Abstract
The effects of three nitrate levels - 14(CK), 56(T-1), and 140 mmol L-1 (T-2) - on growth and photosynthetic capacity of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated. The results showed that at 12 d after treatment plant height, stem diameter, leaf area, and leaf number of cucumber seedlings were stimulated by 56 mmol L-1 nitrate, whereas were inhibited significantly by 140 mmol L-1 nitrate compared with CK. Short-term stimulation in photosynthetic rate occurred under T-1 treatment, and then recovered to the level of CK. Photosynthetic rate of T-2 seedlings significantly decreased over treatment course with respect to CK. Photosynthetic pigment content of T-1 and T-2 increased during the first 2 d, and gradually recovered to the level of CK thereafter. Chlorophyll a/b and carotenoids/chlorophyll of T-1 had no significant difference from CK during treatment period. During the first 4 d, there was no significant difference in chlorophyll a/b and carotenoids/chlorophyll between T-2 and CK. After 4 d, chlorophyll a/b of T-2 increased gradually, whereas carotenoids/chlorophyll decreased. Actual PSII efficiency (ΦPSII) and photochemical quenching (qP) of T-1 had no significant difference from CK, and non-photochemical quenching (qN) was a little higher than CK after 2 d. During the first 2 d, there was little difference in ΦPSII and qP between T-2 and CK. After 2 d, both ΦPSII and qP of T-2 decreased to a great extend. A significant increase in qN of T-2 occurred over treatment course. With respect to CK, Hill reaction activity of T-1 slightly decreased, and T-2 treatment resulted in a significant decrease of Hill reaction activity. This evidence indicates that high-level nitrate stress may reduce photosynthesis through its effects not only on stomatal conductance but on the photosynthetic apparatus.
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Claims 20
Claim · model-written summary
At 12 days, 56 mmol L-1 nitrate stimulated plant height, stem diameter and leaf area of cucumber seedlings relative to CK.
- Taxon
- cucumber
Cucumis sativuse0 - Material
- Xintaimicie0
- Organ / stage
- seedlingse0
- Treatment
- 56 mmol L-1 nitratee1
- Outcome
- plant height, stem diameter, leaf areae1
- Direction
- stimulatede1
- Qualifier
- 12 d after treatmente1
- Comparator
- CKe1
- Setting
- hydroponic culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of three nitrate levels - 14(CK), 56(T-1), and 140 mmol L-1 (T-2) - on growth and photosynthetic capacity of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated”
e1“at 12 d after treatment plant height, stem diameter, leaf area, and leaf number of cucumber seedlings were stimulated by 56 mmol L-1 nitrate, whereas were inhibited significantly by 140 mmol L-1 nitrate compared with CK”
Claim · model-written summary
At 12 days, 56 mmol L-1 nitrate stimulated leaf number of cucumber seedlings relative to CK.
- Taxon
- cucumberCucumis sativuse0
- Material
- Xintaimicie0
- Organ / stage
- seedlingse0
- Treatment
- 56 mmol L-1 nitratee1
- Outcome
- leaf numbere1
- Direction
- stimulatede1
- Qualifier
- 12 d after treatmente1
- Comparator
- CKe1
- Setting
- hydroponic culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of three nitrate levels - 14(CK), 56(T-1), and 140 mmol L-1 (T-2) - on growth and photosynthetic capacity of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated”
e1“at 12 d after treatment plant height, stem diameter, leaf area, and leaf number of cucumber seedlings were stimulated by 56 mmol L-1 nitrate, whereas were inhibited significantly by 140 mmol L-1 nitrate compared with CK”
Claim · model-written summary
At 12 days, 140 mmol L-1 nitrate significantly inhibited plant height, stem diameter and leaf area of cucumber seedlings relative to CK.
- Taxon
- cucumberCucumis sativuse0
- Material
- Xintaimicie0
- Organ / stage
- seedlingse0
- Treatment
- 140 mmol L-1 nitratee1
- Outcome
- plant height, stem diameter, leaf areae1
- Direction
- inhibitede1
- Qualifier
- 12 d after treatmente1
- Comparator
- CKe1
- Setting
- hydroponic culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of three nitrate levels - 14(CK), 56(T-1), and 140 mmol L-1 (T-2) - on growth and photosynthetic capacity of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated”
e1“at 12 d after treatment plant height, stem diameter, leaf area, and leaf number of cucumber seedlings were stimulated by 56 mmol L-1 nitrate, whereas were inhibited significantly by 140 mmol L-1 nitrate compared with CK”
Claim · model-written summary
At 12 days, 140 mmol L-1 nitrate significantly inhibited leaf number of cucumber seedlings relative to CK.
- Taxon
- cucumberCucumis sativuse0
- Material
- Xintaimicie0
- Organ / stage
- seedlingse0
- Treatment
- 140 mmol L-1 nitratee1
- Outcome
- leaf numbere1
- Direction
- inhibitede1
- Qualifier
- 12 d after treatmente1
- Comparator
- CKe1
- Setting
- hydroponic culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of three nitrate levels - 14(CK), 56(T-1), and 140 mmol L-1 (T-2) - on growth and photosynthetic capacity of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated”
e1“at 12 d after treatment plant height, stem diameter, leaf area, and leaf number of cucumber seedlings were stimulated by 56 mmol L-1 nitrate, whereas were inhibited significantly by 140 mmol L-1 nitrate compared with CK”
Claim · model-written summary
Under T-1, photosynthetic rate was briefly stimulated and then recovered to the CK level.
- Taxon
- cucumberCucumis sativuse0
- Material
- Xintaimicie0
- Organ / stage
- seedlingse0
- Treatment
- T-1 treatmente1
- Outcome
- photosynthetic ratee1
- Direction
- increaseinferrede1
- Qualifier
- Short-terme1
- Comparator
- CKe1
- Setting
- hydroponic culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of three nitrate levels - 14(CK), 56(T-1), and 140 mmol L-1 (T-2) - on growth and photosynthetic capacity of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated”
e1“Short-term stimulation in photosynthetic rate occurred under T-1 treatment, and then recovered to the level of CK”
Claim · model-written summary
Under T-2, photosynthetic rate significantly decreased relative to CK over the treatment course.
- Taxon
- cucumberCucumis sativuse0
- Material
- Xintaimicie0
- Organ / stage
- seedlingse0
- Treatment
- 140 mmol L-1 (T-2)e0
- Outcome
- Photosynthetic ratee1
- Direction
- decreasede1
- Qualifier
- over treatment coursee1
- Comparator
- CKe1
- Setting
- hydroponic culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of three nitrate levels - 14(CK), 56(T-1), and 140 mmol L-1 (T-2) - on growth and photosynthetic capacity of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated”
e1“Photosynthetic rate of T-2 seedlings significantly decreased over treatment course with respect to CK”
Claim · model-written summary
Photosynthetic pigment content under T-1 increased during the first 2 days, then recovered to the CK level.
- Taxon
- cucumberCucumis sativuse0
- Material
- Xintaimicie0
- Organ / stage
- seedlingse0
- Treatment
- T-1e1
- Outcome
- Photosynthetic pigment contente1
- Direction
- increasede1
- Qualifier
- during the first 2 de1
- Comparator
- CKe1
- Setting
- hydroponic culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of three nitrate levels - 14(CK), 56(T-1), and 140 mmol L-1 (T-2) - on growth and photosynthetic capacity of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated”
e1“Photosynthetic pigment content of T-1 and T-2 increased during the first 2 d, and gradually recovered to the level of CK thereafter”
Claim · model-written summary
Photosynthetic pigment content under T-2 increased during the first 2 days, then recovered to the CK level.
- Taxon
- cucumberCucumis sativuse0
- Material
- Xintaimicie0
- Organ / stage
- seedlingse0
- Treatment
- T-2e1
- Outcome
- Photosynthetic pigment contente1
- Direction
- increasede1
- Qualifier
- during the first 2 de1
- Comparator
- CKe1
- Setting
- hydroponic culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of three nitrate levels - 14(CK), 56(T-1), and 140 mmol L-1 (T-2) - on growth and photosynthetic capacity of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated”
e1“Photosynthetic pigment content of T-1 and T-2 increased during the first 2 d, and gradually recovered to the level of CK thereafter”
Claim · model-written summary
Under T-1, chlorophyll a/b and carotenoids/chlorophyll did not differ significantly from CK.
- Taxon
- cucumberCucumis sativuse0
- Material
- Xintaimicie0
- Organ / stage
- seedlingse0
- Treatment
- T-1e1
- Outcome
- Chlorophyll a/b and carotenoids/chlorophylle1
- Direction
- no significant differencee1
- Qualifier
- during treatment periode1
- Comparator
- CKe1
- Setting
- hydroponic culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of three nitrate levels - 14(CK), 56(T-1), and 140 mmol L-1 (T-2) - on growth and photosynthetic capacity of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated”
e1“Chlorophyll a/b and carotenoids/chlorophyll of T-1 had no significant difference from CK during treatment period”
Claim · model-written summary
Under T-1, PSII efficiency and photochemical quenching did not differ significantly from CK.
- Taxon
- cucumberCucumis sativuse0
- Material
- Xintaimicie0
- Organ / stage
- seedlingse0
- Treatment
- T-1e1
- Outcome
- Actual PSII efficiency (ΦPSII) and photochemical quenching (qP)e1
- Direction
- no significant differencee1
- Comparator
- CKe1
- Setting
- hydroponic culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of three nitrate levels - 14(CK), 56(T-1), and 140 mmol L-1 (T-2) - on growth and photosynthetic capacity of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated”
e1“Actual PSII efficiency (ΦPSII) and photochemical quenching (qP) of T-1 had no significant difference from CK”
Claim · model-written summary
Under T-1, non-photochemical quenching was slightly higher than CK after 2 days.
- Taxon
- cucumberCucumis sativuse0
- Material
- Xintaimicie0
- Organ / stage
- seedlingse0
- Treatment
- T-1e1
- Outcome
- non-photochemical quenching (qN)e2
- Direction
- highere2
- Qualifier
- after 2 de2
- Comparator
- CKe2
- Setting
- hydroponic culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of three nitrate levels - 14(CK), 56(T-1), and 140 mmol L-1 (T-2) - on growth and photosynthetic capacity of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated”
e1“Actual PSII efficiency (ΦPSII) and photochemical quenching (qP) of T-1 had no significant difference from CK”
e2“and non-photochemical quenching (qN) was a little higher than CK after 2 d”
Claim · model-written summary
Under T-2, chlorophyll a/b and carotenoids/chlorophyll did not differ significantly from CK during the first 4 days.
- Taxon
- cucumberCucumis sativuse0
- Material
- Xintaimicie0
- Organ / stage
- seedlingse0
- Treatment
- T-2e1
- Outcome
- chlorophyll a/b and carotenoids/chlorophylle1
- Direction
- no significant differencee1
- Qualifier
- During the first 4 de1
- Comparator
- CKe1
- Setting
- hydroponic culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of three nitrate levels - 14(CK), 56(T-1), and 140 mmol L-1 (T-2) - on growth and photosynthetic capacity of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated”
e1“During the first 4 d, there was no significant difference in chlorophyll a/b and carotenoids/chlorophyll between T-2 and CK”
Claim · model-written summary
Under T-2, chlorophyll a/b increased gradually after 4 days.
- Taxon
- cucumberCucumis sativuse0
- Material
- Xintaimicie0
- Organ / stage
- seedlingse0
- Treatment
- T-2e1
- Outcome
- chlorophyll a/be1
- Direction
- increasede1
- Qualifier
- graduallye1
- Comparator
- CKe2
- Setting
- hydroponic culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of three nitrate levels - 14(CK), 56(T-1), and 140 mmol L-1 (T-2) - on growth and photosynthetic capacity of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated”
e1“After 4 d, chlorophyll a/b of T-2 increased gradually, whereas carotenoids/chlorophyll decreased”
e2“During the first 4 d, there was no significant difference in chlorophyll a/b and carotenoids/chlorophyll between T-2 and CK”
Claim · model-written summary
Under T-2, carotenoids/chlorophyll decreased after 4 days.
- Taxon
- cucumberCucumis sativuse0
- Material
- Xintaimicie0
- Organ / stage
- seedlingse0
- Treatment
- T-2e1
- Outcome
- carotenoids/chlorophylle1
- Direction
- decreasede1
- Comparator
- CKe2
- Setting
- hydroponic culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of three nitrate levels - 14(CK), 56(T-1), and 140 mmol L-1 (T-2) - on growth and photosynthetic capacity of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated”
e1“After 4 d, chlorophyll a/b of T-2 increased gradually, whereas carotenoids/chlorophyll decreased”
e2“During the first 4 d, there was no significant difference in chlorophyll a/b and carotenoids/chlorophyll between T-2 and CK”
Claim · model-written summary
Under T-2, PSII efficiency and photochemical quenching showed little difference from CK during the first 2 days.
- Taxon
- cucumberCucumis sativuse0
- Material
- Xintaimicie0
- Organ / stage
- seedlingse0
- Treatment
- T-2e1
- Outcome
- ΦPSII and qPe1
- Direction
- no_changeinferrede1
- Qualifier
- During the first 2 de1
- Comparator
- CKe1
- Setting
- hydroponic culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of three nitrate levels - 14(CK), 56(T-1), and 140 mmol L-1 (T-2) - on growth and photosynthetic capacity of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated”
e1“During the first 2 d, there was little difference in ΦPSII and qP between T-2 and CK”
Claim · model-written summary
Under T-2, PSII efficiency and photochemical quenching decreased to a great extent after 2 days.
- Taxon
- cucumberCucumis sativuse0
- Material
- Xintaimicie0
- Organ / stage
- seedlingse0
- Treatment
- T-2e1
- Outcome
- ΦPSII and qPe1
- Direction
- decreasede1
- Qualifier
- to a great extende1
- Comparator
- CKe2
- Setting
- hydroponic culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of three nitrate levels - 14(CK), 56(T-1), and 140 mmol L-1 (T-2) - on growth and photosynthetic capacity of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated”
e1“After 2 d, both ΦPSII and qP of T-2 decreased to a great extend”
e2“During the first 2 d, there was little difference in ΦPSII and qP between T-2 and CK”
Claim · model-written summary
Under T-2, non-photochemical quenching increased significantly over the treatment course.
- Taxon
- cucumberCucumis sativuse0
- Material
- Xintaimicie0
- Organ / stage
- seedlingse0
- Treatment
- T-2e1
- Outcome
- qNe1
- Direction
- increasee1
- Qualifier
- over treatment coursee1
- Setting
- hydroponic culturee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of three nitrate levels - 14(CK), 56(T-1), and 140 mmol L-1 (T-2) - on growth and photosynthetic capacity of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated”
e1“A significant increase in qN of T-2 occurred over treatment course”
Claim · model-written summary
Under T-1, Hill reaction activity decreased slightly relative to CK.
- Taxon
- cucumberCucumis sativuse0
- Material
- Xintaimicie0
- Organ / stage
- seedlingse0
- Treatment
- T-1e1
- Outcome
- Hill reaction activitye1
- Direction
- decreasede1
- Qualifier
- slightlye1
- Comparator
- CKe1
- Setting
- hydroponic culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of three nitrate levels - 14(CK), 56(T-1), and 140 mmol L-1 (T-2) - on growth and photosynthetic capacity of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated”
e1“With respect to CK, Hill reaction activity of T-1 slightly decreased”
Claim · model-written summary
Under T-2, Hill reaction activity decreased significantly relative to CK.
- Taxon
- cucumberCucumis sativuse0
- Material
- Xintaimicie0
- Organ / stage
- seedlingse0
- Treatment
- T-2 treatmente1
- Outcome
- Hill reaction activitye1
- Direction
- decreasee1
- Comparator
- CKe2
- Setting
- hydroponic culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of three nitrate levels - 14(CK), 56(T-1), and 140 mmol L-1 (T-2) - on growth and photosynthetic capacity of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated”
e1“T-2 treatment resulted in a significant decrease of Hill reaction activity”
e2“With respect to CK, Hill reaction activity of T-1 slightly decreased”
Claim · model-written summary
High-level nitrate stress may reduce photosynthesis through effects on stomatal conductance and on the photosynthetic apparatus.
- Taxon
- cucumberCucumis sativuse0
- Material
- Xintaimicie0
- Organ / stage
- seedlingse0
- Treatment
- high-level nitrate stresse1
- Outcome
- photosynthesise1
- Qualifier
- stomatal conductance but on the photosynthetic apparatuse1
- Setting
- hydroponic culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of three nitrate levels - 14(CK), 56(T-1), and 140 mmol L-1 (T-2) - on growth and photosynthetic capacity of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated”
e1“This evidence indicates that high-level nitrate stress may reduce photosynthesis through its effects not only on stomatal conductance but on the photosynthetic apparatus”
The same questions in other papers
nitrogen · growth · Cucumis sativus (cucumber)Positive and negative results
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