Abstract
A pot experiment was carried out to determine the changes in gas exchange, growth and chlorophyll contents of 'Washington Navel', 'Red Blood' and 'Shamouti' oranges (Citrus sinensis [L.] Osbeck) treated with 0.1 and 1 mM abscisic acid (ABA) under water deficit conditions in a partially controlled greenhouse for 150 days. The drought treatments were imposed by the depletion of 25, 50 and 75% of the available water (DAW). The results have shown the decline in growth of oranges grown under severe water deficit stress, with the reduction in leaf CO2 assimilation rate (Pn), transpiration (T) and chlorophyll content. The growth and gas exchange were most impacted by imposing the irrigation at 75%DAW. Considerable genotypic variation in drought tolerance was observed. Based on gas exchange response, 'Washington Navel' was considered a drought sensitive cultivar, while 'Shamouti' was considered drought tolerant under the conditions of this study. 'Red Blood' was also affected but to a lesser extent. Exogenous application of ABA had no effect on growth, chlorophyll content and gas exchange parameters under well-watered conditions (25%DAW). Application of ABA at 1mM supported a considerably lower leaf Pn, T and chlorophyll, in addition to taller plants for 'Washington Navel', especially under severe drought stress.
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Claims 11
Claim · model-written summary
Severe water deficit reduced orange growth and leaf assimilation, transpiration and chlorophyll.
Not reportedComparator
Verbatim
e0“The results have shown the decline in growth of oranges grown under severe water deficit stress, with the reduction in leaf CO2 assimilation rate (Pn), transpiration (T) and chlorophyll content.”
Claim · model-written summary
Severe water deficit reduced orange leaf CO2 assimilation.
- Taxon
- orangese0
- Treatment
- severe water deficit stresse0
- Outcome
- leaf CO2 assimilation ratee0
- Direction
- reductione0
Not reportedComparator
Verbatim
e0“The results have shown the decline in growth of oranges grown under severe water deficit stress, with the reduction in leaf CO2 assimilation rate (Pn), transpiration (T) and chlorophyll content.”
Claim · model-written summary
Severe water deficit reduced orange transpiration and chlorophyll content.
- Taxon
- Oranget0
- Treatment
- severe water deficit stresse0
- Outcome
- transpiration (T) and chlorophyll contente0
- Direction
- reductione0
Not reportedComparator
Verbatim
e0“under severe water deficit stress, with the reduction in leaf CO2 assimilation rate (Pn), transpiration (T) and chlorophyll content”
t0“Orange”
Claim · model-written summary
Growth and gas exchange were most affected at 75% depletion of available water.
- Taxon
- Oranget0
- Treatment
- irrigation at 75%DAWe0
- Outcome
- growth and gas exchangee0
- Direction
- most impactede0
Not reportedComparator
Verbatim
e0“The growth and gas exchange were most impacted by imposing the irrigation at 75%DAW.”
t0“Orange”
Claim · model-written summary
Orange genotypes varied in drought tolerance.
Verbatim
e0“Considerable genotypic variation in drought tolerance was observed.”
t0“Orange”
Claim · model-written summary
Washington Navel was considered drought sensitive based on gas exchange.
Verbatim
e0“Based on gas exchange response, 'Washington Navel' was considered a drought sensitive cultivar”
t0“Orange”
Claim · model-written summary
Shamouti was considered drought tolerant based on gas exchange.
Verbatim
e0“'Shamouti' was considered drought tolerant under the conditions of this study”
t0“Orange”
Claim · model-written summary
Red Blood was affected by drought to a lesser extent.
Verbatim
e0“'Red Blood' was also affected but to a lesser extent”
t0“Orange”
Claim · model-written summary
ABA did not affect growth, chlorophyll content or gas exchange under well-watered conditions.
- Taxon
- Oranget0
- Treatment
- Exogenous application of ABAe0
- Outcome
- growth, chlorophyll content and gas exchange parameterse0
- Direction
- no effecte0
- Qualifier
- well-watered conditions (25%DAW)e0
Not reportedComparator
Verbatim
e0“Exogenous application of ABA had no effect on growth, chlorophyll content and gas exchange parameters under well-watered conditions (25%DAW).”
t0“Orange”
Claim · model-written summary
At 1mM ABA, Washington Navel had lower leaf assimilation, transpiration and chlorophyll, especially under severe drought.
- Taxon
- Oranget0
- Material
- 'Washington Navel'e0
- Treatment
- ABA at 1mMe0
- Outcome
- leaf Pn, T and chlorophylle0
- Direction
- lowere0
- Qualifier
- especially under severe drought stresse0
Not reportedComparator
Verbatim
e0“Application of ABA at 1mM supported a considerably lower leaf Pn, T and chlorophyll, in addition to taller plants for 'Washington Navel', especially under severe drought stress.”
t0“Orange”
Claim · model-written summary
At 1mM ABA, Washington Navel plants were taller, especially under severe drought.
- Taxon
- Oranget0
- Material
- 'Washington Navel'e0
- Treatment
- ABA at 1mMe0
- Outcome
- plantse0
- Direction
- tallere0
- Qualifier
- especially under severe drought stresse0
Not reportedComparator
Verbatim
e0“Application of ABA at 1mM supported a considerably lower leaf Pn, T and chlorophyll, in addition to taller plants for 'Washington Navel', especially under severe drought stress.”
t0“Orange”
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See all 5 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.