Abscisic Acid (ABA) mitigates drought stress in sunflower by enhancing water relations and osmotic adjustments

Drought stress significantly alters plant growth by disturbing plant water relations. Production and accumulation of compatible solutes improve plant water relations and help the plants to survive under water-limited conditions. Abscisic acid (ABA) could ameliorate the negative consequences of droug...

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Bibliographic Details
Published inPure and applied biology Vol. 10; no. 1; pp. 182 - 193
Main Author Hussain, Safdar
Format Journal Article
LanguageEnglish
Published Quetta International Society of Pure and Applied Biology 10.03.2021
Subjects
Abscisic acid
Accumulation
Agricultural production
Compatibility
Drought
Environmental impact
Growth stage
Helianthus
Plant growth
Seeds
Solutes
Stress
Sunflowers
Water deficit
Water relations
Pakistan
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Summary:Drought stress significantly alters plant growth by disturbing plant water relations. Production and accumulation of compatible solutes improve plant water relations and help the plants to survive under water-limited conditions. Abscisic acid (ABA) could ameliorate the negative consequences of drought stress. Therefore, this two-year field study was conducted to infer the role ABA application (0, 5 and 10 µM) at bud initiation (BBCH-51) and flower initiation (BBCH-55) in improving plant growth under water deficiency imposed at various growth stages. Drought stress was imposed at BBCH-51 and BBCH-55 by skipping irrigation, whereas a well-watered treatment was also included for comparison. The water relations, accumulation of compatible solutes and achene yield were significantly reduced by drought stress imposed at BBCH-51 and BBCH-55. The negative impacts of drought stress were more prominent at BBCH-55 than BBCH-51. Hence, BBCH-55 proved more sensitive growth stage to drought stress than BBCH-51. The ABA application under stress-free conditions significantly reduced achene yield, with more reduction with higher ABA level. The ABA application of 5 µM either at BBCH-51 or BBCH-55 improved plant water relations, accumulation of compatible solutes and achene yield under drought stress whereas 10 µM ABA application was less effective. Therefore, it is recommended that 5 pM ABA application could ameliorate the negative impact of water deficit stress at BBCH-51 and BBCH-55 in sunflower.
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ISSN:2304-2478
2304-2478
DOI:10.19045/bspab.2021.100019