Abstract
In tropics, combined stresses of drought and heat often reduce crop productivity in plants like Musa acuminata L. We compared responses of two contrasting banana genotypes, namely the drought‐sensitive Grand Nain (GN; AAA genome) and drought tolerant Hill banana (HB; AAB genome) to individual drought, heat and their combination under controlled and field conditions. Drought and combined drought and heat treatments caused greater reduction in leaf relative water content and greater increase in ion leakage and H 2 O 2 content in GN plants, especially in early stages, while the responses were more pronounced in HB at later stages. A combination of drought and heat increased the severity of responses. Real‐time expression patterns of the A‐1 and A‐2 group DEHYDRATION‐RESPONSIVE ELEMENT BINDING (DREB) genes revealed greater changes in expression in leaves of HB plants for both the individual stresses under controlled conditions compared to GN plants. A combination of heat and drought, however, activated most DREB genes in GN but surprisingly suppressed their expression in HB in controlled and field conditions. Its response seems correlated to a better stomatal control over transpiration in HB and a DREB‐independent pathway for the more severe combined stresses unlike in GN. Most of the DREB genes had abscisic acid (ABA)‐responsive elements in their promoters and were also activated by ABA suggesting at least partial dependence on ABA. This study provides valuable information on physiological and molecular responses of the two genotypes to individual and combined drought and heat stresses.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
Drought and combined drought and heat reduced leaf relative water content more in Grand Nain banana.
- Taxon
- bananat0
- Material
- GNe0
- Organ / stage
- leafe0
- Treatment
- Drought and combined drought and heat treatmentse0
- Outcome
- leaf relative water contente0
- Direction
- greater reductione0
- Qualifier
- especially in early stagese0
Not reportedComparator
Verbatim
t0“resistant genotypes of banana”
e0“Drought and combined drought and heat treatments caused greater reduction in leaf relative water content and greater increase in ion leakage and H 2 O 2 content in GN plants, especially in early stages, while the responses were more pronounced in HB at later stages”
Claim · model-written summary
Drought and combined drought and heat increased ion leakage and H2O2 content more in Grand Nain banana.
- Taxon
- bananat0
- Material
- GNe0
- Treatment
- Drought and combined drought and heat treatmentse0
- Outcome
- ion leakage and H 2 O 2 contente0
- Direction
- greater increasee0
- Qualifier
- especially in early stagese0
Not reportedComparator
Verbatim
t0“resistant genotypes of banana”
e0“Drought and combined drought and heat treatments caused greater reduction in leaf relative water content and greater increase in ion leakage and H 2 O 2 content in GN plants, especially in early stages, while the responses were more pronounced in HB at later stages”
Claim · model-written summary
In Hill banana (HB) the responses to drought and combined stress were more pronounced at later stages.
- Taxon
- bananat0
- Material
- HBe0
- Treatment
- Drought and combined drought and heat treatmentse0
- Outcome
- responsese0
- Direction
- more pronouncede0
- Qualifier
- at later stagese0
Not reportedComparator
Verbatim
t0“resistant genotypes of banana”
e0“Drought and combined drought and heat treatments caused greater reduction in leaf relative water content and greater increase in ion leakage and H 2 O 2 content in GN plants, especially in early stages, while the responses were more pronounced in HB at later stages”
Claim · model-written summary
Combined drought and heat increased the severity of responses in banana.
- Taxon
- bananat0
- Treatment
- A combination of drought and heate1
- Outcome
- severity of responsese1
- Direction
- increasede1
Not reportedComparator
Verbatim
t0“resistant genotypes of banana”
e1“A combination of drought and heat increased the severity of responses”
Claim · model-written summary
Individual drought or heat produced greater DREB gene expression changes in Hill banana leaves than in Grand Nain under controlled conditions.
Verbatim
t0“resistant genotypes of banana”
e2“revealed greater changes in expression in leaves of HB plants for both the individual stresses under controlled conditions compared to GN plants”
e3“A combination of heat and drought, however, activated most DREB genes in GN but surprisingly suppressed their expression in HB in controlled and field conditions”
Claim · model-written summary
Combined heat and drought activated most DREB genes in Grand Nain banana.
- Taxon
- bananat0
- Material
- GNe3
- Treatment
- combination of heat and droughte3
- Gene
- DREBe3
- Outcome
- most DREB genese3
- Direction
- activatede3
- Setting
- controlled and field conditionse3
Not reportedComparator
Verbatim
t0“resistant genotypes of banana”
e3“A combination of heat and drought, however, activated most DREB genes in GN but surprisingly suppressed their expression in HB in controlled and field conditions”
Claim · model-written summary
Combined heat and drought suppressed DREB gene expression in Hill banana under controlled and field conditions.
- Taxon
- bananat0
- Material
- HBe3
- Treatment
- combination of heat and droughte3
- Gene
- DREBe3
- Outcome
- their expressione3
- Direction
- suppressede3
- Setting
- controlled and field conditionse3
Not reportedComparator
Verbatim
t0“resistant genotypes of banana”
e3“A combination of heat and drought, however, activated most DREB genes in GN but surprisingly suppressed their expression in HB in controlled and field conditions”
Claim · model-written summary
The response of Hill banana seems linked to better stomatal control over transpiration.
Verbatim
t0“resistant genotypes of banana”
e4“Its response seems correlated to a better stomatal control over transpiration in HB”
Claim · model-written summary
DREB genes in banana were activated by ABA, suggesting at least partial ABA dependence.
Not reportedComparator
Verbatim
t0“resistant genotypes of banana”
e5“were also activated by ABA suggesting at least partial dependence on ABA”
e6“Most of the DREB genes had abscisic acid (ABA)”
The same questions in other papers
heat · physiology: oxidative · MusaPositive and negative results
2 in the opposite direction
- positive
- positive
drought · physiology: water · MusaPositive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
heat · disease · MusaPositive and negative results
1 paper in the same direction as this paper · 11 in the opposite direction
- positive
- positive
- positive
9 papers more in this group
See all 13 papers →drought · disease · MusaResults agree
1 paper in the same direction as this paper
- negative
drought · physiology: oxidative · MusaResults agree
2 papers in the same direction as this paper
- negative
- negative
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.