Abstract
The plant hormone Abscisic Acid (ABA) plays a crucial role in plant responses to drought and other abiotic stresses, facilitating adaptation mechanisms under water-deficit conditions. This study aimed to investigate the response of field pea (Pisum sativum) varieties to drought stress by evaluating ABA concentrations, stomatal conductance, and the expression of PsAO genes during the third leaf pair stage. Drought stress was simulated by withholding irrigation to impose moderate and severe levels of water deficit. A statistically significant increase in ABA concentration was observed in all tested pea varieties under stress conditions. Under moderate drought, stomatal responses varied among genotypes; however, severe drought triggered accelerated stomatal closure across all varieties. The cultivar Dukat exhibited the highest stomatal sensitivity, which corresponded with a tenfold increase in ABA concentration, suggesting a strong reliance on chemical (ABA-mediated) drought signalling. In contrast, Javor cultivar showed only a modest (2.5-fold) increase in ABA, despite reduced stomatal conductance, indicating a likely reliance on hydraulic signals for drought response. Gene expression analysis revealed that PsAO2 and PsAO3 genes were upregulated under drought, while PsAO1 expression remained relatively unchanged compared to the control plants. Notably, PsAO3 expression was consistently elevated under both moderate and severe drought, suggesting that this gene may play a central role in conferring drought tolerance in field pea. These findings highlight the importance of ABA biosynthesis and signalling, particularly via PsAO3, in the adaptation of pea plants to water-deficit conditions.
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Claims 13
Claim · model-written summary
ABA concentration increased significantly in all tested pea varieties under stress conditions.
- Taxon
- pea
Lathyrus oleraceuse0 - Treatment
- stress conditionse0
- Outcome
- ABA concentratione0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A statistically significant increase in ABA concentration was observed in all tested pea varieties under stress conditions”
Claim · model-written summary
Under moderate drought, stomatal responses varied among field pea genotypes.
Not reportedComparator
Verbatim
e0“Under moderate drought, stomatal responses varied among genotypes”
t0“Field Pea”
Claim · model-written summary
Severe drought triggered accelerated stomatal closure across all field pea varieties.
Not reportedComparator
Verbatim
e0“severe drought triggered accelerated stomatal closure across all varieties”
t0“Field Pea”
Claim · model-written summary
The cultivar Dukat exhibited the highest stomatal sensitivity.
Verbatim
e0“The cultivar Dukat exhibited the highest stomatal sensitivity, which corresponded with a tenfold increase in ABA concentration”
t0“Field Pea”
Claim · model-written summary
ABA concentration increased tenfold in the cultivar Dukat.
Verbatim
e0“The cultivar Dukat exhibited the highest stomatal sensitivity, which corresponded with a tenfold increase in ABA concentration”
t0“Field Pea”
Claim · model-written summary
The authors suggest Dukat has a strong reliance on chemical, ABA-mediated drought signalling.
Verbatim
e0“The cultivar Dukat exhibited the highest stomatal sensitivity, which corresponded with a tenfold increase in ABA concentration, suggesting a strong reliance on chemical (ABA-mediated) drought signalling”
t0“Field Pea”
Claim · model-written summary
The cultivar Javor showed only a modest 2.5-fold increase in ABA.
Verbatim
e0“Javor cultivar showed only a modest (2.5-fold) increase in ABA, despite reduced stomatal conductance, indicating a likely reliance on hydraulic signals for drought response”
t0“Field Pea”
Claim · model-written summary
The cultivar Javor showed reduced stomatal conductance.
Verbatim
e0“Javor cultivar showed only a modest (2.5-fold) increase in ABA, despite reduced stomatal conductance, indicating a likely reliance on hydraulic signals for drought response”
t0“Field Pea”
Claim · model-written summary
The authors indicate Javor likely relies on hydraulic signals for its drought response.
Verbatim
e0“Javor cultivar showed only a modest (2.5-fold) increase in ABA, despite reduced stomatal conductance, indicating a likely reliance on hydraulic signals for drought response”
t0“Field Pea”
Claim · model-written summary
PsAO2 and PsAO3 expression was upregulated under drought compared with control plants.
Verbatim
e0“PsAO2 and PsAO3 genes were upregulated under drought, while PsAO1 expression remained relatively unchanged compared to the control plants”
t0“Field Pea”
Claim · model-written summary
PsAO1 expression remained relatively unchanged under drought compared with control plants.
Verbatim
e0“PsAO2 and PsAO3 genes were upregulated under drought, while PsAO1 expression remained relatively unchanged compared to the control plants”
t0“Field Pea”
Claim · model-written summary
PsAO3 expression was consistently elevated under both moderate and severe drought.
- Taxon
- Field Peat0
- Treatment
- both moderate and severe droughte0
- Gene
- PsAO3e0
- Outcome
- expressione0
- Direction
- elevatede0
Not reportedComparator
Verbatim
e0“PsAO3 expression was consistently elevated under both moderate and severe drought”
t0“Field Pea”
Claim · model-written summary
The authors suggest PsAO3 may play a central role in conferring drought tolerance in field pea.
Verbatim
e0“PsAO3 expression was consistently elevated under both moderate and severe drought, suggesting that this gene may play a central role in conferring drought tolerance in field pea”
The same questions in other papers
drought · molecular: expression · Lathyrus oleraceus (pea)Positive and negative results
2 papers in the same direction as this paper · 4 in the opposite direction
- positive
- positive
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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.