Abstract
Electron microscopic examination of leaves from bean (Phaseolus vulgaris L.) tobacco (Nicotiana tabacum L.) and cotton (Gossipyum hirsutum L.) fumigated for .5 to 2 hours with 0.3 - 1 ppm of the individual oxidants revealed that changes in the ultrastructure of the cells occurred in a sequential fashion with time following the fumigation period. Although occasional cells showed severe damage immediately after fumigation, the most obvious change was an enhanced clarity of the cell membranes. Subsequently, and often prior to the appearance of any visual symptoms of damage, changes in the chloroplasts and mitochondria are observed. In bean and cotton the chloroplast stroma becomes denser and ordered arrays of granules and fibrils develop in the stroma. In tobacco the ordered arrays of granules did not occur but the stroma increased in density and grana frequently had a curvilinear appearance. However, determination of chloroplast axial ratios indicated a general decrease in volume of the tobacco chloroplasts in the fumigated plants as compared to control non-treated plants. The increase density of the stroma, formation of fibrils, and general decrease in volume is probably the result of an increase dehydration of the chloroplasts brought on by permeability changes induced by the pollutants.
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Claims 9
Claim · model-written summary
Fumigated bean leaves showed denser chloroplast stroma.
- Taxon
- beane1
- Organ / stage
- chloroplast stromae0
- Treatment
- fumigatede1
- Outcome
- chloroplast stromae0
- Direction
- densere0
Not reportedComparator
Verbatim
e0“In bean and cotton the chloroplast stroma becomes denser and ordered arrays of granules and fibrils develop in the stroma.”
e1“leaves from bean (Phaseolus vulgaris L.) tobacco (Nicotiana tabacum L.) and cotton (Gossipyum hirsutum L.) fumigated for .5 to 2 hours with 0.3 - 1 ppm of the individual oxidants”
Claim · model-written summary
Fumigated cotton leaves showed denser chloroplast stroma.
- Taxon
- cotton
Gossypium hirsutume1 - Treatment
- fumigatede1
- Outcome
- chloroplast stromae0
- Direction
- densere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In bean and cotton the chloroplast stroma becomes denser and ordered arrays of granules and fibrils develop in the stroma.”
e1“cotton (Gossipyum hirsutum L.) fumigated for .5 to 2 hours with 0.3 - 1 ppm of the individual oxidants”
Claim · model-written summary
Ordered granule and fibril arrays developed in bean chloroplast stroma after fumigation.
Not reportedComparator
Verbatim
e0“In bean and cotton the chloroplast stroma becomes denser and ordered arrays of granules and fibrils develop in the stroma.”
e1“bean (Phaseolus vulgaris L.) tobacco (Nicotiana tabacum L.) and cotton (Gossipyum hirsutum L.) fumigated”
Claim · model-written summary
Ordered granule and fibril arrays developed in cotton chloroplast stroma after fumigation.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- fumigatede1
- Outcome
- ordered arrays of granules and fibrilse0
- Direction
- develope0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In bean and cotton the chloroplast stroma becomes denser and ordered arrays of granules and fibrils develop in the stroma.”
e1“cotton (Gossipyum hirsutum L.) fumigated”
Claim · model-written summary
Tobacco chloroplast stroma increased in density after oxidant fumigation.
- Taxon
- tobacco
Nicotiana tabacume1 - Treatment
- fumigatede1
- Outcome
- stromae0
- Direction
- increased in densitye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In tobacco the ordered arrays of granules did not occur but the stroma increased in density and grana frequently had a curvilinear appearance.”
e1“tobacco (Nicotiana tabacum L.) and cotton (Gossipyum hirsutum L.) fumigated”
Claim · model-written summary
Ordered granule arrays did not occur in tobacco chloroplasts after fumigation.
- Taxon
- tobaccoNicotiana tabacume1
- Treatment
- fumigatede1
- Outcome
- ordered arrays of granulese0
- Direction
- did not occure0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In tobacco the ordered arrays of granules did not occur but the stroma increased in density and grana frequently had a curvilinear appearance.”
e1“tobacco (Nicotiana tabacum L.) and cotton (Gossipyum hirsutum L.) fumigated”
Claim · model-written summary
Tobacco grana frequently had a curvilinear appearance after fumigation.
- Taxon
- tobaccoNicotiana tabacume1
- Treatment
- fumigatede1
- Outcome
- grana frequently had a curvilinear appearancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In tobacco the ordered arrays of granules did not occur but the stroma increased in density and grana frequently had a curvilinear appearance.”
e1“tobacco (Nicotiana tabacum L.) and cotton (Gossipyum hirsutum L.) fumigated”
Claim · model-written summary
Tobacco chloroplast volume generally decreased in fumigated plants compared with untreated controls.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- fumigated plantse0
- Outcome
- volume of the tobacco chloroplastse0
- Direction
- decreasee0
- Comparator
- control non-treated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a general decrease in volume of the tobacco chloroplasts in the fumigated plants as compared to control non-treated plants.”
Claim · model-written summary
The authors suggest pollutant-induced permeability changes cause chloroplast dehydration and ultrastructural changes.
- Taxon
- tobaccoNicotiana tabacume1
- Organ / stage
- chloroplastse0
- Treatment
- pollutantse0
- Outcome
- increase dehydration of the chloroplastse0
- Qualifier
- permeability changese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increase density of the stroma, formation of fibrils, and general decrease in volume is probably the result of an increase dehydration of the chloroplasts brought on by permeability changes induced by the pollutants.”
e1“tobacco (Nicotiana tabacum L.)”