Abstract
SummaryLeaf abscission rates and nitrogen concentrations in persistent leaves were tracked on non-fruiting and fruiting almond [Prunus dulcis (Mill.) D.A.Webb] spurs located in either well-exposed or shaded canopy positions. Fruiting spurs, especially in shaded positions, had higher mid-season leaf abscission rates than did non-fruiting spurs, and the difference in abscission rates between shaded, fruiting spurs and other spur sub-populations increased with tree nitrogen deficiency. Nitrogen concentrations and contents of persistent leaves were lower on fruiting spurs than on non-fruiting spurs. Nitrogen contents of persistent leaves did not decline substantially over the period of kernel development (a period of high nitrogen demand by the fruit) regardless of spur shading and fruiting status, or tree nitrogen status. This indicates that little net nitrogen remobilisation from persistent leaves occurred during this period, even on fruiting spurs on nitrogen-deficient trees. Nitrogen deficiency accentuated nitrogen stress in shaded and fruiting spurs, as indicated by early leaf abscission. However, such differential stress was not reflected by the nitrogen concentration or content of persistent leaves during kernel development. Thus, sampling of persistent leaves from the shaded, fruiting spur sub-population for nitrogen analyses did not provide a practical, more sensitive diagnostic indicator of tree nitrogen status than did conventional leaf sampling from non-fruiting spurs.
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Claims 9
Claim · model-written summary
Fruiting almond spurs had higher mid-season leaf abscission than non-fruiting spurs, particularly in shade.
- Organ / stage
- Fruiting spurse0
- Outcome
- mid-season leaf abscission ratese0
- Direction
- highere0
- Comparator
- non-fruiting spurse0
Not reportedTaxon
Verbatim
e0“Fruiting spurs, especially in shaded positions, had higher mid-season leaf abscission rates than did non-fruiting spurs”
Claim · model-written summary
The abscission difference between shaded fruiting spurs and other spurs increased with tree nitrogen deficiency.
- Treatment
- tree nitrogen deficiencye0
- Outcome
- difference in abscission ratese0
- Direction
- increasede0
- Comparator
- other spur sub-populationse0
Not reportedTaxon
Verbatim
e0“the difference in abscission rates between shaded, fruiting spurs and other spur sub-populations increased with tree nitrogen deficiency”
Claim · model-written summary
Persistent leaves on fruiting spurs had lower nitrogen concentration than leaves on non-fruiting spurs.
- Organ / stage
- persistent leavese0
- Outcome
- Nitrogen concentrationse0
- Direction
- lowere0
- Comparator
- non-fruiting spurse0
Not reportedTaxon
Verbatim
e0“Nitrogen concentrations and contents of persistent leaves were lower on fruiting spurs than on non-fruiting spurs”
Claim · model-written summary
Persistent leaves on fruiting spurs had lower nitrogen content than leaves on non-fruiting spurs.
Not reportedTaxon
Verbatim
e0“Nitrogen concentrations and contents of persistent leaves were lower on fruiting spurs than on non-fruiting spurs”
Claim · model-written summary
Persistent leaf nitrogen content did not decline substantially during kernel development regardless of spur shade, fruiting, or tree nitrogen status.
- Organ / stage
- persistent leavese0
- Outcome
- Nitrogen contents of persistent leavese0
- Direction
- did not decline substantiallye0
- Qualifier
- regardless of spur shading and fruiting status, or tree nitrogen statuse0
Not reportedTaxon
Verbatim
e0“Nitrogen contents of persistent leaves did not decline substantially over the period of kernel development (a period of high nitrogen demand by the fruit) regardless of spur shading and fruiting status, or tree nitrogen status”
Claim · model-written summary
The authors infer little net nitrogen remobilisation from persistent leaves during kernel development.
Not reportedTaxon
Verbatim
e0“This indicates that little net nitrogen remobilisation from persistent leaves occurred during this period, even on fruiting spurs on nitrogen-deficient trees”
Claim · model-written summary
Nitrogen deficiency accentuated stress in shaded and fruiting spurs, indicated by early leaf abscission.
- Organ / stage
- shaded and fruiting spurse0
- Treatment
- Nitrogen deficiencye0
- Outcome
- early leaf abscissione0
Not reportedTaxonDirection
Verbatim
e0“Nitrogen deficiency accentuated nitrogen stress in shaded and fruiting spurs, as indicated by early leaf abscission”
Claim · model-written summary
Differential spur stress was not reflected by persistent leaf nitrogen concentration or content during kernel development.
Not reportedTaxon
Verbatim
e0“such differential stress was not reflected by the nitrogen concentration or content of persistent leaves during kernel development”
Claim · model-written summary
Sampling shaded fruiting spur leaves was no more sensitive for tree nitrogen diagnosis than conventional sampling.
- Outcome
- diagnostic indicator of tree nitrogen statuse0
- Direction
- did not providee0
- Comparator
- conventional leaf sampling from non-fruiting spurse0
Not reportedTaxon
Verbatim
e0“sampling of persistent leaves from the shaded, fruiting spur sub-population for nitrogen analyses did not provide a practical, more sensitive diagnostic indicator of tree nitrogen status than did conventional leaf sampling from non-fruiting spurs”