Abstract
Effect of irrigation deprivation during the harvest period on the nonstructural carbohydrate (NC) content of dormant, mature, field-grown almond (Prunus dulcis (Mill.) D.A. Webb cv. Nonpareil) trees was studied. Roots, trunk, branches, spurs and stems of 12 trees were subsampled in February 1997, across a gradient of irrigation treatments (FI = fully irrigated, MS = moderately stressed and SS = severely stressed) to relate NC concentration to the degree of water stress experienced by individual trees during the previous (1996) harvest period. To assess the effect of water stress on whole-tree NC content, three dormant FI trees and three dormant SS trees were excavated on December 10, 1997, and dry weights and NC and N concentrations of the tree components were determined. Whole-tree biomass did not differ significantly between FI and SS trees, although SS trees tended to have less total dry weight. Although roots constituted just 13% of tree biomass, they stored 36 and 44% of tree NC and N contents, respectively. There were negative relationships between the seasonal minimum values of both midday (Psi(ms)) and predawn (Psi(pd)) stem water potentials during the harvest period and root NC content of dormant trees. Severe water stress during the harvest period resulted in a 26% reduction in NC content and a 50% reduction in biomass of current-year stems (> 5 cm in length) per tree. The reduction in NC content is consistent with the previously reported late season reductions in leaf function and persistence. The SS trees exhibited a reduction in NC content but not in N content per tree, indicating that late season accumulation of NC and N were uncoupled in trees subjected to severe harvest-period water stress.
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Claims 11
Claim · model-written summary
Whole-tree biomass did not differ significantly between fully irrigated and severely stressed almond trees.
- Taxon
- almond
Prunus dulcist0 - Treatment
- SSe0
- Outcome
- Whole-tree biomasse0
- Direction
- did not differe0
- Comparator
- FIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Whole-tree biomass did not differ significantly between FI and SS trees”
e1“FI = fully irrigated, MS = moderately stressed and SS = severely stressed”
t0“almond trees”
Claim · model-written summary
Severely stressed almond trees tended to have less total dry weight.
- Taxon
- almondPrunus dulcist0
- Treatment
- SSe0
- Outcome
- total dry weighte0
- Direction
- lesse0
- Qualifier
- tendede0
- Comparator
- FIe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SS trees tended to have less total dry weight”
t0“almond trees”
e1“FI = fully irrigated, MS = moderately stressed and SS = severely stressed”
Claim · model-written summary
Almond roots made up 13% of tree biomass.
- Taxon
- almondPrunus dulcist0
- Organ / stage
- rootse0
- Outcome
- tree biomasse0
- Value
- 13%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“roots constituted just 13% of tree biomass”
t0“almond trees”
Claim · model-written summary
Almond roots stored 36% of tree nonstructural carbohydrate content.
- Taxon
- almondPrunus dulcist0
- Organ / stage
- rootse1
- Outcome
- tree NCe0
- Value
- 36e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“they stored 36 and 44% of tree NC and N contents, respectively”
e1“roots constituted just 13% of tree biomass”
t0“almond trees”
Claim · model-written summary
Almond roots stored 44% of tree nitrogen content.
- Taxon
- almondPrunus dulcist0
- Organ / stage
- rootse1
- Outcome
- N contentse0
- Value
- 44%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“they stored 36 and 44% of tree NC and N contents, respectively”
e1“roots constituted just 13% of tree biomass”
t0“almond trees”
Claim · model-written summary
Seasonal minimum midday stem water potential was negatively related to root nonstructural carbohydrate content.
- Taxon
- almondPrunus dulcist0
- Organ / stage
- roote0
- Outcome
- root NC contente0
- Direction
- negativee0
- Qualifier
- midday (Psi(ms))e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“negative relationships between the seasonal minimum values of both midday (Psi(ms)) and predawn (Psi(pd)) stem water potentials during the harvest period and root NC content of dormant trees”
t0“almond trees”
Claim · model-written summary
Seasonal minimum predawn stem water potential was negatively related to root nonstructural carbohydrate content.
- Taxon
- almondPrunus dulcist0
- Organ / stage
- roote0
- Outcome
- root NC contente0
- Direction
- negativee0
- Qualifier
- predawn (Psi(pd))e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“negative relationships between the seasonal minimum values of both midday (Psi(ms)) and predawn (Psi(pd)) stem water potentials during the harvest period and root NC content of dormant trees”
t0“almond trees”
Claim · model-written summary
Severe harvest-period water stress reduced current-year stem nonstructural carbohydrate content by 26%.
- Taxon
- almondPrunus dulcist0
- Organ / stage
- current-year stemse0
- Treatment
- Severe water stresse0
- Outcome
- NC contente0
- Direction
- reductione0
- Value
- 26%e0
- Comparator
- fully irrigatede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Severe water stress during the harvest period resulted in a 26% reduction in NC content and a 50% reduction in biomass of current-year stems (> 5 cm in length) per tree”
e1“FI = fully irrigated, MS = moderately stressed and SS = severely stressed”
t0“almond trees”
Claim · model-written summary
Severe harvest-period water stress reduced current-year stem biomass by 50%.
- Taxon
- almondPrunus dulcist0
- Organ / stage
- current-year stemse0
- Treatment
- Severe water stresse0
- Outcome
- biomass of current-year stemse0
- Direction
- reductione0
- Value
- 50%e0
- Comparator
- fully irrigatede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Severe water stress during the harvest period resulted in a 26% reduction in NC content and a 50% reduction in biomass of current-year stems (> 5 cm in length) per tree”
e1“FI = fully irrigated, MS = moderately stressed and SS = severely stressed”
t0“almond trees”
Claim · model-written summary
Severely stressed almond trees had reduced nonstructural carbohydrate content per tree.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The SS trees exhibited a reduction in NC content but not in N content per tree”
e1“FI = fully irrigated, MS = moderately stressed and SS = severely stressed”
t0“almond trees”
Claim · model-written summary
Severely stressed almond trees did not show reduced nitrogen content per tree.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The SS trees exhibited a reduction in NC content but not in N content per tree”
e1“FI = fully irrigated, MS = moderately stressed and SS = severely stressed”
t0“almond trees”
The same questions in other papers
drought · growth · Prunus dulcis (almond)Results agree
5 papers in the same direction as this paper
- negative
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See all 6 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.