.63 %e0
- Comparator
- Cd treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e0“Cd + MT treatment increased root volume, surface area, and length under Cd stress by 25.63 %, 10.58 %, and 21.89 %, respectively, compared with Cd treatment”
Claim · model-written summary
Melatonin increased root surface area under cadmium stress by 10.58%.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- Cd + MT treatmente0
- Outcome
- surface areae0
- Direction
- increasede0
- Value
- 10.58 %e0
- Comparator
- Cd treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e0“Cd + MT treatment increased root volume, surface area, and length under Cd stress by 25.63 %, 10.58 %, and 21.89 %, respectively, compared with Cd treatment”
Claim · model-written summary
Melatonin increased root length under cadmium stress by 21.89%.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- Cd + MT treatmente0
- Outcome
- lengthe0
- Direction
- increasede0
- Value
- 21.89 %e0
- Comparator
- Cd treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e0“Cd + MT treatment increased root volume, surface area, and length under Cd stress by 25.63 %, 10.58 %, and 21.89 %, respectively, compared with Cd treatment”
Claim · model-written summary
Melatonin extended root lifespan by 6.68 days.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- Cd + MT treatmente0
- Outcome
- lifespan of rootse0
- Direction
- extendede0
- Value
- 6.68 dayse0
- Comparator
- Cd treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e0“compared to Cd treatment, Cd + MT treatment also significantly extended the lifespan of roots and root hairs by 6.68 days and 2.18 days, respectively”
Claim · model-written summary
Melatonin extended root hair lifespan by 2.18 days.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- Cd + MT treatmente0
- Outcome
- lifespan of roots and root hairse0
- Direction
- extendede0
- Value
- 2.18 dayse0
- Comparator
- Cd treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e0“compared to Cd treatment, Cd + MT treatment also significantly extended the lifespan of roots and root hairs by 6.68 days and 2.18 days, respectively”
Claim · model-written summary
Melatonin reduced cadmium transport from roots to shoots, particularly bolls.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- Cd + MT treatmente0
- Outcome
- transport of Cd from roots to shootse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e0“Cd + MT treatment reduced the transport of Cd from roots to shoots, particularly to bolls”
Claim · model-written summary
Melatonin decreased the cadmium bioconcentration factor in bolls by 61.17%.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- MTe1
- Outcome
- Cd bioconcentration factor in bollse0
- Direction
- decreasede0
- Value
- 61.17 %e0
- Comparator
- Cd treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e0“decreased the Cd bioconcentration factor in bolls by 61.17 %, compared to Cd treatment”
e1“MT alleviated the decreases in plant height, leaf area, SPAD value, stem diameter, stomatal conductance and net photosynthetic rate under Cd stress”
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See all 14 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.