Abstract
Heritable changes of phenotype arising in plant ontogenesis by the influence of environmental factors belong to the most intriguing genetic phenomena. An unusual inheritance pattern was detected during examination of male fertility restoration in the CMS-inducing "9E" type cytoplasm of sorghum: Rf-genes were functional in self-pollinated progeny of F(1) hybrids yet were either not expressed or poorly expressed in backcrosses of these hybrids to CMS-lines with the same cytoplasm type. In experiments on parallel growing of the same F(1) hybrid combinations in the "dry plot" and in the "irrigated plot," it was found that high level of plant water availability during panicle and pollen developmental stages significantly increased male fertility of F(1) and test-cross hybrid populations, in which fertility-restoring genes were in heterozygote state, whereas in F(2) populations the influences of water availability conditions cause less pronounce effects. Similarly, male-sterile F(1) plants, being transferred from the "dry plot" to greenhouse, produced male-fertile panicles. In addition, male-sterile plants from F(2) families, which segregated-out as recessives, being transferred to greenhouse also produced male-fertile panicles. In the progenies of these revertants that were grown in field conditions and in the "dry plot," stable inheritance of male fertility for three cycles of self-pollination was observed, and a number of stable fertile lines in the "9E" cytoplasm were obtained. However, in test-crosses of these fertile lines to CMS-lines with the "9E" cytoplasm restoration of male fertility was not observed, except the progeny of one revertant that behaved as fertility-restorer line. These data suggest that the functional state of fertility-restoring genes for the "9E" sorghum cytoplasm is epigenetically regulated trait established by the influence of environmental factors and is transmitted to sexual generations.
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Claims 10
Claim · model-written summary
Restoring genes functioned in self-pollinated F1 progeny but were poorly expressed or unexpressed in backcrosses.
- Gene
- Rf-genese0
- Outcome
- Rf-genes were functional in self-pollinated progeny of F(1) hybrids yet were either not expressed or poorly expressed in backcrossese0
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rf-genes were functional in self-pollinated progeny of F(1) hybrids yet were either not expressed or poorly expressed in backcrosses of these hybrids to CMS-lines with the same cytoplasm type”
t0“of Sorghum”
Claim · model-written summary
High water availability significantly increased male fertility of heterozygous F1 and test-cross hybrids.
- Organ / stage
- panicle and pollen developmental stagese0
- Treatment
- high level of plant water availabilitye0
- Gene
- fertility-restoring genese0
- Outcome
- male fertilitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high level of plant water availability during panicle and pollen developmental stages significantly increased male fertility of F(1) and test-cross hybrid populations, in which fertility-restoring genes were in heterozygote state”
t0“of Sorghum”
Claim · model-written summary
Water availability had a less pronounced effect on male fertility in F2 populations.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whereas in F(2) populations the influences of water availability conditions cause less pronounce effects”
t0“of Sorghum”
Claim · model-written summary
Male-sterile F1 plants transferred from dry plots to a greenhouse produced male-fertile panicles.
- Organ / stage
- paniclese0
- Treatment
- transferred from the "dry plot" to greenhousee0
- Outcome
- produced male-fertile paniclese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“male-sterile F(1) plants, being transferred from the "dry plot" to greenhouse, produced male-fertile panicles”
t0“of Sorghum”
Claim · model-written summary
Recessive male-sterile F2 plants transferred to a greenhouse produced male-fertile panicles.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“male-sterile plants from F(2) families, which segregated-out as recessives, being transferred to greenhouse also produced male-fertile panicles”
t0“of Sorghum”
Claim · model-written summary
Revertant progeny retained male fertility through three self-pollination cycles.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stable inheritance of male fertility for three cycles of self-pollination was observed”
t0“of Sorghum”
Claim · model-written summary
Stable fertile lines in 9E cytoplasm were obtained.
- Outcome
- stable fertile lines in the "9E" cytoplasm were obtainede0
- Value
- a number of stable fertile linese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a number of stable fertile lines in the "9E" cytoplasm were obtained”
t0“of Sorghum”
Claim · model-written summary
Most fertile lines did not restore fertility when crossed with CMS lines.
- Outcome
- restoration of male fertility was not observede0
- Qualifier
- except the progeny of one revertant that behaved as fertility-restorer linee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in test-crosses of these fertile lines to CMS-lines with the "9E" cytoplasm restoration of male fertility was not observed, except the progeny of one revertant that behaved as fertility-restorer line”
t0“of Sorghum”
Claim · model-written summary
One revertant progeny behaved as a fertility-restorer line.
- Outcome
- behaved as fertility-restorer linee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the progeny of one revertant that behaved as fertility-restorer line”
t0“of Sorghum”
Claim · model-written summary
Authors infer that environmental conditions epigenetically regulate fertility-restoring genes and pass their functional state to sexual generations.
- Gene
- fertility-restoring genese0
- Outcome
- functional state of fertility-restoring genese0
- Qualifier
- epigenetically regulated trait established by the influence of environmental factors and is transmitted to sexual generationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the functional state of fertility-restoring genes for the "9E" sorghum cytoplasm is epigenetically regulated trait established by the influence of environmental factors and is transmitted to sexual generations”
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See all 11 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.