Abstract
Increasing evidence suggests that nocturnal transpiration rate ( TR N ) is a non‐negligible contributor to global water cycles. Short‐term variation in nocturnal vapor pressure deficit ( VPD N ) has been suggested to be a key environmental variable influencing TR N . However, the long‐term effects of VPD N on plant growth and development remain unknown, despite recent evidence documenting long‐term effects of daytime VPD on plant anatomy, growth and productivity. Here we hypothesized that plant anatomical and functional traits influencing leaf and root hydraulics could be influenced by long‐term exposure to VPD N . A total of 23 leaf and root traits were examined on four wheat ( Triticum aestivum ) genotypes, which were subjected to two long‐term (30 day long) growth experiments where daytime VPD and daytime/nighttime temperature regimes were kept identical, with variation only stemming from VPD N , imposed at two levels (0.4 and 1.4 kPa ). The VPD N treatment did not influence phenology, leaf areas, dry weights, number of tillers or their dry weights, consistently with a drought and temperature‐independent treatment. In contrast, vein densities, adaxial stomata densities, TR N and cuticular TR , were strongly increased following exposure to high VPD N . Simultaneously, whole‐root system xylem sap exudation and seminal root endodermis thickness were decreased, hypothetically indicating a change in root hydraulic properties. Overall these results suggest that plants ‘sense’ and adapt to variations in VPD N conditions over developmental scales by optimizing both leaf and root hydraulics.
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Claims 4
Claim · model-written summary
High nighttime VPD did not influence wheat phenology or growth traits.
- Taxon
- wheat
Triticum aestivume1 - Treatment
- VPD N treatmente0
- Outcome
- phenology, leaf areas, dry weights, number of tillers or their dry weightse0
- Direction
- did not influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The VPD N treatment did not influence phenology, leaf areas, dry weights, number of tillers or their dry weights”
e1“four wheat ( Triticum aestivum ) genotypes”
Claim · model-written summary
High nighttime VPD increased wheat vein densities, adaxial stomata densities, nocturnal transpiration and cuticular transpiration.
- Taxon
- wheatTriticum aestivume1
- Treatment
- high VPD Ne0
- Outcome
- vein densities, adaxial stomata densities, TR N and cuticular TRe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“vein densities, adaxial stomata densities, TR N and cuticular TR , were strongly increased following exposure to high VPD N”
e1“four wheat ( Triticum aestivum ) genotypes”
Claim · model-written summary
High nighttime VPD decreased wheat whole-root xylem sap exudation and seminal-root endodermis thickness.
- Taxon
- wheatTriticum aestivume1
- Treatment
- high VPD Ne2
- Outcome
- whole‐root system xylem sap exudation and seminal root endodermis thicknesse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whole‐root system xylem sap exudation and seminal root endodermis thickness were decreased”
e1“four wheat ( Triticum aestivum ) genotypes”
e2“exposure to high VPD N”
Claim · model-written summary
The authors suggest wheat adapts its leaf and root hydraulics to nighttime VPD over developmental timescales.
- Taxon
- wheatTriticum aestivume1
- Outcome
- leaf and root hydraulicse0
- Qualifier
- variations in VPD N conditions over developmental scalese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants ‘sense’ and adapt to variations in VPD N conditions over developmental scales by optimizing both leaf and root hydraulics”
e1“four wheat ( Triticum aestivum ) genotypes”
The same questions in other papers
nitrogen · quality: phytochemicals · Triticum aestivum (wheat)Results differ
3 papers in the same direction as this paper · 9 in the opposite direction
- positive
- positive
- positive
9 papers more in this group
See all 13 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.