Abstract
When 3- to 4-day-old dark-grown maize (Zea mays L. WF9 x Bear 38) seedlings are given red light, auxin-binding activity localized on endoplasmic reticulum membranes of the mesocotyl begins to decrease after 4 hours; by 9 hours, it falls to 50 to 60% of that in dark controls, on either a fresh weight or total particulate protein basis. Endoplasmic reticulum-localized NADH:cytochrome c reductase activity decreases in parallel. Loss of binding is due to decrease in number of sites, with no change in their affinity for auxin (K(d) 0.2 micromolar for naphthalene-1-acetic acid). Elongation of mesocotyl segments in response to auxin decreases with a similar time course. Elongation of segments from irradiated plants shows the same apparent affinity for auxin as that of the dark controls. Auxin-binding activity and elongation response also decrease in parallel down the length of the mesocotyl. These observations are consistent with a role of endoplasmic reticulum-localized auxin binding sites as receptors for auxin action in cell elongation.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
Red light decreased maize mesocotyl auxin-binding activity after 4 hours to 50 to 60% of dark controls by 9 hours.
- Organ / stage
- mesocotyle0
- Treatment
- red lighte0
- Outcome
- auxin-binding activitye0
- Direction
- decreasee0
- Value
- 50 to 60%e0
- Comparator
- dark controlse0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When 3- to 4-day-old dark-grown maize (Zea mays L. WF9 x Bear 38) seedlings are given red light, auxin-binding activity localized on endoplasmic reticulum membranes of the mesocotyl begins to decrease after 4 hours; by 9 hours, it falls to 50 to 60% of that in dark controls”
Claim · model-written summary
Endoplasmic reticulum NADH:cytochrome c reductase activity decreased in parallel.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“Endoplasmic reticulum-localized NADH:cytochrome c reductase activity decreases in parallel.”
Claim · model-written summary
Red light reduced the number of auxin-binding sites.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“Loss of binding is due to decrease in number of sites”
e1“seedlings are given red light”
Claim · model-written summary
Auxin-binding site affinity remained unchanged at K(d) 0.2 micromolar for naphthalene-1-acetic acid.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“with no change in their affinity for auxin (K(d) 0.2 micromolar for naphthalene-1-acetic acid)”
Claim · model-written summary
Mesocotyl segment elongation in response to auxin decreased on a similar time course.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“Elongation of mesocotyl segments in response to auxin decreases with a similar time course.”
Claim · model-written summary
Irradiated and dark-control segments showed the same apparent auxin affinity for elongation.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“Elongation of segments from irradiated plants shows the same apparent affinity for auxin as that of the dark controls.”
Claim · model-written summary
Auxin-binding activity and elongation response decreased together along the mesocotyl.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“Auxin-binding activity and elongation response also decrease in parallel down the length of the mesocotyl.”
Claim · model-written summary
The observations support auxin-binding sites on endoplasmic reticulum as receptors for auxin-driven elongation.
- Outcome
- cell elongatione0
- Qualifier
- endoplasmic reticulum-localized auxin binding sites as receptors for auxin actione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“These observations are consistent with a role of endoplasmic reticulum-localized auxin binding sites as receptors for auxin action in cell elongation.”
The same questions in other papers
light · physiology: hormones · Zea mays (maize)Results differ
2 papers in the same direction as this paper · 2 in the opposite direction
- negative
- positive
- positive
1 paper more in this group
See all 5 papers →class · growth · Zea mays (maize)Positive and negative results
14 papers in the same direction as this paper · 53 in the opposite direction
- positive
- positive
- positive
64 papers more in this group
See all 68 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.