Abstract
The surface density of stacked and total thylakoid membranes in chloroplasts was determined morphometrically using the method of vertical sections. The degree of stacking, defined as the fraction of the total membrane area which is involved in stacking, was calculated from the surface densities and found to be 0.70 for chloroplasts of lettuce grown under field conditions. An average membrane area of 500 microns 2 for the thylakoids in a chloroplast was obtained from the surface density and the average volume of the chloroplasts (11.6 microns 3, estimated by means of equivalent oblate spheroids). The advantage of the morphometric method over alternative techniques and the relevance of the results with respect to the topology of thylakoid membranes are discussed.
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Claims 3
Claim · model-written summary
The fraction of thylakoid membrane area involved in stacking in field-grown lettuce chloroplasts was 0.70.
- Taxon
- lettuce
Lactuca sativae0 - Outcome
- degree of stackinge0
- Value
- 0.70e0
- Setting
- field conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The degree of stacking, defined as the fraction of the total membrane area which is involved in stacking, was calculated from the surface densities and found to be 0.70 for chloroplasts of lettuce grown under field conditions.”
Claim · model-written summary
Average thylakoid membrane area per lettuce chloroplast was 500 microns 2.
- Taxon
- lettuceLactuca sativat0
- Outcome
- average membrane areae0
- Value
- 500 microns 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An average membrane area of 500 microns 2 for the thylakoids in a chloroplast was obtained from the surface density and the average volume of the chloroplasts (11.6 microns 3, estimated by means of equivalent oblate spheroids).”
t0“lettuce”
Claim · model-written summary
Average lettuce chloroplast volume was estimated as 11.6 microns 3.
- Taxon
- lettuceLactuca sativat0
- Outcome
- average volume of the chloroplastse0
- Value
- 11.6 microns 3e0
- Qualifier
- estimated by means of equivalent oblate spheroidse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the average volume of the chloroplasts (11.6 microns 3, estimated by means of equivalent oblate spheroids)”
t0“lettuce”