Abstract
Hydroponically cultured cucumber plants supplied with 4 μᴍ Fe chelated either with EDTA or citrate and treated with Cd (10 μᴍ) and Pb (10, 50 μᴍ) from their one- or fourleaf stage were grown up to five-week-old age. The decrease in the chlorophyll content was the most pronounced in plants treated with Cd from a younger age, and in the case of Fecitrate. The chlorophyll a/b ratio of Cd stressed plants was also significantly lowered. In later treated plants the accumulation of chlorophyll was inhibited and the chlorophyll a/b ratio decreased only in the vigorously growing young leaves. Pb treatment had only a slight effect on both parameters. The changes in the chlorophyll-protein pattern of thylakoids were strongly related to their chlorophyll content but the response of each complex was different. Cd reduced the amount of chlorophyll containing complexes in the order of photosystem I > light-harvesting complex II > photosystem Il-core, while light-harvesting complex II appeared somewhat more sensitive than photosystem I in Pb treated plants. In accordance, a decline or blue shift of the long wavelength fluorescence emission band of chloroplasts was observed referring to disturbances also in photosystem I antenna assembly. The accumulation of chlorophyll and chlorophyll-proteins did not show close relationship to the heavy metal content of leaves which was the highest in the first of the intensively expanding leaves in the time of the treatment. The extraordinary sensitivity of photosystem I, and the relative stability of photosystem II under Cd treatment were similar to the case found in iron deficient plants. However, the pattern of chlorophyll content of leaf storeys of Cd treated plants rather followed the changes in their Mn content
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Claims 12
Claim · model-written summary
Cadmium caused the strongest chlorophyll decrease with younger exposure and Fe citrate.
- Taxon
- cucumber
Cucumis sativust0 - Treatment
- Cd (10 μᴍ)e1
- Outcome
- chlorophyll contente0
- Direction
- decreasee0
- Qualifier
- from a younger age, and in the case of Fecitratee0
- Comparator
- Pb (10, 50 μᴍ)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decrease in the chlorophyll content was the most pronounced in plants treated with Cd from a younger age, and in the case of Fecitrate”
t0“cucumber”
e1“supplied with 4 μᴍ Fe chelated either with EDTA or citrate and treated with Cd (10 μᴍ) and Pb (10, 50 μᴍ)”
Claim · model-written summary
Cadmium significantly lowered the chlorophyll a/b ratio.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Cd (10 μᴍ)e1
- Outcome
- chlorophyll a/b ratioe0
- Direction
- lowerede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The chlorophyll a/b ratio of Cd stressed plants was also significantly lowered”
t0“cucumber”
e1“treated with Cd (10 μᴍ) and Pb (10, 50 μᴍ)”
Claim · model-written summary
Later cadmium treatment inhibited chlorophyll accumulation in vigorously growing young leaves.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- vigorously growing young leavese0
- Treatment
- Cd (10 μᴍ)e1
- Outcome
- accumulation of chlorophylle0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In later treated plants the accumulation of chlorophyll was inhibited and the chlorophyll a/b ratio decreased only in the vigorously growing young leaves”
t0“cucumber”
e1“treated with Cd (10 μᴍ)”
Claim · model-written summary
Later cadmium treatment decreased the chlorophyll a/b ratio only in vigorously growing young leaves.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- vigorously growing young leavese0
- Treatment
- Cd (10 μᴍ)e1
- Outcome
- chlorophyll a/b ratioe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In later treated plants the accumulation of chlorophyll was inhibited and the chlorophyll a/b ratio decreased only in the vigorously growing young leaves”
t0“cucumber”
e1“treated with Cd (10 μᴍ)”
Claim · model-written summary
Lead had only slight effects on chlorophyll content and a/b ratio.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Pb treatmente0
- Outcome
- chlorophyll contente1
- Qualifier
- slight effecte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pb treatment had only a slight effect on both parameters”
e1“The decrease in the chlorophyll content”
e2“the chlorophyll a/b ratio decreased only”
t0“cucumber”
Claim · model-written summary
Cadmium reduced chlorophyll-containing complexes most for photosystem I and least for photosystem II core.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Cde0
- Outcome
- amount of chlorophyll containing complexese0
- Direction
- reducede0
- Qualifier
- photosystem I > light-harvesting complex II > photosystem Il-coree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cd reduced the amount of chlorophyll containing complexes in the order of photosystem I > light-harvesting complex II > photosystem Il-core”
t0“cucumber”
Claim · model-written summary
Under lead, light-harvesting complex II appeared more sensitive than photosystem I.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Pbe0
- Outcome
- light-harvesting complex IIe0
- Direction
- more sensitivee0
- Comparator
- photosystem Ie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“light-harvesting complex II appeared somewhat more sensitive than photosystem I in Pb treated plants”
t0“cucumber”
Claim · model-written summary
Long-wavelength chloroplast fluorescence declined or shifted blue.
- Taxon
- cucumberCucumis sativust0
- Outcome
- long wavelength fluorescence emission band of chloroplastse0
- Direction
- decline or blue shifte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a decline or blue shift of the long wavelength fluorescence emission band of chloroplasts was observed”
t0“cucumber”
Claim · model-written summary
Chlorophyll and chlorophyll-protein accumulation showed no close relationship with leaf heavy-metal content.
- Taxon
- cucumberCucumis sativust0
- Compound
- heavy metale0
- Outcome
- accumulation of chlorophyll and chlorophyll-proteinse0
- Direction
- did not show close relationshipe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The accumulation of chlorophyll and chlorophyll-proteins did not show close relationship to the heavy metal content of leaves”
t0“cucumber”
Claim · model-written summary
Leaf heavy-metal content was highest in the first intensively expanding leaves at treatment.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- first of the intensively expanding leavese0
- Outcome
- heavy metal content of leavese0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“heavy metal content of leaves which was the highest in the first of the intensively expanding leaves in the time of the treatment”
t0“cucumber”
Claim · model-written summary
Cadmium treatment showed exceptional photosystem I sensitivity and relative photosystem II stability.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Cd treatmente0
- Outcome
- extraordinary sensitivity of photosystem I, and the relative stability of photosystem IIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The extraordinary sensitivity of photosystem I, and the relative stability of photosystem II under Cd treatment”
t0“cucumber”
Claim · model-written summary
Cadmium-treated leaf chlorophyll patterns followed manganese-content changes.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Cde0
- Compound
- Mne0
- Outcome
- pattern of chlorophyll content of leaf storeyse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the pattern of chlorophyll content of leaf storeys of Cd treated plants rather followed the changes in their Mn content”
t0“cucumber”
The same questions in other papers
cadmium atom · physiology: pigments · Cucumis sativus (cucumber)Results agree
5 papers in the same direction as this paper
- negative
- negative
- negative
2 papers more in this group
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.