Abstract
Abstract Drought is one of the major stress factors in wheat production on a global scale. Drought priming during the early growth stage can enhance drought tolerance in wheat ( Triticum aestivum L.). Abscisic acid (ABA) and hydrogen peroxide (H 2 O 2 ) are important signal molecules in the adaptation of plants to drought stress. However, the roles of ABA and H 2 O 2 in drought priming‐induced drought tolerance are not clear. In the present study, we evaluated the responses of wheat to an ABA inhibitor, H 2 O 2 scavenger and an inhibitor to investigate the (i) relationship between ABA and H 2 O 2 in osmotic adjustment after drought priming in the vegetative stage and (ii) responses to drought stress during grain filling. In the drought priming alone treatments, chemical application resulted in the scavenging of ABA and H 2 O 2 , weakening the alleviation effects of drought priming on drought stress, as demonstrated by the lower leaf water potential and grain yield. The ABA inhibitor completely inhibited accumulation of ABA and H 2 O 2 ; the ABA inhibitor inhibited respiratory burst oxidase homologue expression, whereas the H 2 O 2 inhibitor resulted in higher 9‐cis‐epoxycarotenoid dioxygenase expression and ABA concentration in primed plants, indicating that ABA scavenging inhibited H 2 O 2 biosynthesis while H 2 O 2 scavenging did not inhibit ABA biosynthesis. The results further demonstrated that NADPH oxidase‐mediated H 2 O 2 production functions downstream of ABA, which induces osmolyte transcript expression and accumulation, and thus contributes to drought priming‐induced stress tolerance. These results provide a theoretical basis for a better understanding of the mechanisms involved in drought priming‐induced tolerance in wheat plants.
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Claims 11
Claim · model-written summary
Chemical scavenging of ABA and hydrogen peroxide weakened drought priming protection, lowering leaf water potential.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- chemical applicatione0
- Outcome
- leaf water potentiale0
- Direction
- lowere0
- Comparator
- drought priming alone treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the drought priming alone treatments, chemical application resulted in the scavenging of ABA and H 2 O 2 , weakening the alleviation effects of drought priming on drought stress, as demonstrated by the lower leaf water potential and grain yield”
t0“wheat”
Claim · model-written summary
Chemical scavenging of ABA and hydrogen peroxide lowered grain yield after drought priming.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- chemical applicatione0
- Outcome
- grain yielde0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chemical application resulted in the scavenging of ABA and H 2 O 2 , weakening the alleviation effects of drought priming on drought stress, as demonstrated by the lower leaf water potential and grain yield”
t0“wheat”
Claim · model-written summary
ABA inhibitor completely inhibited ABA accumulation.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- ABA inhibitore0
- Outcome
- accumulation of ABAe0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ABA inhibitor completely inhibited accumulation of ABA and H 2 O 2”
t0“wheat”
Claim · model-written summary
ABA inhibitor completely inhibited hydrogen peroxide accumulation.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- ABA inhibitore0
- Outcome
- accumulation of ABA and H 2 O 2e0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ABA inhibitor completely inhibited accumulation of ABA and H 2 O 2”
t0“wheat”
Claim · model-written summary
ABA inhibitor inhibited respiratory burst oxidase homologue expression.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- ABA inhibitore0
- Outcome
- respiratory burst oxidase homologue expressione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the ABA inhibitor inhibited respiratory burst oxidase homologue expression”
t0“wheat”
Claim · model-written summary
Hydrogen peroxide inhibitor increased 9‐cis‐epoxycarotenoid dioxygenase expression in primed plants.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- H 2 O 2 inhibitore0
- Outcome
- 9‐cis‐epoxycarotenoid dioxygenase expressione0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the H 2 O 2 inhibitor resulted in higher 9‐cis‐epoxycarotenoid dioxygenase expression and ABA concentration in primed plants”
t0“wheat”
Claim · model-written summary
Hydrogen peroxide inhibitor increased ABA concentration in primed plants.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- H 2 O 2 inhibitore0
- Outcome
- ABA concentratione0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the H 2 O 2 inhibitor resulted in higher 9‐cis‐epoxycarotenoid dioxygenase expression and ABA concentration in primed plants”
t0“wheat”
Claim · model-written summary
ABA scavenging inhibited hydrogen peroxide biosynthesis.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- ABA scavenginge0
- Outcome
- H 2 O 2 biosynthesise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ABA scavenging inhibited H 2 O 2 biosynthesis”
t0“wheat”
Claim · model-written summary
Hydrogen peroxide scavenging did not inhibit ABA biosynthesis.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- H 2 O 2 scavenginge0
- Outcome
- ABA biosynthesise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“H 2 O 2 scavenging did not inhibit ABA biosynthesis”
t0“wheat”
Claim · model-written summary
NADPH oxidase mediated hydrogen peroxide production functions downstream of ABA.
- Taxon
- wheatTriticum aestivumt0
- Gene
- NADPH oxidasee0
- Compound
- ABAe0
- Outcome
- H 2 O 2 productione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NADPH oxidase‐mediated H 2 O 2 production functions downstream of ABA”
t0“wheat”
Claim · model-written summary
Downstream hydrogen peroxide induces osmolyte transcript expression and accumulation, contributing to drought priming tolerance.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- osmolyte transcript expression and accumulatione0
- Qualifier
- drought priming‐induced stress tolerancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which induces osmolyte transcript expression and accumulation, and thus contributes to drought priming‐induced stress tolerance”
t0“wheat”
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