Claim · model-written summary
Catalase per ovule decreased rapidly after seed ripening began as water content fell.
Verbatim
e0“after the ripening process begins, it decreases rapidly with decrease of water content.”
e1“It increases per ovule as the seed grows”
e2“Catalase in ripening seeds decreases per unit both of wet and of dry weight.”
Title
Divergence of Catalase and Respiration in Germination
Louisa E. Rhine Botanical Gazette 1924. doi:10.1086/333355
Other claims from this paper (16)
- Observation Catalase decreased in early germination in six seed kinds.
- Observation Catalase rose after its initial decrease during germination.
- Observation Catalase slowly decreased almost to exhaustion in seeds soaked for a prolonged period in oxygen-free water.
- Observation Catalase decreased in the embryo of germinating wheat.
- Observation Catalase decreased in the endosperm of germinating wheat.
- Observation Catalase subsequently rose in the wheat embryo.
- Observation Catalase subsequently rose in the wheat endosperm to a much lesser extent.
- Method / resource A respirometer permits repeated direct oxygen and carbon dioxide measurements on large samples.
- Observation Respiration rose immediately when seeds were placed under germinating conditions.
- Observation The early respiration curve diverged from the typical germination catalase curve.
- Observation Catalase per unit wet weight decreased in ripening seeds.
- Observation Catalase per unit dry weight decreased in ripening seeds.
- Observation Catalase per ovule increased as seeds grew.
- Mechanism Catalase production was indirectly connected with oxidation.
- Mechanism The authors propose that hydrogen peroxide could stimulate catalase production.
- Recommendation The authors recommend using catalase as a metabolic indicator only where respiration does not change rapidly.