Abstract
This work was undertaken in an effort to reconcile the conflicting proline-accumulating responses of the barley (Hordeum vulgare L.) cultivars, Excelsior and Proctor, reported by Singh et al. (1972) and Hanson et al. (1976). It deals with the effects of different vapor pressure deficits (VPD) during growth and subsequent drought stress on several barley cultivars. A higher VPD (1.2 kilopascals) during Clipper seedling growth resulted in higher solute-accumulating ability, seemingly independently of leaf water potential, than a lower VPD (0.12 kilopascals). The higher VPD during stress also resulted in higher solute contents, and this response may be more closely related to leaf water potential. When the responses of Excelsior and Proctor were examined in detail, it was found that the relative proline-accumulating ability of the two cultivars was dependent upon the VPD under which they were grown. At low VPD, Proctor accumulated significantly more proline than did Excelsior; whereas at higher VPD, Excelsior accumulated more proline than did Proctor. The crossover occurred at a VPD of about 0.72 kilopascals. This reversal of cultivar response was enhanced by multiplying seed under the two VPD extremes. Glycinebetaine accumulation did not demonstrate the crossover effect, although the concentration of this compound in all cultivars also depended on the VPD prevailing during growth and/or stress. Solute levels, in general, were more closely related to the decrease in relative water content than to a decrease in leaf water potential. It is concluded that the conflicting proline-accumulating responses of Excelsior and Proctor could be explained by these findings.
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Claims 9
Claim · model-written summary
Higher growth VPD increased Clipper seedling solute accumulation relative to lower VPD.
- Taxon
- Hordeum vulgare L.
.jpg?width=60)
Hordeum vulgaret0 - Material
- Clippere0
- Treatment
- higher VPD (1.2 kilopascals)e0
- Outcome
- solute-accumulating abilitye0
- Direction
- highere0
- Comparator
- lower VPD (0.12 kilopascals)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“A higher VPD (1.2 kilopascals) during Clipper seedling growth resulted in higher solute-accumulating ability, seemingly independently of leaf water potential, than a lower VPD (0.12 kilopascals).”
t0“barley (Hordeum vulgare L.)”
Claim · model-written summary
Higher VPD during stress increased solute content.
- Taxon
- Hordeum vulgare L.Hordeum vulgaret0
- Treatment
- higher VPD during stresse0
- Outcome
- solute contentse0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The higher VPD during stress also resulted in higher solute contents, and this response may be more closely related to leaf water potential.”
t0“barley (Hordeum vulgare L.)”
Claim · model-written summary
At low VPD, Proctor accumulated significantly more proline than Excelsior.
- Taxon
- Hordeum vulgare L.Hordeum vulgaret0
- Material
- Proctore0
- Outcome
- prolinee0
- Direction
- moree0
- Qualifier
- low VPDe0
- Comparator
- Excelsiore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At low VPD, Proctor accumulated significantly more proline than did Excelsior”
t0“barley (Hordeum vulgare L.)”
Claim · model-written summary
At higher VPD, Excelsior accumulated more proline than Proctor.
- Taxon
- Hordeum vulgare L.Hordeum vulgaret0
- Material
- Excelsiore0
- Outcome
- prolinee0
- Direction
- moree0
- Qualifier
- higher VPDe0
- Comparator
- Proctore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at higher VPD, Excelsior accumulated more proline than did Proctor.”
t0“barley (Hordeum vulgare L.)”
Claim · model-written summary
The cultivar proline response crossed over at about 0.72 kilopascals VPD.
- Taxon
- Hordeum vulgare L.Hordeum vulgaret0
- Outcome
- crossovere0
- Value
- about 0.72 kilopascalse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The crossover occurred at a VPD of about 0.72 kilopascals.”
e1“relative proline-accumulating ability of the two cultivars”
t0“barley (Hordeum vulgare L.)”
Claim · model-written summary
Multiplying seed at the two VPD extremes enhanced the cultivar response reversal.
- Taxon
- Hordeum vulgare L.Hordeum vulgaret0
- Treatment
- multiplying seed under the two VPD extremese0
- Outcome
- reversal of cultivar responsee0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This reversal of cultivar response was enhanced by multiplying seed under the two VPD extremes.”
t0“barley (Hordeum vulgare L.)”
Claim · model-written summary
Glycinebetaine accumulation showed no cultivar crossover.
- Taxon
- Hordeum vulgare L.Hordeum vulgaret0
- Outcome
- Glycinebetaine accumulatione0
- Direction
- did not demonstratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glycinebetaine accumulation did not demonstrate the crossover effect”
t0“barley (Hordeum vulgare L.)”
Claim · model-written summary
Glycinebetaine concentration depended on growth or stress VPD in all cultivars.
- Taxon
- Hordeum vulgare L.Hordeum vulgaret0
- Treatment
- VPD prevailing during growth and/or stresse0
- Outcome
- concentration of this compounde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentration of this compound in all cultivars also depended on the VPD prevailing during growth and/or stress.”
e1“Glycinebetaine accumulation”
t0“barley (Hordeum vulgare L.)”
Claim · model-written summary
Solute levels related more closely to declining relative water content than declining leaf water potential.
- Taxon
- Hordeum vulgare L.Hordeum vulgaret0
- Outcome
- Solute levelse0
- Direction
- more closely relatede0
- Comparator
- leaf water potentiale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Solute levels, in general, were more closely related to the decrease in relative water content than to a decrease in leaf water potential.”
t0“barley (Hordeum vulgare L.)”