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Stomatal behaviour and endogenous phytohormones promotes intrinsic water use efficiency differently in cotton under drought

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Title Stomatal behaviour and endogenous phytohormones promotes intrinsic water use efficiency differently in cotton under drought
 
Creator Dubey, Raghvendra
Dudhagi, Shivanand Suresh
Narayan, Shiv
Kumar, Anil
Niranjan, Abhishek
Shirke, Pramod Arvind
 
Subject 6-Benzylaminopurine
Abiotic stress
Abscisic acid
Carbon isotope discrimination
Gossypium hirsutum
Stomatal conductance
Water deficit
 
Description 112-120
The coordination between phytohormones regulation, stomatal behaviour (stomatal index and opening/closing) and gas
exchange are potent determinants of plant survival under drought stress. However, we found a knowledge gap in the
mechanism regulating the fine-tuning of these features during drought. In order to address this we evaluated gas exchange,
stomatal behaviour and endogenous phytohormones content in two cotton varieties (LRA-5166 and NBRI-67) differing in
drought sensitivity during water deficit conditions. Variety specific differences were recorded in net photosynthesis rate (A),
transpiration rate (E) and stomatal conductance (gs) with significantly less decrease in drought tolerant LRA-5166 than
drought sensitive NBRI-67. The abscisic acid (ABA) accumulation was significantly increased in LRA-5166 while reduced
in NBRI-67 under water deficit, which was accompanied by relatively less reduced 6-benzylaminopurine (6-BAP) level in
LRA-5166 than NBRI-67.Thus, improved ABA/6-BAP ratio was observed in both the varieties of cotton. Critically, LRA-
5166 has reduced stomatal index, aperture size and significantly higher A and intrinsic water use efficiency (WUEi), thus
higher drought tolerance than NBRI-67. Furthermore, we found that endogenous ABA predominantly maintains the stomatal
behaviour and regulates its physiology either by antagonizing 6-BAP or alone to coordinate with water deficit signals.
Overall, our findings describe a new insight as to how drought modulates endogenous ABA and 6-BAP homeostasis in
cotton leaf and the mechanism of stomatal regulation by ABA and 6-BAP in cotton.
 
Date 2022-01-31T11:11:22Z
2022-01-31T11:11:22Z
2022-02
 
Type Article
 
Identifier 0975-1009 (Online); 0019-5189 (Print)
http://nopr.niscair.res.in/handle/123456789/59005
 
Language en
 
Publisher NIScPR-CSIR, India
 
Source IJEB Vol.60(02) [Feb 2022]