Abstract
Abstract This study investigated whether the exogenous application of glycine betaine (GB) could alleviate the adverse effects of water deficit on sunflower. Two sunflower lines, Gulshan‐98 and Suncross, were subjected to water deficit at the vegetative or the reproductive stages of plant growth. Three levels (0, 50 and 100 mmol l −1 ) of GB were applied as a pre‐sowing seed treatment or as a foliar spray at the time of initiation of water deficit at the vegetative or reproductive stages. Foliar application of GB at the time of initiation of water deficit treatments showed a marginal increase in shoot biomass in drought‐stressed plants. Exogenously supplied GB as a foliar spray also showed a positive role in reducing the effects of water deficit on net CO 2 assimilation rate, transpiration rate and sub‐stomatal CO 2 concentration in both sunflower lines. Pre‐sowing seed treatment with GB had no effects on the above‐mentioned physiological and growth attributes in both normally irrigated and drought‐stressed plants. Taken together, foliar application of GB increased net CO 2 assimilation rate which in turn showed a slight increase in growth of water‐stressed plants but this increase was not related to stomatal regulation.
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Claims 6
Claim · model-written summary
Foliar glycine betaine marginally increased shoot biomass under drought.
- Taxon
- sunflower
Helianthus annuust0 - Treatment
- Foliar application of GBe0
- Outcome
- shoot biomasse0
- Direction
- increasee0
- Qualifier
- drought‐stressed plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar application of GB at the time of initiation of water deficit treatments showed a marginal increase in shoot biomass in drought‐stressed plants.”
t0“sunflower”
Claim · model-written summary
Foliar glycine betaine reduced water-deficit effects on net CO2 assimilation, transpiration and substomatal CO2 in both lines.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- GB as a foliar spraye0
- Outcome
- net CO 2 assimilation rate, transpiration rate and sub‐stomatal CO 2 concentratione0
- Direction
- reducinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenously supplied GB as a foliar spray also showed a positive role in reducing the effects of water deficit on net CO 2 assimilation rate, transpiration rate and sub‐stomatal CO 2 concentration in both sunflower lines.”
t0“sunflower”
Claim · model-written summary
Presowing glycine betaine had no effect on the reported physiology and growth attributes under normal irrigation or drought.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- Pre‐sowing seed treatment with GBe0
- Outcome
- physiological and growth attributese0
- Direction
- no effectse0
- Qualifier
- normally irrigated and drought‐stressed plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pre‐sowing seed treatment with GB had no effects on the above‐mentioned physiological and growth attributes in both normally irrigated and drought‐stressed plants.”
t0“sunflower”
Claim · model-written summary
Foliar glycine betaine increased net CO2 assimilation in water-stressed plants.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- foliar application of GBe0
- Outcome
- net CO 2 assimilation ratee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliar application of GB increased net CO 2 assimilation rate”
t0“sunflower”
Claim · model-written summary
The assimilation increase was associated with a slight growth increase.
- Taxon
- sunflowerHelianthus annuust0
- Outcome
- growth of water‐stressed plantse0
- Direction
- increasee0
- Qualifier
- net CO 2 assimilation ratee0
Not reportedCompound
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased net CO 2 assimilation rate which in turn showed a slight increase in growth of water‐stressed plants”
t0“sunflower”
Claim · model-written summary
The growth increase was not related to stomatal regulation.
- Taxon
- sunflowerHelianthus annuust0
- Outcome
- this increasee0
- Qualifier
- stomatal regulatione0
Not reportedOrgan / stageDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this increase was not related to stomatal regulation”
t0“sunflower”
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