Abstract
BACKGROUND: Grain weight (GW) is a key component of sunflower yield and quality, but may be limited by maternal tissues. Cell growth is influenced by expansin proteins that loosen the plant cell wall. This study aimed to identify spatio-temporal expression of EXPN genes in sunflower reproductive organ tissues (ovary, pericarp, and embryo) and evaluate correlations between reproductive organ growth and expansin genes expression. Evaluations involved eight different developmental stages, two genotypes, two source-sink treatments and two experiments. The genotypes evaluated are contrasting in GW (Alybro and confection variety RHA280) under two source-sink treatments (control and shaded) to study the interactions between grain growth and expansin genes expression. RESULTS: Ovaries and grains were sampled at pre- and post-anthesis, respectively. Final GW differed between genotypes and shading treatments. Shading treatment decreased final GW by 16.4 and 19.5% in RHA280 and Alybro, respectively. Relative expression of eight expansin genes were evaluated in grain tissues. EXPN4 was the most abundant expansin in the ovary tissue, while EXPN10 and EXPN7 act predominantly in ovary and pericarp tissues, and EXPN1 and EXPN15 in the embryo tissues. CONCLUSIONS: Specific expansin genes were expressed in ovary, pericarp and embryo in a tissue-specific manner. Differential expression among grain tissues was consistent between genotypes, source-sink treatments and experiments. The correlation analysis suggests that EXPN genes could be specifically involved in grain tissue extension, and their expression could be linked to grain size in sunflower.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 7
Claim · model-written summary
Shading reduced final grain weight by 16.4% in RHA280.
- Taxon
- sunflower
Helianthus annuust0 - Material
- RHA280e0
- Treatment
- Shading treatmente0
- Outcome
- final GWe0
- Direction
- decreasede0
- Value
- 16.4e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shading treatment decreased final GW by 16.4 and 19.5% in RHA280 and Alybro, respectively.”
t0“sunflower”
Claim · model-written summary
Shading reduced final grain weight by 19.5% in Alybro.
- Taxon
- sunflowerHelianthus annuust0
- Material
- Alybroe0
- Treatment
- Shading treatmente0
- Outcome
- final GWe0
- Direction
- decreasede0
- Value
- 19.5%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shading treatment decreased final GW by 16.4 and 19.5% in RHA280 and Alybro, respectively.”
t0“sunflower”
Claim · model-written summary
EXPN4 was the most abundant expansin in ovary tissue.
- Taxon
- sunflowerHelianthus annuust0
- Organ / stage
- ovary tissuee0
- Gene
- EXPN4e0
- Outcome
- most abundant expansine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“EXPN4 was the most abundant expansin in the ovary tissue”
t0“sunflower”
Claim · model-written summary
EXPN10 and EXPN7 were expressed predominantly in ovary and pericarp tissues.
- Taxon
- sunflowerHelianthus annuust0
- Organ / stage
- ovary and pericarp tissuese0
- Gene
- EXPN10 and EXPN7e0
- Outcome
- act predominantlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“EXPN10 and EXPN7 act predominantly in ovary and pericarp tissues”
t0“sunflower”
Claim · model-written summary
EXPN1 and EXPN15 were expressed predominantly in embryo tissue.
- Taxon
- sunflowerHelianthus annuust0
- Organ / stage
- embryo tissuese0
- Gene
- EXPN1 and EXPN15e0
- Outcome
- EXPN1 and EXPN15 in the embryo tissuese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“EXPN1 and EXPN15 in the embryo tissues”
t0“sunflower”
Claim · model-written summary
Differential expansin expression among grain tissues was consistent across genotypes, source-sink treatments and experiments.
- Taxon
- sunflowerHelianthus annuust0
- Organ / stage
- grain tissuese0
- Outcome
- Differential expression among grain tissuese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differential expression among grain tissues was consistent between genotypes, source-sink treatments and experiments.”
t0“sunflower”
Claim · model-written summary
Expansin expression may be linked to sunflower grain size and tissue extension.
- Taxon
- sunflowerHelianthus annuust0
- Gene
- EXPN genese0
- Outcome
- grain sizee0
- Qualifier
- could be linkede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The correlation analysis suggests that EXPN genes could be specifically involved in grain tissue extension, and their expression could be linked to grain size in sunflower.”
t0“sunflower”
The same questions in other papers
shade · yield · Helianthus annuus (common sunflower)Results agree
2 papers in the same direction as this paper
- negative
- negative
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.