Abstract
Studies on the distribution and remobilization of nitrate in vegetable plants are important theoretical bases for decreasing nitrate content in vegetables and increasing nitrate use efficiency by plants.Hydroponic experiments and plant electro-physiological methods were used to determine tissue nitrate content and vacuolar nitrate activity of different organs of two pakchoi cultivars,which were significantly different in nitrate accumulation.Results obtained were as follows:Vacuolar nitrate activities of leaf blades,petioles and roots were 4.6,2.0 and 7.4 times of tissue nitrate content respectively,inferring that nitrate activity in vacuoles was much higher than in cytosol.Nitrate contents in leaf blades,petioles and roots of Liangbaiye 1 were 2.4,1.9 and 3.6 times of those of Shanghaiqing.Tissue nitrate contents in different organs of pakchoi were in the decreasing order of petiole leaf blade root,but no significant difference was found among these three organs.After pakchoi plants were transferred to the solution without nitrate,both the tissue nitrate contents and vacuolar nitrate activity significantly decreased,while cytosolic nitrate activity and NRA in leaf blades maintained relatively unchanged.Nitrate was predominantly stored in vacuole and could be reused by plants.Tissue nitrate stored in roots and petioles could be remobilized by leaf blades,and vacuolar nitrate could be released into cytosol to maintain a steady cytosolic nitrate concentration,and thus the nitrate reductase activity was kept in normal level.Liangbaiye 1,a high nitrate accumulating cultivar,had a high vacuolar nitrate activity,and its tissue nitrate contents decreased more slowly than Shanghaiqing after transferring to the solution without nitrogen,which probably was caused by its low NRA.
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Claims 16
Claim · model-written summary
Vacuolar nitrate activity in leaf blades was 4.6 times the tissue nitrate content.
- Taxon
- pakchoie2
- Organ / stage
- leaf bladese1
- Outcome
- Vacuolar nitrate activitiese1
- Value
- 4.6e1
- Qualifier
- times of tissue nitrate contente1
Not reportedDirection
Verbatim
e1“Vacuolar nitrate activities of leaf blades,petioles and roots were 4.6,2.0 and 7.4 times of tissue nitrate content respectively,inferring that nitrate activity in vacuoles was much higher than in cytosol”
e2“Two Cultivars of Pakchoi Plant”
Claim · model-written summary
Vacuolar nitrate activity in petioles was 2.0 times the tissue nitrate content.
- Taxon
- pakchoie2
- Organ / stage
- petiolese1
- Outcome
- Vacuolar nitrate activitiese1
- Value
- 2.0e1
- Qualifier
- times of tissue nitrate contente1
Not reportedDirection
Verbatim
e1“Vacuolar nitrate activities of leaf blades,petioles and roots were 4.6,2.0 and 7.4 times of tissue nitrate content respectively,inferring that nitrate activity in vacuoles was much higher than in cytosol”
e2“Two Cultivars of Pakchoi Plant”
Claim · model-written summary
Vacuolar nitrate activity in roots was 7.4 times the tissue nitrate content.
- Taxon
- pakchoie2
- Organ / stage
- rootse1
- Outcome
- Vacuolar nitrate activitiese1
- Value
- 7.4e1
- Qualifier
- times of tissue nitrate contente1
Not reportedDirection
Verbatim
e1“Vacuolar nitrate activities of leaf blades,petioles and roots were 4.6,2.0 and 7.4 times of tissue nitrate content respectively,inferring that nitrate activity in vacuoles was much higher than in cytosol”
e2“Two Cultivars of Pakchoi Plant”
Claim · model-written summary
Nitrate activity in vacuoles was much higher than in cytosol.
Verbatim
e1“Vacuolar nitrate activities of leaf blades,petioles and roots were 4.6,2.0 and 7.4 times of tissue nitrate content respectively,inferring that nitrate activity in vacuoles was much higher than in cytosol”
e2“Two Cultivars of Pakchoi Plant”
Claim · model-written summary
Nitrate content in leaf blades of Liangbaiye 1 was 2.4 times that of Shanghaiqing.
- Taxon
- pakchoie2
- Material
- Liangbaiye 1e1
- Organ / stage
- leaf bladese1
- Outcome
- Nitrate contentse1
- Value
- 2.4e1
- Comparator
- Shanghaiqinge1
Not reportedDirection
Verbatim
e1“Nitrate contents in leaf blades,petioles and roots of Liangbaiye 1 were 2.4,1.9 and 3.6 times of those of Shanghaiqing”
e2“Two Cultivars of Pakchoi Plant”
Claim · model-written summary
Nitrate content in petioles of Liangbaiye 1 was 1.9 times that of Shanghaiqing.
- Taxon
- pakchoie2
- Material
- Liangbaiye 1e1
- Organ / stage
- petiolese1
- Outcome
- Nitrate contentse1
- Value
- 1.9e1
- Comparator
- Shanghaiqinge1
Not reportedDirection
Verbatim
e1“Nitrate contents in leaf blades,petioles and roots of Liangbaiye 1 were 2.4,1.9 and 3.6 times of those of Shanghaiqing”
e2“Two Cultivars of Pakchoi Plant”
Claim · model-written summary
Nitrate content in roots of Liangbaiye 1 was 3.6 times that of Shanghaiqing.
- Taxon
- pakchoie2
- Material
- Liangbaiye 1e1
- Organ / stage
- rootse1
- Outcome
- Nitrate contentse1
- Value
- 3.6e1
- Comparator
- Shanghaiqinge1
Not reportedDirection
Verbatim
e1“Nitrate contents in leaf blades,petioles and roots of Liangbaiye 1 were 2.4,1.9 and 3.6 times of those of Shanghaiqing”
e2“Two Cultivars of Pakchoi Plant”
Claim · model-written summary
Tissue nitrate content decreased in the order petiole, leaf blade, root, with no significant difference among the three organs.
Verbatim
e1“Tissue nitrate contents in different organs of pakchoi were in the decreasing order of petiole leaf blade root,but no significant difference was found among these three organs”
Claim · model-written summary
Transfer to nitrate-free solution significantly decreased tissue nitrate content and vacuolar nitrate activity in pakchoi.
- Taxon
- pakchoie1
- Treatment
- solution without nitratee1
- Outcome
- tissue nitrate contents and vacuolar nitrate activitye1
- Direction
- significantly decreasede1
Not reportedComparator
Verbatim
e1“After pakchoi plants were transferred to the solution without nitrate,both the tissue nitrate contents and vacuolar nitrate activity significantly decreased”
e2“Two Cultivars of Pakchoi Plant”
Claim · model-written summary
Cytosolic nitrate activity and NRA in leaf blades were maintained relatively unchanged after transfer to nitrate-free solution.
- Taxon
- pakchoie3
- Treatment
- solution without nitratee2
- Outcome
- cytosolic nitrate activity and NRA in leaf bladese1
- Direction
- maintained relatively unchangede1
Not reportedComparator
Verbatim
e1“while cytosolic nitrate activity and NRA in leaf blades maintained relatively unchanged”
e2“After pakchoi plants were transferred to the solution without nitrate,both the tissue nitrate contents and vacuolar nitrate activity significantly decreased”
e3“Two Cultivars of Pakchoi Plant”
Claim · model-written summary
Nitrate was predominantly stored in the vacuole of pakchoi.
Verbatim
e1“Nitrate was predominantly stored in vacuole and could be reused by plants”
e2“Two Cultivars of Pakchoi Plant”
Claim · model-written summary
Tissue nitrate stored in roots and petioles is remobilized by leaf blades in pakchoi.
Verbatim
e1“Tissue nitrate stored in roots and petioles could be remobilized by leaf blades”
e2“Two Cultivars of Pakchoi Plant”
Claim · model-written summary
Vacuolar nitrate release into cytosol is proposed to keep nitrate reductase activity at a normal level in pakchoi.
Verbatim
e1“vacuolar nitrate could be released into cytosol to maintain a steady cytosolic nitrate concentration,and thus the nitrate reductase activity was kept in normal level”
e2“Two Cultivars of Pakchoi Plant”
Claim · model-written summary
Liangbaiye 1, a high nitrate accumulating cultivar, had a high vacuolar nitrate activity.
Verbatim
e1“Liangbaiye 1,a high nitrate accumulating cultivar,had a high vacuolar nitrate activity”
e2“Two Cultivars of Pakchoi Plant”
Claim · model-written summary
Tissue nitrate content of Liangbaiye 1 decreased more slowly than that of Shanghaiqing after transfer to nitrogen-free solution.
Verbatim
e1“its tissue nitrate contents decreased more slowly than Shanghaiqing after transferring to the solution without nitrogen,which probably was caused by its low NRA”
e2“Liangbaiye 1,a high nitrate accumulating cultivar,had a high vacuolar nitrate activity”
e3“Two Cultivars of Pakchoi Plant”
Claim · model-written summary
The slower decrease of tissue nitrate in Liangbaiye 1 is probably caused by its low NRA.
Verbatim
e1“its tissue nitrate contents decreased more slowly than Shanghaiqing after transferring to the solution without nitrogen,which probably was caused by its low NRA”
e2“Two Cultivars of Pakchoi Plant”
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