Abstract
Heterosis is the superior performance of F1 hybrids compared with their homozygous, genetically distinct parents. In this study, we monitored the transcriptomic divergence of the maize (Zea mays) inbred lines B73 and Mo17 and their reciprocal F1 hybrid progeny in primary roots under control and water deficit conditions simulated by polyethylene glycol treatment. Single-parent expression (SPE) of genes is an extreme instance of gene expression complementation, in which genes are active in only one of two parents but are expressed in both reciprocal hybrids. In this study, 1,997 genes only expressed in B73 and 2,024 genes only expressed in Mo17 displayed SPE complementation under control and water deficit conditions. As a consequence, the number of active genes in hybrids exceeded the number of active genes in the parental inbred lines significantly independent of treatment. SPE patterns were substantially more stable to expression changes by water deficit treatment than other genotype-specific expression profiles. While, on average, 75% of all SPE patterns were not altered in response to polyethylene glycol treatment, only 17% of the remaining genotype-specific expression patterns were not changed by water deficit. Nonsyntenic genes that lack syntenic orthologs in other grass species, and thus evolved late in the grass lineage, were significantly overrepresented among SPE genes. Hence, the significant overrepresentation of nonsyntenic genes among SPE patterns and their stability under water limitation might suggest a function of these genes during the early developmental manifestation of heterosis under fluctuating environmental conditions in hybrid progeny of the inbred lines B73 and Mo17.
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Claims 8
Claim · model-written summary
Under control and water deficit conditions, 1,997 B73-only genes showed single-parent expression complementation.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In this study, 1,997 genes only expressed in B73 and 2,024 genes only expressed in Mo17 displayed SPE complementation under control and water deficit conditions.”
t0“Maize”
Claim · model-written summary
Under control and water deficit conditions, 2,024 Mo17-only genes showed single-parent expression complementation.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In this study, 1,997 genes only expressed in B73 and 2,024 genes only expressed in Mo17 displayed SPE complementation under control and water deficit conditions.”
t0“Maize”
Claim · model-written summary
Hybrids had significantly more active genes than parental inbreds irrespective of treatment.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As a consequence, the number of active genes in hybrids exceeded the number of active genes in the parental inbred lines significantly independent of treatment.”
t0“Maize”
Claim · model-written summary
Single-parent expression patterns were more stable under water deficit than other genotype-specific expression profiles.
- Treatment
- water deficit treatmente0
- Outcome
- SPE patternse0
- Direction
- more stablee0
- Comparator
- other genotype-specific expression profilese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SPE patterns were substantially more stable to expression changes by water deficit treatment than other genotype-specific expression profiles.”
t0“Maize”
Claim · model-written summary
Seventy-five percent of single-parent expression patterns were unchanged by polyethylene glycol treatment.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“While, on average, 75% of all SPE patterns were not altered in response to polyethylene glycol treatment, only 17% of the remaining genotype-specific expression patterns were not changed by water deficit.”
t0“Maize”
Claim · model-written summary
Only 17% of remaining genotype-specific expression patterns were unchanged by water deficit.
- Treatment
- water deficite0
- Outcome
- remaining genotype-specific expression patternse0
- Direction
- not changede0
- Value
- 17%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“While, on average, 75% of all SPE patterns were not altered in response to polyethylene glycol treatment, only 17% of the remaining genotype-specific expression patterns were not changed by water deficit.”
t0“Maize”
Claim · model-written summary
Nonsyntenic genes were significantly overrepresented among single-parent expression genes.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nonsyntenic genes that lack syntenic orthologs in other grass species, and thus evolved late in the grass lineage, were significantly overrepresented among SPE genes.”
t0“Maize”
Claim · model-written summary
The authors suggested stable nonsyntenic genes may contribute to early heterosis under changing environments.
- Gene
- nonsyntenic genese0
- Outcome
- early developmental manifestation of heterosise0
- Qualifier
- under fluctuating environmental conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hence, the significant overrepresentation of nonsyntenic genes among SPE patterns and their stability under water limitation might suggest a function of these genes during the early developmental manifestation of heterosis under fluctuating environmental conditions in hybrid progeny of the inbred lines B73 and Mo17.”
t0“Maize”
The same questions in other papers
poly(ethylene glycol) · molecular: expression · Zea mays (maize)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
1 paper more in this group
See all 5 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.