Abstract
Thirty-four chromosomal interchanges are reported, the result of X-raying of seeds of barley. One line had two separate rings of four chromosomes each.Pollen abortion in plants with one ring ranged in different lines from 14 to 58 per cent, the average being 28.8. The search for a line with rings but no pollen abortion was unsuccessful, however, the number of lines ex-amined was not large.Stocks homozygous for the interchange have been established for 28 of the 34 lines. The use of a tester set of five interchanges in identifying the chromosomes involved in new interchanges is illustrated. The chromosomes have been labeled temporarily by the letters a through g. The testers are a-b, b-d, c-e, e-f, and c-d, the last being needed to identify only certain combinations.Trisomics have been identified in the progeny of plants heterozygous for an interchange, the configuration at meiosis being a chain of 5 chromosomes.The g chromosome carries the large satellite, confirming the result of Hagberg and Tjio.Linkage tests with different interchanges involving only one chromosome in common indicate that the e chromosome carries linkage group IV, f carries group V. b carries group III.Their usefulness in supplementing the genetic linkage markers in tests to locate new genes is illustrated.They will make it possible to test and establish the independence of the 7 linkage groups; to identify each linkage group with its chromosome. Studies which are in progress to determine the breakage points in the chromosomes and in the linkage groups will make them usable for special problems.
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Claims 12
Claim · model-written summary
X-raying barley seeds yielded 34 chromosomal interchanges.
- Taxon
- barley
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Hordeum vulgaree0 - Treatment
- X-rayinge0
- Outcome
- chromosomal interchangese0
- Value
- Thirty-foure0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Thirty-four chromosomal interchanges are reported, the result of X-raying of seeds of barley”
Claim · model-written summary
One barley line had two separate rings of four chromosomes each.
- Taxon
- BarleyHordeum vulgaret0
- Material
- One linee0
- Outcome
- two separate rings of four chromosomes eache0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Barley”
e0“One line had two separate rings of four chromosomes each”
Claim · model-written summary
Pollen abortion in one-ring barley lines ranged from 14 to 58 percent, averaging 28.8.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- Pollen abortione0
- Value
- 14 to 58 per cente0
- Qualifier
- the average being 28.8e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Barley”
e0“Pollen abortion in plants with one ring ranged in different lines from 14 to 58 per cent, the average being 28.8”
Claim · model-written summary
No line with rings and no pollen abortion was found among the limited lines examined.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- line with rings but no pollen abortione0
- Direction
- unsuccessfule0
- Qualifier
- the number of lines ex-amined was not largee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Barley”
e0“The search for a line with rings but no pollen abortion was unsuccessful, however, the number of lines ex-amined was not large”
Claim · model-written summary
Homozygous interchange stocks were established for 28 of 34 barley lines.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- Stocks homozygous for the interchangee0
- Value
- 28 of the 34 linese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Barley”
e0“Stocks homozygous for the interchange have been established for 28 of the 34 lines”
Claim · model-written summary
A five-interchange tester set was demonstrated for identifying chromosomes in new interchanges.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- identifying the chromosomes involved in new interchangese0
- Value
- five interchangese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Barley”
e0“The use of a tester set of five interchanges in identifying the chromosomes involved in new interchanges is illustrated”
Claim · model-written summary
Trisomics occurred among progeny of barley plants heterozygous for an interchange.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- Trisomicse0
- Qualifier
- the configuration at meiosis being a chain of 5 chromosomese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Barley”
e0“Trisomics have been identified in the progeny of plants heterozygous for an interchange, the configuration at meiosis being a chain of 5 chromosomes”
Claim · model-written summary
The barley g chromosome carries the large satellite.
- Taxon
- BarleyHordeum vulgaret0
- Material
- g chromosomee0
- Outcome
- large satellitee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Barley”
e0“The g chromosome carries the large satellite”
Claim · model-written summary
The e chromosome carries linkage group IV.
- Taxon
- BarleyHordeum vulgaret0
- Material
- e chromosomee0
- Outcome
- linkage group IVe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Barley”
e0“the e chromosome carries linkage group IV”
Claim · model-written summary
The f chromosome carries linkage group V.
- Taxon
- BarleyHordeum vulgaret0
- Material
- fe0
- Outcome
- group Ve0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Barley”
e0“f carries group V”
Claim · model-written summary
The b chromosome carries linkage group III.
- Taxon
- BarleyHordeum vulgaret0
- Material
- be0
- Outcome
- group IIIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Barley”
e0“b carries group III”
Claim · model-written summary
Interchanges were shown useful as markers to locate new genes.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- locate new genese0
- Comparator
- genetic linkage markerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Barley”
e0“Their usefulness in supplementing the genetic linkage markers in tests to locate new genes is illustrated”