Abstract
Intact plants of okra (Hibiscus esculentus) were chilled at 6°C in the light, and leaf diffusion resistance (LDR) and leaf water potential measured. The response of the LDR of excised leaves to fresh weight loss and, separately, exogenous abscisic acid (ABA) supply, was also studied at 6°C and 30°C. The influence of two pre-treatments upon these measurements was studied. The two pre-treatments consisted of the imposition of a period of water stress at 30°C prior to measurement (followed by re-watering) or the spraying of the leaves with ABA. It was found that plants that had been grown in a high humidity environment continuously (designated control plants) had stomata that were very unresponsive to both water loss from the leaves and to exogenous ABA at both temperatures (6°C and 30°C). Chilling the control plants resulted in rapid wilting and concomitant decline in leaf water potential. A pre-treatment of water stress prior to chilling did not alter or reduce the rate of development of chilling injury, nor did the pre-treatment increase the responsiveness of stomata at 6°C to water loss or exogenous ABA. However, spraying the leaves with ABA prior to chilling reduced the severity and delayed the onset of chilling injury. Stomatal response to water stress and exogenous ABA was increased by the spraying pre-treatment. These results are discussed in relation to previous studies of the phenomenon of stomatal locking open at low temperature and the effect of pre-treatments upon the development of chill-resistance.
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Claims 8
Claim · model-written summary
Stomata of control plants grown in high humidity were very unresponsive to water loss and to exogenous ABA at both temperatures.
- Taxon
- Hibiscus esculentus
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Abelmoschus esculentust0 - Treatment
- high humidity environmente1
- Outcome
- stomatae1
- Qualifier
- very unresponsive to both water loss from the leaves and to exogenous ABAe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e1“plants that had been grown in a high humidity environment continuously (designated control plants) had stomata that were very unresponsive to both water loss from the leaves and to exogenous ABA at both temperatures”
t0“Hibiscus esculentus”
Claim · model-written summary
Chilling decreased leaf water potential in okra.
- Taxon
- Hibiscus esculentusAbelmoschus esculentust0
- Treatment
- Chillinge2
- Outcome
- leaf water potentiale2
- Direction
- declinee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Chilling the control plants resulted in rapid wilting and concomitant decline in leaf water potential”
t0“Hibiscus esculentus”
Claim · model-written summary
Chilling caused rapid wilting of okra leaves.
- Taxon
- Hibiscus esculentusAbelmoschus esculentust0
- Treatment
- Chillinge2
- Outcome
- wiltinge2
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Chilling the control plants resulted in rapid wilting and concomitant decline in leaf water potential”
t0“Hibiscus esculentus”
Claim · model-written summary
Water stress as a pre-treatment did not alter or reduce the rate of development of chilling injury.
- Taxon
- Hibiscus esculentusAbelmoschus esculentust0
- Treatment
- pre-treatment of water stresse3
- Outcome
- rate of development of chilling injurye3
- Direction
- did not alter or reducee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“A pre-treatment of water stress prior to chilling did not alter or reduce the rate of development of chilling injury”
t0“Hibiscus esculentus”
Claim · model-written summary
Water stress pre-treatment did not increase stomatal responsiveness to water loss or exogenous ABA at 6°C.
- Taxon
- Hibiscus esculentusAbelmoschus esculentust0
- Treatment
- pre-treatmente4
- Outcome
- responsiveness of stomatae4
- Direction
- increasee4
- Qualifier
- at 6°Ce4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“nor did the pre-treatment increase the responsiveness of stomata at 6°C to water loss or exogenous ABA”
t0“Hibiscus esculentus”
Claim · model-written summary
Spraying leaves with ABA before chilling reduced the severity of chilling injury.
- Taxon
- Hibiscus esculentusAbelmoschus esculentust0
- Treatment
- spraying the leaves with ABAe5
- Outcome
- severitye5
- Direction
- reducede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“spraying the leaves with ABA prior to chilling reduced the severity and delayed the onset of chilling injury”
t0“Hibiscus esculentus”
Claim · model-written summary
Spraying leaves with ABA before chilling delayed the onset of chilling injury.
- Taxon
- Hibiscus esculentusAbelmoschus esculentust0
- Treatment
- spraying the leaves with ABAe5
- Outcome
- onset of chilling injurye5
- Direction
- delayede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“spraying the leaves with ABA prior to chilling reduced the severity and delayed the onset of chilling injury”
t0“Hibiscus esculentus”
Claim · model-written summary
Spraying with ABA increased the stomatal response to water stress and exogenous ABA.
- Taxon
- Hibiscus esculentusAbelmoschus esculentust0
- Treatment
- spraying pre-treatmente6
- Outcome
- Stomatal response to water stress and exogenous ABAe6
- Direction
- increasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Stomatal response to water stress and exogenous ABA was increased by the spraying pre-treatment”
t0“Hibiscus esculentus”
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