Abstract
Abstract High relative humidity (RH) perturbs plant growth, stomatal functioning and abscisic acid (ABA) homeostasis, but the role of ABA in this physiological regulation is equivocal. To determine the role(s) of ABA in plant responses to high RH, wild‐type (WT) tomato and barley plants and their respective ABA‐deficient mutants flacca and Az34 (which are mutated in the same locus of the ABA biosynthesis pathway) were grown in contrasting RHs (60% and 90%) to measure biomass partitioning, stomatal traits and water relations. Surprisingly, growth RH did not affect foliar ABA levels in either species. While Az34 showed similar stomatal size and density as WT plants, flacca had larger and more abundant stomata. High RH increased stomatal size in tomato, but decreased it in barley, and decreased stomatal density in tomato, but not in barley. Altered stomatal responses in ABA‐deficient plants to high RH had little effect on tomato photosynthesis, but Az34 barley showed lower photosynthesis. ABA deficiency decreased relative shoot growth rate (RGR SHOOT ) in both species, yet this was counteracted by high RH increasing leaf water status in tomato, but not in barley. High RH increased RGR SHOOT in flacca , but not in WT tomatoes, while having no effect on RGR SHOOT in barley, but affecting barley net assimilation rate, leaf area ratio (LAR) and specific leaf area in an ABA‐dependent manner. ABA‐RH interaction affected leaf development in tomato only. Thus, different crop species show variable responses to both high RH and ABA deficiency, making it difficult to generalise on the role of ABA in growth regulation at contrasting RHs.
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Claims 12
Claim · model-written summary
Growth humidity did not affect foliar ABA levels in tomato or barley.
Not reportedTaxonComparator
Verbatim
e0“growth RH did not affect foliar ABA levels in either species.”
Claim · model-written summary
The flacca mutant had larger and more abundant stomata than wild type tomato.
Not reportedTaxon
Verbatim
e0“flacca had larger and more abundant stomata.”
Claim · model-written summary
High humidity increased stomatal size in tomato.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- High RHe0
- Outcome
- stomatal sizee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High RH increased stomatal size in tomato”
Claim · model-written summary
High humidity decreased stomatal size in barley.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree0 - Direction
- decreasede0
Not reportedTreatmentComparatorOutcome
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“decreased it in barley”
Claim · model-written summary
High humidity decreased stomatal density in tomato.
- Taxon
- tomatoSolanum lycopersicume0
- Outcome
- stomatal densitye0
- Direction
- decreasede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased stomatal density in tomato”
Claim · model-written summary
High humidity did not decrease stomatal density in barley.
- Taxon
- barleyHordeum vulgaree0
- Outcome
- stomatal densitye0
- Direction
- note0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased stomatal density in tomato, but not in barley.”
Claim · model-written summary
ABA-deficient Az34 barley had lower photosynthesis.
- Taxon
- barleyHordeum vulgaree0
- Material
- Az34e0
- Outcome
- photosynthesise0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Az34 barley showed lower photosynthesis.”
Claim · model-written summary
ABA deficiency decreased relative shoot growth rate in tomato and barley.
Not reportedTaxonComparator
Verbatim
e0“ABA deficiency decreased relative shoot growth rate (RGR SHOOT ) in both species”
Claim · model-written summary
High humidity increased leaf water status in tomato.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- high RHe0
- Outcome
- leaf water statuse0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high RH increasing leaf water status in tomato”
Claim · model-written summary
High humidity increased shoot relative growth rate in flacca tomato.
Not reportedTaxonComparator
Verbatim
e0“High RH increased RGR SHOOT in flacca”
Claim · model-written summary
High humidity did not affect shoot growth rate in barley.
- Taxon
- barleyHordeum vulgaree0
- Outcome
- RGR SHOOTe0
- Direction
- no effecte0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“having no effect on RGR SHOOT in barley”
Claim · model-written summary
The ABA and humidity interaction affected leaf development in tomato only.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- ABA‐RH interactione0
- Outcome
- leaf developmente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ABA‐RH interaction affected leaf development in tomato only.”
The same questions in other papers
humidity · physiology: water · Solanum lycopersicum (tomato)Positive and negative results
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See all 7 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.