Abstract
The respiration of pea seeds during the early stages of germination was studied by manometric methods. From analyses of the germinating seeds estimates were obtained of the oxidized and reduced forms of glutathione and ascorbic acid. Thus it was possible to explore the relationship between these oxidation-reduction systems and the resumption of respiratory activities in the dormant seed. Several lines of evidence indicate that partial anaerobiosis is an important feature of metabolism during the first phases of germination in air. The intact testa, acting as a barrier to diffusion, limits the uptake of oxygen by the seed. Splitting of the testa by the development of the embryo leads to rapid changes in the mechanism and rate of respiration. An increase in the relative proportions of the reduced forms of both glutathione and ascorbic acid is associated with the establishment of anaerobic conditions in the seed. This and other available evidence indicate that the glutathione-ascorbic acid carrier system plays only a minor part in aerobic oxidations during the early stages of germination. The possibility that glutathione has an important influence on the activation of enzymes in the first phase of germination is briefly considered.
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Claims 5
Claim · model-written summary
Partial anaerobiosis is a feature of early germination in air.
- Taxon
- Peas
Lathyrus oleraceust0 - Organ / stage
- first phases of germinatione0
- Outcome
- partial anaerobiosise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“partial anaerobiosis is an important feature of metabolism during the first phases of germination in air”
t0“Peas”
Claim · model-written summary
The intact testa limits seed oxygen uptake by impeding diffusion.
- Taxon
- PeasLathyrus oleraceust0
- Organ / stage
- intact testae0
- Outcome
- uptake of oxygen by the seede0
- Qualifier
- barrier to diffusione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The intact testa, acting as a barrier to diffusion, limits the uptake of oxygen by the seed.”
t0“Peas”
Claim · model-written summary
Embryo-driven splitting of the testa rapidly changes respiration mechanism and rate.
- Taxon
- PeasLathyrus oleraceust0
- Organ / stage
- development of the embryoe0
- Outcome
- mechanism and rate of respiratione0
- Qualifier
- Splitting of the testae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Splitting of the testa by the development of the embryo leads to rapid changes in the mechanism and rate of respiration.”
t0“Peas”
Claim · model-written summary
Reduced glutathione and ascorbic acid proportions increase with anaerobic conditions.
- Taxon
- PeasLathyrus oleraceust0
- Organ / stage
- seede0
- Outcome
- relative proportions of the reduced forms of both glutathione and ascorbic acide0
- Direction
- increasee0
- Qualifier
- establishment of anaerobic conditions in the seede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An increase in the relative proportions of the reduced forms of both glutathione and ascorbic acid is associated with the establishment of anaerobic conditions in the seed.”
t0“Peas”
Claim · model-written summary
The glutathione-ascorbic acid carrier system contributes only a minor part of aerobic oxidation in early germination.
- Taxon
- PeasLathyrus oleraceust0
- Organ / stage
- early stages of germinatione0
- Outcome
- aerobic oxidationse0
- Qualifier
- glutathione-ascorbic acid carrier systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the glutathione-ascorbic acid carrier system plays only a minor part in aerobic oxidations during the early stages of germination”
t0“Peas”