Claim · model-written summary
Very low light intensities inhibited growth of the first internode but not that of the coleoptile.
AvenaNot reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Avena”
e0“Very low intensities of light inhibited growth of the first internode but not that of the coleoptile”
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 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.
- Observation In darkness the average cell length of the internode increased 30 times.
- 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.