Abstract
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 M) 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 M either at BBCH-51 or BBCH-55 improved plant water relations, accumulation of compatible solutes and achene yield under drought stress whereas 10 M ABA application was less effective. Therefore, it is recommended that 5 M ABA application could ameliorate the negative impact of water deficit stress at BBCH-51 and BBCH-55 in sunflower.
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Claims 7
Claim · model-written summary
Drought at BBCH-51 and BBCH-55 significantly reduced sunflower water relations and compatible solutes.
- Taxon
- sunflower
Helianthus annuust0 - Treatment
- drought stress imposed at BBCH-51 and BBCH-55e0
- Outcome
- water relations, accumulation of compatible solutese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The water relations, accumulation of compatible solutes and achene yield were significantly reduced by drought stress imposed at BBCH-51 and BBCH-55”
t0“sunflower”
Claim · model-written summary
Drought at BBCH-51 and BBCH-55 significantly reduced sunflower achene yield.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- drought stress imposed at BBCH-51 and BBCH-55e0
- Outcome
- achene yielde0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The water relations, accumulation of compatible solutes and achene yield were significantly reduced by drought stress imposed at BBCH-51 and BBCH-55”
t0“sunflower”
Claim · model-written summary
Drought impacts were more pronounced at BBCH-55 than BBCH-51.
- Taxon
- sunflowerHelianthus annuust0
- Organ / stage
- BBCH-55e0
- Outcome
- negative impacts of drought stresse0
- Direction
- more prominente0
- Comparator
- BBCH-51e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The negative impacts of drought stress were more prominent at BBCH-55 than BBCH-51”
t0“sunflower”
Claim · model-written summary
ABA under stress-free conditions significantly reduced achene yield, with greater reduction at higher ABA level.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- ABA applicatione0
- Outcome
- achene yielde0
- Direction
- reducede0
- Qualifier
- more reduction with higher ABA levele0
- Comparator
- stress-free conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ABA application under stress-free conditions significantly reduced achene yield, with more reduction with higher ABA level”
t0“sunflower”
Claim · model-written summary
5 M ABA at either stage improved sunflower water relations and compatible solute accumulation under drought.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- ABA application of 5 Me0
- Outcome
- plant water relations, accumulation of compatible solutese0
- Direction
- improvede0
- Qualifier
- either at BBCH-51 or BBCH-55e0
- Comparator
- 10 M ABA applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ABA application of 5 M either at BBCH-51 or BBCH-55 improved plant water relations, accumulation of compatible solutes and achene yield under drought stress whereas 10 M ABA application was less effective”
t0“sunflower”
Claim · model-written summary
5 M ABA at either stage improved sunflower achene yield under drought.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- ABA application of 5 Me0
- Outcome
- achene yielde0
- Direction
- improvede0
- Qualifier
- either at BBCH-51 or BBCH-55e0
- Comparator
- 10 M ABA applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ABA application of 5 M either at BBCH-51 or BBCH-55 improved plant water relations, accumulation of compatible solutes and achene yield under drought stress whereas 10 M ABA application was less effective”
t0“sunflower”
Claim · model-written summary
The authors recommend 5 M ABA to mitigate water deficit stress at both growth stages.
- Taxon
- sunflowerHelianthus annuuse0
- Outcome
- 5 M ABA application could ameliorate the negative impact of water deficit stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it is recommended that 5 M ABA application could ameliorate the negative impact of water deficit stress at BBCH-51 and BBCH-55 in sunflower”
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