Abstract
Autopolyploids often show growth advantages over their diploid progenitors because of their increased photosynthetic activity; however, the underlying molecular basis of such mechanism remains elusive. In this study, we aimed to characterize autotetraploid pak choi (Brassica rapa ssp. chinensis) at the physiological, cellular and molecular levels. Autotetraploid pak choi has thicker leaves than its diploid counterparts, with relatively larger intercellular spaces and cell size and greater grana thylakoid height. Photosynthetic data showed that the relative electron transport rate (rETR) was markedly higher in autotetraploid than in diploid pak choi. Transcriptomic data revealed that the expressions of genes involved in 'photosynthesis' biological process and 'thylakoids' cellular component were mainly regulated in autotetraploids. Overall, our findings suggested that the increased rETR in the thylakoids contributed to the increased photosynthetic capacity of autotetraploid leaves. Furthermore, we found that the enhanced rETR is associated with increased BrPetC expression, which is likely altered by histone modification. The ectopic expression of BrPetC in Arabidopsis thaliana led to increased rETR and biomass, which were decreased in BrPetC-silenced pak choi. Autotetraploid pak choi also shows altered hormone levels, which was likely responsible for the increased drought resistance and the impaired powdery mildew resistance of this lineage. Our findings further our understanding on how autotetraploidy provides growth advantages to plants.
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Claims 11
Claim · model-written summary
Autotetraploid pak choi has thicker leaves than diploid pak choi.
Verbatim
e1“Autotetraploid pak choi has thicker leaves than its diploid counterparts, with relatively larger intercellular spaces and cell size and greater grana thylakoid height”
Claim · model-written summary
The relative electron transport rate (rETR) was higher in autotetraploid than in diploid pak choi.
Verbatim
e2“Photosynthetic data showed that the relative electron transport rate (rETR) was markedly higher in autotetraploid than in diploid pak choi”
Claim · model-written summary
Genes in the photosynthesis process and thylakoid component were mainly regulated in autotetraploids.
Verbatim
e1“Autotetraploid pak choi has thicker leaves than its diploid counterparts, with relatively larger intercellular spaces and cell size and greater grana thylakoid height”
e3“Transcriptomic data revealed that the expressions of genes involved in 'photosynthesis' biological process and 'thylakoids' cellular component were mainly regulated in autotetraploids”
Claim · model-written summary
The increased rETR in the thylakoids is suggested to contribute to the increased photosynthetic capacity of autotetraploid leaves.
Verbatim
e4“Overall, our findings suggested that the increased rETR in the thylakoids contributed to the increased photosynthetic capacity of autotetraploid leaves”
e1“Autotetraploid pak choi has thicker leaves than its diploid counterparts, with relatively larger intercellular spaces and cell size and greater grana thylakoid height”
Claim · model-written summary
The enhanced rETR is associated with increased BrPetC expression in pak choi.
Verbatim
e5“we found that the enhanced rETR is associated with increased BrPetC expression, which is likely altered by histone modification”
e6“The ectopic expression of BrPetC in Arabidopsis thaliana led to increased rETR and biomass, which were decreased in BrPetC-silenced pak choi”
Claim · model-written summary
BrPetC expression is likely altered by histone modification.
Verbatim
e5“we found that the enhanced rETR is associated with increased BrPetC expression, which is likely altered by histone modification”
e6“The ectopic expression of BrPetC in Arabidopsis thaliana led to increased rETR and biomass, which were decreased in BrPetC-silenced pak choi”
Claim · model-written summary
Ectopic expression of BrPetC in Arabidopsis thaliana increased rETR and biomass.
- Taxon
- Arabidopsis thaliana
Arabidopsis thalianae6 - Treatment
- ectopic expression of BrPetCe6
- Gene
- BrPetCe6
- Outcome
- rETR and biomasse6
- Direction
- increasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“The ectopic expression of BrPetC in Arabidopsis thaliana led to increased rETR and biomass, which were decreased in BrPetC-silenced pak choi”
Claim · model-written summary
BrPetC-silenced pak choi showed decreased rETR and biomass.
Not reportedComparator
Verbatim
e6“The ectopic expression of BrPetC in Arabidopsis thaliana led to increased rETR and biomass, which were decreased in BrPetC-silenced pak choi”
Claim · model-written summary
Autotetraploid pak choi shows altered hormone levels.
Verbatim
e7“Autotetraploid pak choi also shows altered hormone levels, which was likely responsible for the increased drought resistance and the impaired powdery mildew resistance of this lineage”
Claim · model-written summary
Altered hormone levels are likely responsible for the increased drought resistance of autotetraploid pak choi.
Verbatim
e7“Autotetraploid pak choi also shows altered hormone levels, which was likely responsible for the increased drought resistance and the impaired powdery mildew resistance of this lineage”
Claim · model-written summary
Altered hormone levels are likely responsible for the impaired powdery mildew resistance of autotetraploid pak choi.
Verbatim
e7“Autotetraploid pak choi also shows altered hormone levels, which was likely responsible for the increased drought resistance and the impaired powdery mildew resistance of this lineage”
The same questions in other papers
overexpression · physiology: photosynthesis · Arabidopsis thaliana (thale cress)Positive and negative results
1 in the opposite direction
- 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.