Claim · model-written summary
Older plants with green leaf surface had a less severe reduction in relative growth rate under cold.
- Treatment
- a period of low temperaturee1
- Outcome
- relative growth ratee1
- Direction
- less severee1
- Comparator
- Young seedlingse2
Zea maysNot reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zea mays L.”
e1“When a period of low temperature is given to older plants, which already have some green leaf surface, the reduction in relative growth rate and photosynthesis is less severe”
e2“Young seedlings”
Title
Th. Alberda Acta Botanica Neerlandica 1969. doi:10.1111/j.1438-8677.1969.tb00568.x
Other claims from this paper (12)
- Intervention effect Young maize seedlings scarcely grew at 15 °C or lower.
- Observation Young maize leaves were yellowish under low temperature.
- Observation Young maize seedling leaf chlorophyll concentration was below 10 μg (a+b) per cm2.
- Observation Young maize seedling photosynthesis was negligible under low temperature.
- Intervention effect Older plants with green leaf surface had a less severe reduction in photosynthesis under cold than young seedlings.
- Observation Only leaf parts elongating during cold treatment became yellow.
- Association Day temperature influenced chlorophyll concentration in growing maize leaf parts.
- Intervention effect Low night temperatures left maize plants fully green.
- Intervention effect Low night temperatures virtually did not affect maize growth rate.
- Association Photosynthesis rate was suggested to decline when chlorophyll (a+b) concentration fell below 40μg per cm-2.
- Intervention effect After return to 20 ° or higher, maize photosynthesis rate soon reached normal values.
- Intervention effect After return to 20 ° or higher, maize growth rate soon reached normal values.