Abstract
The final lengths of intact dark-grown coleoptiles vary with species and cultivar. The growth distribution pattern in the apical 25-mm growing zone and the absolute amount of growth in each zone depend on the age and species of the coleoptile. A comparative study of several cultivars of wheat, Triticum vulgare, and barley, Hordeum vulgare, indicates that the growth distribution pattern in 30- to 38-mm coleoptiles varies with the species and cultivar. In barley, there are two patterns of growth distribution among the several cultivars, whereas in wheat, all cultivars exhibit a common zonal growth pattern. The total growth of coleoptiles, initially 30 to 38 mm in length, during a 24-hour dark incubation period is the same in dark-grown coleoptiles as in those irradiated with 3 minutes of red (660 nm) light prior to the incubation period. The growth distribution pattern in the growing zone of this 30- to 38-mm coleoptile is, however, altered by red light. Growth of the apical 5-mm zone is stimulated by red light and the zonal growth 5 to 10 mm below the apex is only slightly affected, whereas growth in the zones 10 to 15 to 20, and 20 to 25 mm below the apex is inhibited. This growth distribution pattern in irradiated coleoptiles changes as the coleoptile increases in length. The response of a zone following exposure to red light is dependent upon the age of the seedlings irradiated. The over-all effect of red light on growth of the intact coleoptile varies with the length of the coleoptile. In young seedling 20 to 29 mm in length, the cells of the coleoptile can compensate for the effects of red light, with the over-all growth of the dark-grown and irradiated coleoptile about the same. As the seedling grows older, the cells of the coleoptile can no longer make up for the effects of red light, and the over-all effect changes from compensation to pronounced inhibition.
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Claims 11
Claim · model-written summary
Growth distribution pattern in the apical 25-mm growing zone and absolute growth per zone depend on coleoptile age and species.
- Taxon
- Wheat and Barley
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Hordeum vulgare
Triticum aestivumt0 - Organ / stage
- apical 25-mm growing zonee1
- Outcome
- growth distribution patterne1
- Qualifier
- depend on the age and speciese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“Effects of Red Light on the Growth of Intact Wheat and Barley Coleoptiles”
e1“The growth distribution pattern in the apical 25-mm growing zone and the absolute amount of growth in each zone depend on the age and species of the coleoptile”
Claim · model-written summary
In barley, two growth distribution patterns occur among the several cultivars.
- Taxon
- barleyHordeum vulgaree2
- Material
- several cultivarse2
- Outcome
- growth distributione2
- Qualifier
- two patternse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“In barley, there are two patterns of growth distribution among the several cultivars”
Claim · model-written summary
In wheat, all cultivars showed a common zonal growth pattern.
- Taxon
- wheatTriticum aestivume3
- Material
- all cultivarse3
- Outcome
- zonal growth patterne3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“in wheat, all cultivars exhibit a common zonal growth pattern”
Claim · model-written summary
Red light irradiation for 3 minutes did not change total growth of 30 to 38 mm coleoptiles during a 24-hour dark incubation compared with dark-grown coleoptiles.
- Taxon
- Wheat and BarleyHordeum vulgareTriticum aestivumt0
- Organ / stage
- coleoptilese4
- Treatment
- 3 minutes of red (660 nm) lighte4
- Outcome
- total growthe4
- Direction
- is the samee4
- Qualifier
- 24-hour dark incubation periode4
- Comparator
- dark-grown coleoptilese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effects of Red Light on the Growth of Intact Wheat and Barley Coleoptiles”
e4“The total growth of coleoptiles, initially 30 to 38 mm in length, during a 24-hour dark incubation period is the same in dark-grown coleoptiles as in those irradiated with 3 minutes of red (660 nm) light”
Claim · model-written summary
Red light stimulated growth of the apical 5-mm zone.
- Taxon
- Wheat and BarleyHordeum vulgareTriticum aestivumt0
- Organ / stage
- apical 5-mm zonee5
- Treatment
- red lighte5
- Outcome
- Growth of the apical 5-mm zonee5
- Direction
- is stimulatede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effects of Red Light on the Growth of Intact Wheat and Barley Coleoptiles”
e5“Growth of the apical 5-mm zone is stimulated by red light”
Claim · model-written summary
Red light only slightly affected zonal growth 5 to 10 mm below the apex.
- Taxon
- Wheat and BarleyHordeum vulgareTriticum aestivumt0
- Treatment
- red lighte5
- Outcome
- zonal growth 5 to 10 mm below the apexe6
- Direction
- only slightly affectede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effects of Red Light on the Growth of Intact Wheat and Barley Coleoptiles”
e6“the zonal growth 5 to 10 mm below the apex is only slightly affected”
e5“Growth of the apical 5-mm zone is stimulated by red light”
Claim · model-written summary
Red light inhibited growth in the zones 10 to 15 to 20 and 20 to 25 mm below the apex.
- Taxon
- Wheat and BarleyHordeum vulgareTriticum aestivumt0
- Treatment
- red lighte5
- Outcome
- growth in the zones 10 to 15 to 20, and 20 to 25 mm below the apexe7
- Direction
- is inhibitede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effects of Red Light on the Growth of Intact Wheat and Barley Coleoptiles”
e7“growth in the zones 10 to 15 to 20, and 20 to 25 mm below the apex is inhibited”
e5“Growth of the apical 5-mm zone is stimulated by red light”
Claim · model-written summary
The growth distribution pattern in irradiated coleoptiles changes as the coleoptile lengthens.
- Taxon
- Wheat and BarleyHordeum vulgareTriticum aestivumt0
- Outcome
- growth distribution pattern in irradiated coleoptilese0
- Qualifier
- changes as the coleoptile increases in lengthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effects of Red Light on the Growth of Intact Wheat and Barley Coleoptiles”
e0“This growth distribution pattern in irradiated coleoptiles changes as the coleoptile increases in length”
Claim · model-written summary
The zonal response to red light depends on the age of the seedlings irradiated.
- Taxon
- Wheat and BarleyHordeum vulgareTriticum aestivumt0
- Outcome
- response of a zone following exposure to red lighte0
- Qualifier
- dependent upon the age of the seedlings irradiatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effects of Red Light on the Growth of Intact Wheat and Barley Coleoptiles”
e0“The response of a zone following exposure to red light is dependent upon the age of the seedlings irradiated”
Claim · model-written summary
In 20 to 29 mm seedlings, red light and dark-grown coleoptiles have about the same over-all growth because the cells compensate.
- Taxon
- Wheat and BarleyHordeum vulgareTriticum aestivumt0
- Organ / stage
- coleoptilee0
- Treatment
- red lighte0
- Outcome
- over-all growthe0
- Direction
- about the samee0
- Qualifier
- young seedling 20 to 29 mm in lengthe0
- Comparator
- dark-growne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effects of Red Light on the Growth of Intact Wheat and Barley Coleoptiles”
e0“In young seedling 20 to 29 mm in length, the cells of the coleoptile can compensate for the effects of red light, with the over-all growth of the dark-grown and irradiated coleoptile about the same”
Claim · model-written summary
In older seedlings, the over-all effect of red light changes from compensation to pronounced inhibition.
- Taxon
- Wheat and BarleyHordeum vulgareTriticum aestivumt0
- Organ / stage
- coleoptilee0
- Treatment
- red lighte0
- Outcome
- over-all effecte0
- Direction
- changes from compensation to pronounced inhibitione0
- Qualifier
- As the seedling grows oldere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effects of Red Light on the Growth of Intact Wheat and Barley Coleoptiles”
e0“As the seedling grows older, the cells of the coleoptile can no longer make up for the effects of red light, and the over-all effect changes from compensation to pronounced inhibition”
The same questions in other papers
light · growth · Hordeum vulgare (barley)Positive and negative results
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- positive
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- positive
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See all 85 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.