Abstract
Two strains of Hordeum bulbosum (4X), X191 and X487, were reciprocally crossed to a strain of H. vulgare (4X), D8/55, and their hybrid embryos were cytologically examined in order to know time, pattern and genetic control of somatic chromosome elimination occurred in the tetraploid hybrids between these species.Fourty hybrid embryos from each cross were sampled at 6 different times from 3 to 13 days after pollination.In all of the crosses, chromosome elimination occurred very frequently by about 9 days after pollination and a number of dihaploid cells were observed.The maximum rate of chromosome elimination was observed in the period of 3 to 5 days after pollination.It was cleary indicated that degree of chromosome elimination or dihaploid frequencies were quite different between the crosses with X191 and X487 but not different between reciprocals.This strongly suggests that the chromosome elimination is mainly controlled by nuclear gene (s) involved in bulbosum parents, but affected little by cytoplasms of these two species.
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Claims 5
Claim · model-written summary
Chromosome elimination occurred frequently by about 9 days after pollination, with many dihaploid cells.
- Taxon
- Hordeum bulbosum
Hordeum bulbosumt0 - Outcome
- chromosome eliminatione0
- Qualifier
- by about 9 days after pollinatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In all of the crosses, chromosome elimination occurred very frequently by about 9 days after pollination and a number of dihaploid cells were observed.”
t0“Hordeum bulbosum(4X)”
Claim · model-written summary
The maximum chromosome elimination rate was at 3 to 5 days after pollination.
- Taxon
- Hordeum bulbosumHordeum bulbosumt0
- Outcome
- rate of chromosome eliminatione0
- Direction
- maximume0
- Value
- 3 to 5 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maximum rate of chromosome elimination was observed in the period of 3 to 5 days after pollination.”
t0“Hordeum bulbosum(4X)”
Claim · model-written summary
Chromosome elimination and dihaploid frequencies differed between crosses with X191 and X487.
- Taxon
- Hordeum bulbosumHordeum bulbosumt0
- Material
- X191 and X487e0
- Outcome
- degree of chromosome elimination or dihaploid frequenciese0
- Direction
- differente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“degree of chromosome elimination or dihaploid frequencies were quite different between the crosses with X191 and X487”
t0“Hordeum bulbosum(4X)”
Claim · model-written summary
Chromosome elimination and dihaploid frequencies did not differ between reciprocal crosses.
- Taxon
- Hordeum bulbosumHordeum bulbosumt0
- Outcome
- chromosome elimination or dihaploid frequenciese1
- Direction
- not differente0
- Comparator
- reciprocalse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but not different between reciprocals”
t0“Hordeum bulbosum(4X)”
e1“degree of chromosome elimination or dihaploid frequencies”
Claim · model-written summary
The authors infer control mainly by bulbosum nuclear genes with little cytoplasmic effect.
- Taxon
- Hordeum bulbosumHordeum bulbosumt0
- Gene
- nuclear gene (s)e0
- Outcome
- chromosome eliminatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chromosome elimination is mainly controlled by nuclear gene (s) involved in bulbosum parents, but affected little by cytoplasms of these two species.”
t0“Hordeum bulbosum(4X)”