Abstract
SUMMARYGamma rays emitted by radioactive particles of Co60″, are highly mutagenic. It can not only induce gene mutation but also act as a powerful agent in chromosome and chromatid breakage. A balery plant with 53% pollen and 71% ovule sterility was obtained in the progeny grown from seeds irradiated with 15,000r. Subsequently, this plant produced fewer mature seeds. Meiotic analysis of the microsporocytes collected from this plant showed two isochromosomes, more frequently associated with a ring of four chromosomes than without it. Cytological study of the somatic metaphase, prepared from leaf sheath meristems of the same heterozygous plant revealed a few centromeric breaks adding support to the occurrence of isochromosomes.A chromatid break detected in the same leaf sheath mitosis lent support to the occurrence of deficiency of a small chromosome arm, observed at late diplotene. In the progeny of this plant, two mutant forms were obtained. The liguleless-auricleless mutant has inherited as a single recessive trait; and the grass like mutant is suspected to be due to the deficiency.
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Claims 9
Claim · model-written summary
Barley plant progeny of irradiated seeds showed 53% pollen sterility.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- seeds irradiated with 15,000re0
- Outcome
- pollene0
- Value
- 53%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“Deficiency Mutation in Barley”
e0“A balery plant with 53% pollen and 71% ovule sterility was obtained in the progeny grown from seeds irradiated with 15,000r”
Claim · model-written summary
Barley plant progeny of irradiated seeds showed 71% ovule sterility.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- seeds irradiated with 15,000re0
- Outcome
- ovulee0
- Value
- 71%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Deficiency Mutation in Barley”
e0“A balery plant with 53% pollen and 71% ovule sterility was obtained in the progeny grown from seeds irradiated with 15,000r”
Claim · model-written summary
The barley plant with sterility produced fewer mature seeds.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- mature seedse1
- Qualifier
- fewere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Deficiency Mutation in Barley”
e1“Subsequently, this plant produced fewer mature seeds”
Claim · model-written summary
Meiosis of the barley plant showed two isochromosomes, more often associated with a ring of four chromosomes.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- microsporocytese2
- Outcome
- isochromosomese2
- Value
- twoe2
- Qualifier
- more frequently associated with a ring of four chromosomes than without ite2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Deficiency Mutation in Barley”
e2“Meiotic analysis of the microsporocytes collected from this plant showed two isochromosomes, more frequently associated with a ring of four chromosomes than without it”
Claim · model-written summary
Somatic metaphase in leaf sheath meristems of the barley plant showed a few centromeric breaks.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- leaf sheath meristemse3
- Outcome
- centromeric breakse3
- Qualifier
- a fewe3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Deficiency Mutation in Barley”
e3“Cytological study of the somatic metaphase, prepared from leaf sheath meristems of the same heterozygous plant revealed a few centromeric breaks adding support to the occurrence of isochromosomes”
Claim · model-written summary
A chromatid break in leaf sheath mitosis lent support to a deficiency of a small chromosome arm.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- leaf sheath mitosise4
- Outcome
- chromatid breake4
- Qualifier
- lent support to the occurrence of deficiency of a small chromosome arme4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Deficiency Mutation in Barley”
e4“A chromatid break detected in the same leaf sheath mitosis lent support to the occurrence of deficiency of a small chromosome arm, observed at late diplotene”
Claim · model-written summary
A deficiency of a small chromosome arm was observed at late diplotene.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- late diplotenee4
- Outcome
- deficiency of a small chromosome arme4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Deficiency Mutation in Barley”
e4“A chromatid break detected in the same leaf sheath mitosis lent support to the occurrence of deficiency of a small chromosome arm, observed at late diplotene”
Claim · model-written summary
The liguleless-auricleless mutant was inherited as a single recessive trait.
- Taxon
- barleyHordeum vulgaret0
- Material
- liguleless-auricleless mutante5
- Outcome
- inheritede5
- Qualifier
- as a single recessive traite5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Deficiency Mutation in Barley”
e5“The liguleless-auricleless mutant has inherited as a single recessive trait”
Claim · model-written summary
The grass-like mutant is suspected to be due to the deficiency.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- grass like mutante6
- Qualifier
- suspected to be due to the deficiencye6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Deficiency Mutation in Barley”
e6“the grass like mutant is suspected to be due to the deficiency”