Abstract
Regulation of root architecture is essential for maintaining plant growth under adverse environment. A synthetic abscisic acid (ABA)/stress-inducible promoter was designed to control the expression of a late embryogenesis abundant protein (HVA1) in transgenic rice. The background of HVA1 is low but highly inducible by ABA, salt, dehydration and cold. HVA1 was highly accumulated in root apical meristem (RAM) and lateral root primordia (LRP) after ABA/stress treatments, leading to enhanced root system expansion. Water-use efficiency (WUE) and biomass also increased in transgenic rice, likely due to the maintenance of normal cell functions and metabolic activities conferred by HVA1 which is capable of stabilizing proteins, under osmotic stress. HVA1 promotes lateral root (LR) initiation, elongation and emergence and primary root (PR) elongation via an auxin-dependent process, particularly by intensifying asymmetrical accumulation of auxin in LRP founder cells and RAM, even under ABA/stress-suppressive conditions. We demonstrate a successful application of an inducible promoter in regulating the spatial and temporal expression of HVA1 for improving root architecture and multiple stress tolerance without yield penalty.
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Claims 8
Claim · model-written summary
HVA1 expression was low at baseline but inducible by ABA, salt, dehydration, and cold.
- Taxon
- rice
Oryza sativat0 - Gene
- HVA1e0
- Outcome
- highly induciblee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The background of HVA1 is low but highly inducible by ABA, salt, dehydration and cold.”
t0“rice”
Claim · model-written summary
After ABA or stress treatment, HVA1 accumulated in root apical meristem and lateral root primordia.
- Taxon
- riceOryza sativat0
- Organ / stage
- root apical meristem (RAM) and lateral root primordia (LRP)e0
- Gene
- HVA1e0
- Outcome
- highly accumulatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HVA1 was highly accumulated in root apical meristem (RAM) and lateral root primordia (LRP) after ABA/stress treatments”
t0“rice”
Claim · model-written summary
ABA or stress induced HVA1 enhanced root system expansion.
- Taxon
- riceOryza sativat0
- Treatment
- ABA/stress treatmentse0
- Outcome
- root system expansione0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after ABA/stress treatments, leading to enhanced root system expansion.”
t0“rice”
Claim · model-written summary
Transgenic rice had increased water-use efficiency.
- Taxon
- riceOryza sativae0
- Treatment
- transgenic ricee0
- Outcome
- Water-use efficiency (WUE)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water-use efficiency (WUE) and biomass also increased in transgenic rice”
Claim · model-written summary
Transgenic rice had increased biomass.
- Taxon
- riceOryza sativae0
- Treatment
- transgenic ricee0
- Outcome
- biomasse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water-use efficiency (WUE) and biomass also increased in transgenic rice”
Claim · model-written summary
HVA1 promotes lateral root initiation, elongation, and emergence and primary root elongation via auxin.
- Taxon
- riceOryza sativat0
- Gene
- HVA1e0
- Outcome
- lateral root (LR) initiation, elongation and emergencee0
- Qualifier
- auxin-dependent processe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HVA1 promotes lateral root (LR) initiation, elongation and emergence and primary root (PR) elongation via an auxin-dependent process”
t0“rice”
Claim · model-written summary
HVA1 intensified asymmetric auxin accumulation in founder cells and root apical meristem.
- Taxon
- riceOryza sativat0
- Outcome
- asymmetrical accumulation of auxine0
- Qualifier
- ABA/stress-suppressive conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“intensifying asymmetrical accumulation of auxin in LRP founder cells and RAM, even under ABA/stress-suppressive conditions.”
t0“rice”
Claim · model-written summary
Inducible HVA1 expression improved multiple stress tolerance without yield penalty.
- Taxon
- riceOryza sativat0
- Treatment
- expression of HVA1e0
- Outcome
- multiple stress tolerancee0
- Direction
- improvinge0
- Qualifier
- without yield penaltye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“regulating the spatial and temporal expression of HVA1 for improving root architecture and multiple stress tolerance without yield penalty.”
t0“rice”
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