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- W2891536062 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." @default.
- W2891536062 created "2018-09-27" @default.
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- W2891536062 date "2018-11-14" @default.
- W2891536062 modified "2023-10-16" @default.
- W2891536062 title "Independent and combined abiotic stresses affect the physiology and expression patterns of DREB genes differently in stress‐susceptible and resistant genotypes of banana" @default.
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- W2891536062 doi "https://doi.org/10.1111/ppl.12837" @default.
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