Abstract
We analyzed the effects of nitrate availability on growth of Navelina (Citrus sinensis (L.) Osbeck) scions grafted on three citrus rootstocks differing in salt tolerance: Carrizo citrange (Citrus sinensis (L.) Osbeck x Poncirus trifoliata (L.) Raf.), Citrus macrophylla Wester and Cleopatra mandarin (Citrus reshni Hort. ex Tanaka). Salt stress reduced total plant biomass by 27-38%, whereas potassium nitrate supplementation partially counteracted this effect by increasing dry matter and new leaf area. Salinized Carrizo citrange had the greatest response to nitrate supplementation, whereas the effects on salinized Cleopatra mandarin and C. macrophylla were less apparent. Nitrogen and chlorophyll contents and photosynthetic activity also increased in leaves of the nitrate-supplemented salinized plants. In salinized plants, nitrate supplementation reduced leaf abscission, stimulated photosynthetic activity and increased growth of new leaves. The nitrate treatment did not modify chloride concentration in leaves, but it reduced chloride concentrations in Carrizo and Macrophylla roots. Therefore, in both rootstocks, chloride content was similar in mature leaves, higher in immature leaves and lower in roots of the nitrate-supplemented salinized plants compared with salinized plants unsupplemented with nitrate. We suggest that the nitrate-induced stimulation of growth reduced chloride concentration in roots through the reallocation of chloride to new leaves.
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Claims 10
Claim · model-written summary
Salt stress reduced total plant biomass of citrus seedlings by 27-38%.
CitrusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“salt-stressed citrus seedlings”
e0“Salt stress reduced total plant biomass by 27-38%”
Claim · model-written summary
Potassium nitrate supplementation increased dry matter and new leaf area of salt-stressed citrus.
- Treatment
- potassium nitrate supplementatione1
- Outcome
- dry matter and new leaf areae1
- Direction
- increasinge1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“salt-stressed citrus seedlings”
e1“potassium nitrate supplementation partially counteracted this effect by increasing dry matter and new leaf area”
Claim · model-written summary
Carrizo citrange had the greatest response to nitrate supplementation among the salinized citrus rootstocks.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“salt-stressed citrus seedlings”
e2“Salinized Carrizo citrange had the greatest response to nitrate supplementation”
Claim · model-written summary
Nitrate supplementation increased nitrogen and chlorophyll contents and photosynthetic activity in leaves of salinized citrus.
- Treatment
- nitrate-supplementede3
- Outcome
- Nitrogen and chlorophyll contents and photosynthetic activitye3
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“salt-stressed citrus seedlings”
e3“Nitrogen and chlorophyll contents and photosynthetic activity also increased in leaves of the nitrate-supplemented salinized plants”
Claim · model-written summary
Nitrate supplementation reduced leaf abscission in salinized citrus.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“salt-stressed citrus seedlings”
e4“nitrate supplementation reduced leaf abscission, stimulated photosynthetic activity and increased growth of new leaves”
Claim · model-written summary
Nitrate supplementation increased the growth of new leaves in salinized citrus.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“salt-stressed citrus seedlings”
e4“nitrate supplementation reduced leaf abscission, stimulated photosynthetic activity and increased growth of new leaves”
Claim · model-written summary
The nitrate treatment did not modify chloride concentration in leaves of salinized citrus.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“salt-stressed citrus seedlings”
e5“The nitrate treatment did not modify chloride concentration in leaves, but it reduced chloride concentrations in Carrizo and Macrophylla roots”
Claim · model-written summary
The nitrate treatment reduced chloride concentrations in the roots of Carrizo citrange and Citrus macrophylla.
- Material
- Carrizo and Macrophyllae5
- Treatment
- nitrate treatmente5
- Outcome
- chloride concentrationse5
- Direction
- reducede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“salt-stressed citrus seedlings”
e5“The nitrate treatment did not modify chloride concentration in leaves, but it reduced chloride concentrations in Carrizo and Macrophylla roots”
Claim · model-written summary
Chloride content was higher in immature leaves of nitrate-supplemented salinized citrus.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“salt-stressed citrus seedlings”
e6“chloride content was similar in mature leaves, higher in immature leaves and lower in roots of the nitrate-supplemented salinized plants”
Claim · model-written summary
Nitrate-induced growth stimulation likely reduced root chloride by reallocating chloride to new leaves.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“salt-stressed citrus seedlings”
e7“reduced chloride concentration in roots through the reallocation of chloride to new leaves”
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