Abstract
The maintainer lines of wild abortive(WA)cytoplasmic male sterile line mainly come from early indica rice cultivars with the genetic background of Nan-TeHao and AiZi-Zhan and so on in the valley of Changjiang River due to genetic restriction of the relationship between the WA cytoplasm and its restorer line.The high content of amylose and big chalkiness for these cultivars has long restricted the improvement of hybrid rice quality.The study was aimed at improving rice quality high efficiently and rapidly by using a new breeding approach.A male sterile cytoplasm of O.rufipogon,named FA cytoplasm,was obtained through nuclear substitution of the wild rice(O.rufipogon)with the nuclear of cultivated rice by backcrosses.The results showed that the male sterile line with FA cytoplasm was different from WA and HL sterile lines(table 5) in the relationship between restorer line and maintainer line.The restorer and maintainer lines of WA and HL both could be used as the maintainer line of FA cytoplasmic sterile line,but not as its restorer line.It was a newly found resource of rice male sterile cytoplasm.FA cytoplasm was free from the genetic confinement of the relationship between the restorer line and maintainer line of WA and HL,enlarging the circle of maintainer liners so that good cultivated cultivars could be developed into fine male sterile lines.Jinnong 1A,a newly developed male sterile line with FA cytoplasm,had a high degree of stable sterility with superior agronomic traits and good resistance to diseases.It flowered earlier with good rice quality.All the twelve indexes of rice qualities reached the first or second class standards issued by the Ministry of Agriculture,China,which substantially improved the rice quality and comprehensive traits,and established a solid foundation for the development of fine quality hybrid rice.The development of FA cytoplasm and the male sterile line of Jinnong 1A made it possible to open up a new way of breeding high standard of fine quality male sterile lines.It was of great significance to the enriching of genetic diversities of hybrid rice cytoplasm and the increasing of hybrid rice quality and yield by leaps and bounds.
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Claims 10
Claim · model-written summary
A male sterile FA cytoplasm was obtained by nuclear substitution.
- Taxon
- O.rufipogon
Oryza rufipogone0 - Material
- FA cytoplasme0
- Outcome
- male sterile cytoplasme0
- Value
- FA cytoplasme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A male sterile cytoplasm of O.rufipogon,named FA cytoplasm,was obtained through nuclear substitution of the wild rice(O.rufipogon)with the nuclear of cultivated rice by backcrosses”
Claim · model-written summary
FA cytoplasm differed from WA and HL sterile lines in restorer and maintainer relationships.
- Taxon
- Rice
Oryza sativat0 - Material
- FA cytoplasme0
- Outcome
- relationship between restorer line and maintainer linee0
- Direction
- differente0
- Comparator
- WA and HL sterile linese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the male sterile line with FA cytoplasm was different from WA and HL sterile lines(table 5) in the relationship between restorer line and maintainer line”
t0“Rice Sterile Line”
Claim · model-written summary
WA and HL restorer and maintainer lines could maintain FA cytoplasmic sterile lines but could not restore them.
- Taxon
- RiceOryza sativat0
- Material
- FA cytoplasmic sterile linee0
- Outcome
- maintainer linee0
- Qualifier
- but not as its restorer linee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The restorer and maintainer lines of WA and HL both could be used as the maintainer line of FA cytoplasmic sterile line,but not as its restorer line”
t0“Rice Sterile Line”
Claim · model-written summary
FA cytoplasm enlarged the set of possible maintainer lines.
- Taxon
- RiceOryza sativat0
- Material
- FA cytoplasme0
- Outcome
- circle of maintainer linerse0
- Direction
- enlarginge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“FA cytoplasm was free from the genetic confinement of the relationship between the restorer line and maintainer line of WA and HL,enlarging the circle of maintainer liners”
t0“Rice Sterile Line”
Claim · model-written summary
Jinnong 1A showed stable sterility.
- Taxon
- RiceOryza sativat0
- Material
- Jinnong 1Ae0
- Outcome
- stable sterilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Jinnong 1A,a newly developed male sterile line with FA cytoplasm,had a high degree of stable sterility”
t0“Rice Sterile Line”
Claim · model-written summary
Jinnong 1A had superior agronomic traits.
- Taxon
- RiceOryza sativat0
- Material
- Jinnong 1Ae0
- Outcome
- agronomic traitse0
- Direction
- superiore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Jinnong 1A,a newly developed male sterile line with FA cytoplasm,had a high degree of stable sterility with superior agronomic traits and good resistance to diseases”
t0“Rice Sterile Line”
Claim · model-written summary
Jinnong 1A had good disease resistance.
- Taxon
- RiceOryza sativat0
- Material
- Jinnong 1Ae0
- Outcome
- resistance to diseasese0
- Direction
- goode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Jinnong 1A,a newly developed male sterile line with FA cytoplasm,had a high degree of stable sterility with superior agronomic traits and good resistance to diseases”
t0“Rice Sterile Line”
Claim · model-written summary
Jinnong 1A flowered earlier.
- Taxon
- RiceOryza sativat0
- Outcome
- flowerede0
- Direction
- earliere0
Not reportedMaterial
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It flowered earlier with good rice quality”
t0“Rice Sterile Line”
Claim · model-written summary
Jinnong 1A had good rice quality.
- Taxon
- RiceOryza sativat0
- Outcome
- rice qualitye0
- Direction
- goode0
Not reportedMaterial
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It flowered earlier with good rice quality”
t0“Rice Sterile Line”
Claim · model-written summary
All twelve rice quality indexes met first or second class standards.
- Taxon
- riceOryza sativae0
- Outcome
- indexes of rice qualitiese0
- Value
- twelvee0
- Comparator
- first or second class standardse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All the twelve indexes of rice qualities reached the first or second class standards issued by the Ministry of Agriculture,China”