Abstract
Abstract Growth redistribution which occurs as a result of phototropic stimulation was studied in red light‐grown, maize ( Zea mays L.) seedlings. The pattern of elongation of small areas (0.1mm 2 ) of coleoptile epidermis on intact plants was analysed from time‐lapse, photomicrographic records. Growth following unilateral, pulse irradiation with blue light was depressed on the illuminated side and was stimulated on the shaded side. The time at which the change in growth rate occurred, on both illuminated and shaded sides, was significantly earlier in apical patches than it was in basal patches. Both kinds of change in the growth rate (stimulation and depression) occurred rapidly such that a new, constant growth rate was often established within five minutes. Micrographic, time‐lapse records were also obtained of growth changes induced by sub‐apical, unilateral application of a spot of an indole‐3‐acetic acid (IAA) and lanolin mixture. Growth on the side of the coleoptile to which IAA had been applied was similar to the growth on shaded sides of phototropically stimulated plants. The distance between apical and basal patches and the elapsed time between their changes in growth rate gave a velocity at which the growth response moved basipetally. Calculation of this velocity for blue light and auxin treatment gave values that were not significantly different. Thus, basipetal movement of a transverse auxin gradient could mediate growth changes that cause curvature of the coleoptile towards first positive fluences of blue light.
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Claims 7
Claim · model-written summary
Blue-light irradiation depressed growth on the illuminated side.
- Treatment
- unilateral, pulse irradiation with blue lighte0
- Outcome
- Growthe0
- Direction
- depressede0
- Qualifier
- illuminated sidee0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth following unilateral, pulse irradiation with blue light was depressed on the illuminated side and was stimulated on the shaded side.”
t0“maize”
Claim · model-written summary
Blue-light irradiation stimulated growth on the shaded side.
- Treatment
- unilateral, pulse irradiation with blue lighte0
- Outcome
- Growthe0
- Direction
- stimulatede0
- Qualifier
- shaded sidee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth following unilateral, pulse irradiation with blue light was depressed on the illuminated side and was stimulated on the shaded side.”
t0“maize”
Claim · model-written summary
Growth-rate changes occurred significantly earlier in apical than basal patches.
- Organ / stage
- apical patchese0
- Outcome
- time at which the change in growth rate occurrede0
- Direction
- earliere0
- Comparator
- basal patchese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The time at which the change in growth rate occurred, on both illuminated and shaded sides, was significantly earlier in apical patches than it was in basal patches.”
t0“maize”
Claim · model-written summary
The changed growth rate was often established within five minutes.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both kinds of change in the growth rate (stimulation and depression) occurred rapidly such that a new, constant growth rate was often established within five minutes.”
t0“maize”
Claim · model-written summary
IAA application produced coleoptile growth similar to the shaded side of phototropically stimulated plants.
- Treatment
- IAAe0
- Outcome
- Growthe0
- Direction
- similare0
- Comparator
- shaded sides of phototropically stimulated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth on the side of the coleoptile to which IAA had been applied was similar to the growth on shaded sides of phototropically stimulated plants.”
t0“maize”
Claim · model-written summary
Basipetal response velocities after blue light and auxin treatment were not significantly different.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Calculation of this velocity for blue light and auxin treatment gave values that were not significantly different.”
t0“maize”
Claim · model-written summary
A basipetally moving transverse auxin gradient could mediate coleoptile curvature toward blue light.
- Compound
- auxine0
- Outcome
- curvature of the coleoptile towards first positive fluences of blue lighte0
- Qualifier
- basipetal movement of a transverse auxin gradiente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thus, basipetal movement of a transverse auxin gradient could mediate growth changes that cause curvature of the coleoptile towards first positive fluences of blue light.”
t0“maize”
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