Abstract
S ummary Seasonal and diurnal changes in leaf water relations, stomatal behaviour and abscisic acid were studied in apricot ( Prunus armeniaca L.) trees growing in Adelaide, Australia. Diurnal changes in stomatal conductance and foliar abscisic acid (ABA) were small and the ABA content of expressed xylem sap was low (0·3 to 0·9 × 10 −4 mol m −3 ). This concentration of ABA was too low to influence stomatal conductance, although diurnal changes and some seasonal changes in leaf ABA could be accounted for by uptake from the xylem. Water potential fell throughout the growing season but high values of turgor were maintained by a corresponding fall in leaf osmotic potential. The fall in leaf osmotic potential was partly accounted for by a decrease in relative water content but measurements of osmotic potential at full turgor showed that there was a net accumulation of solute between December and March. Sorbitol was the solute chiefly responsible for this increase. The ability of apricot leaves to synthesize ABA in response to zero turgor was greatly reduced between November and March, although this ability was partly regained in April. ABA appears to be relatively unimportant in the control of stomatal conductance in apricot.
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Claims 12
Claim · model-written summary
Diurnal changes in conductance and foliar ABA were small.
- Taxon
- apricot
Prunus armeniacat0 - Outcome
- stomatal conductance and foliar abscisic acid (ABA)e0
- Direction
- smalle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Diurnal changes in stomatal conductance and foliar abscisic acid (ABA) were small”
t0“APRICOT LEAVES”
Claim · model-written summary
Xylem sap ABA content was low, at 0·3 to 0·9 × 10 −4 mol m −3.
- Taxon
- apricotPrunus armeniacat0
- Outcome
- ABA content of expressed xylem sape0
- Direction
- lowe0
- Value
- 0·3 to 0·9 × 10 −4 mol m −3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ABA content of expressed xylem sap was low (0·3 to 0·9 × 10 −4 mol m −3 )”
t0“APRICOT LEAVES”
Claim · model-written summary
That sap ABA concentration was too low to affect stomatal conductance.
- Taxon
- apricotPrunus armeniacat0
- Compound
- ABAe0
- Outcome
- stomatal conductancee0
- Qualifier
- too low to influencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This concentration of ABA was too low to influence stomatal conductance”
t0“APRICOT LEAVES”
Claim · model-written summary
Xylem uptake could account for diurnal and some seasonal changes in leaf ABA.
- Taxon
- apricotPrunus armeniacat0
- Outcome
- leaf ABAe0
- Qualifier
- uptake from the xyleme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“diurnal changes and some seasonal changes in leaf ABA could be accounted for by uptake from the xylem”
t0“APRICOT LEAVES”
Claim · model-written summary
Water potential fell over the growing season.
- Taxon
- apricotPrunus armeniacat0
- Outcome
- Water potentiale0
- Direction
- felle0
- Qualifier
- throughout the growing seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water potential fell throughout the growing season”
t0“APRICOT LEAVES”
Claim · model-written summary
Turgor stayed high as leaf osmotic potential fell.
- Taxon
- apricotPrunus armeniacat0
- Organ / stage
- leafe0
- Outcome
- turgore0
- Direction
- maintainede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high values of turgor were maintained by a corresponding fall in leaf osmotic potential”
t0“APRICOT LEAVES”
Claim · model-written summary
Declining relative water content partly explained the fall in leaf osmotic potential.
- Taxon
- apricotPrunus armeniacat0
- Outcome
- leaf osmotic potentiale0
- Qualifier
- decrease in relative water contente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fall in leaf osmotic potential was partly accounted for by a decrease in relative water content”
t0“APRICOT LEAVES”
Claim · model-written summary
Solute accumulated between December and March.
- Taxon
- apricotPrunus armeniacat0
- Outcome
- net accumulation of solutee0
- Qualifier
- between December and Marche0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was a net accumulation of solute between December and March”
t0“APRICOT LEAVES”
Claim · model-written summary
Sorbitol chiefly accounted for the solute increase.
- Taxon
- apricotPrunus armeniacat0
- Compound
- Sorbitole0
- Outcome
- this increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sorbitol was the solute chiefly responsible for this increase”
t0“APRICOT LEAVES”
Claim · model-written summary
Capacity to synthesize ABA under zero turgor declined from November to March.
- Taxon
- apricotPrunus armeniacae0
- Outcome
- ability of apricot leaves to synthesize ABAe0
- Direction
- reducede0
- Qualifier
- between November and Marche0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ability of apricot leaves to synthesize ABA in response to zero turgor was greatly reduced between November and March”
Claim · model-written summary
Capacity to synthesize ABA under zero turgor partly recovered in April.
- Taxon
- apricotPrunus armeniacat0
- Outcome
- this abilitye0
- Direction
- partly regainede0
- Qualifier
- in Aprile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this ability was partly regained in April”
t0“APRICOT LEAVES”
Claim · model-written summary
ABA appears relatively unimportant for controlling stomatal conductance.
- Taxon
- apricotPrunus armeniacae0
- Compound
- ABAe0
- Outcome
- stomatal conductancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ABA appears to be relatively unimportant in the control of stomatal conductance in apricot”