Abstract
1. New Perspective on the Relationship between K leaf and g s : This study offers a novel perspective by subdividing leaf hydraulic conductance ( K leaf ) into xylem inside ( K x ) and outside ( K ox ), elucidating the regulatory mechanisms of K leaf on stomatal conductance ( g s ). 2. Optimizing Planting Density to Enhance Water Use Efficiency: The research reveals that K ox is significantly positively correlated with g s , allowing cotton to reduce water loss while maintaining photosynthetic rate ( A N ), thereby improving water use efficiency (WUE) across various planting densities. 3. Structural Basis and Influencing Factors of K ox : K ox is significantly influenced by leaf thickness and the volume fraction of inter-cellular air space, with a notable negative correlation with WUE as planting density increases, highlighting the importance of changes in leaf hydraulic properties for effective water management. Hydraulic theory predicts a positive coupling between leaf hydraulic conductance ( K leaf ) and stomatal conductance ( g s ); however, this theory has not been fully supported by observations, and the underlying mechanisms remain unclear. Currently, subdividing K leaf into leaf hydraulic conductance inside xylem ( K x ) and outside xylem ( K ox ) offers a new perspective for elucidating the regulatory mechanism of K leaf on g s . Optimal planting density can enhance water use efficiency (WUE) by optimizing g s ; however, the changes in leaf hydraulic properties during this process and its regulation of g s and WUE remain unclear. We examined the relationships between K x and K ox with g s , photosynthetic rate ( A N ), and WUE, and investigated the structural basis determining K ox in cotton under eight planting densities of 12, 18, 24, 36, 48, 60, 72, and 84 plant m - ². The results showed that as the increase of planting density, K leaf and A N remained consistent while K ox and g s decreased significantly. K ox was significantly influenced by leaf thickness and the volume fraction of inter-cellular air space. K leaf and K x showed no correlation with A N or g s , but K ox exhibited a significant positive correlation with g s . Furthermore, K ox is significantly negatively correlated with WUE. These findings suggest that K ox modulates g s to reduce water loss while maintaining A N , thereby enhancing WUE in cotton under various planting densities.
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Claims 7
Claim · model-written summary
K ox is significantly positively correlated with g s in cotton.
- Taxon
- cotton
Gossypium hirsutumt0 - Treatment
- various planting densitiese1
- Outcome
- g se0
- Direction
- positively correlatede0
- Qualifier
- K oxe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton across different planting densities”
e0“K ox is significantly positively correlated with g s”
e1“enhancing WUE in cotton under various planting densities”
Claim · model-written summary
K leaf and K x showed no correlation with A N or g s in cotton.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- various planting densitiese1
- Outcome
- A N or g se2
- Direction
- no correlatione2
- Qualifier
- K leaf and K xe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton across different planting densities”
e1“enhancing WUE in cotton under various planting densities”
e2“K leaf and K x showed no correlation with A N or g s”
Claim · model-written summary
Increasing planting density significantly decreased K ox and g s in cotton.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- the increase of planting densitye3
- Outcome
- K ox and g se3
- Direction
- decreased significantlye3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton across different planting densities”
e3“as the increase of planting density, K leaf and A N remained consistent while K ox and g s decreased significantly”
Claim · model-written summary
Increasing planting density left K leaf and A N consistent in cotton.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- the increase of planting densitye3
- Outcome
- K leaf and A Ne3
- Direction
- remained consistente3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton across different planting densities”
e3“as the increase of planting density, K leaf and A N remained consistent while K ox and g s decreased significantly”
Claim · model-written summary
K ox in cotton was significantly influenced by leaf thickness and the volume fraction of inter-cellular air space.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- leaf thickness and the volume fraction of inter-cellular air spacee4
- Outcome
- K oxe4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton across different planting densities”
e4“K ox was significantly influenced by leaf thickness and the volume fraction of inter-cellular air space”
Claim · model-written summary
K ox in cotton is significantly negatively correlated with WUE.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- K oxe5
- Outcome
- WUEe5
- Direction
- negatively correlatede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton across different planting densities”
e5“K ox is significantly negatively correlated with WUE”
Claim · model-written summary
K ox appears to modulate g s to reduce water loss while maintaining A N, thereby enhancing WUE in cotton.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- WUEe6
- Qualifier
- K ox modulates g s to reduce water loss while maintaining A Ne6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton across different planting densities”
e6“K ox modulates g s to reduce water loss while maintaining A N , thereby enhancing WUE”
The same questions in other papers
density · physiology: photosynthesis · Gossypium hirsutum (cotton)Positive and negative results
4 papers in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
5 papers more in this group
See all 9 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.