Claim · model-written summary
In darkness the average cell length of the internode increased 30 times.
AvenaNot reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Avena”
e0“the average cell length increased by 30 times”
Title
George S. Avery,; Paul R. Burkholder; Harriet B. Creighton Botanical Gazette 1937. doi:10.1086/334694
Other claims from this paper (18)
- Observation The ratio of first-internode length to coleoptile length differed markedly among twenty Avena varieties germinated in darkness.
- Intervention effect Final length of the first internode of Avena sativa var. Victory varied inversely with the intensity of weak Mazda light.
- Intervention effect Internode elongation was inhibited in proportion to Neon light intensity at intensities below 0.1 erg/mm.2/sec.
- Observation In Victory oats the internode elongated slightly during early swelling (up to thirty-six hours) in both light and darkness.
- Observation In darkness further polarized growth occurred in the internode.
- Observation In strong light growth ceased early in the internode and shifted to the coleoptile.
- Intervention effect Very low light intensities inhibited growth of the first internode but not that of the coleoptile.
- Intervention effect High light intensities inhibited growth of the internode.
- Intervention effect High light intensities appreciably shortened the coleoptile by decreasing the number of cells as well as cell length.
- Observation In complete absence of light the internode grew extensively.
- Intervention effect In complete absence of light the coleoptile was somewhat shorter than in plants that received small amounts of light in early germination.
- Mechanism Both cell division and cell enlargement were responsible for polarized growth of the first internode under different Mazda light intensities.
- Observation During early germination cell enlargement occurred in the first internode whether seedlings were grown in light or darkness.
- Observation In later development cell division occurred in darkness and under very low intensities but not in bright light.
- Intervention effect The size of dividing cells during early germination in darkness was somewhat less than in cells of internodes grown in light.
- Observation In darkness the number of internode cells increased 8.5 times from embryo to maturity.
- Mechanism The shortening of the first internode by light was brought about primarily by inhibition of cell division.
- Mechanism The influencing factors are suggested to involve substances necessary for cell division that light renders ineffective or diverts in their path of movement.