Abstract
Nitrogen (N)-fixing soybean plants use the ureides allantoin and allantoic acid as major long-distance transport forms of N, but in non-fixing, non-nodulated plants amino acids mainly serve in source-to-sink N allocation. However, some ureides are still synthesized in roots of non-fixing soybean, and our study addresses the role of ureide transport processes in those plants. In previous work, legume ureide permeases (UPSs) were identified that are involved in cellular import of allantoin and allantoic acid. Here, UPS1 from common bean was expressed in the soybean phloem, which resulted in enhanced source-to-sink transport of ureides in the transgenic plants. This was accompanied by increased ureide synthesis and elevated allantoin and allantoic acid root-to-sink transport. Interestingly, amino acid assimilation, xylem transport, and phloem partitioning to sinks were also strongly up-regulated. In addition, photosynthesis and sucrose phloem transport were improved in the transgenic plants. These combined changes in source physiology and assimilate partitioning resulted in increased vegetative growth and improved seed numbers. Overall, the results support that ureide transport processes in non-fixing plants affect source N and carbon acquisition and assimilation as well as source-to-sink translocation of N and carbon assimilates with consequences for plant growth and seed development.
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Claims 7
Claim · model-written summary
Phloem expression of common bean UPS1 enhanced ureide source-to-sink transport in soybean.
- Taxon
- soybean
Glycine maxe0 - Treatment
- UPS1 from common bean was expressed in the soybean phloeme0
- Gene
- UPS1e0
- Outcome
- source-to-sink transport of ureidese0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UPS1 from common bean was expressed in the soybean phloem, which resulted in enhanced source-to-sink transport of ureides in the transgenic plants”
Claim · model-written summary
UPS1-expressing soybean had increased ureide synthesis.
- Taxon
- soybeanGlycine maxt0
- Gene
- UPS1e1
- Outcome
- ureide synthesise0
- Direction
- increasede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“This was accompanied by increased ureide synthesis”
e1“UPS1 from common bean was expressed in the soybean phloem, which resulted in enhanced source-to-sink transport of ureides in the transgenic plants”
Claim · model-written summary
UPS1-expressing soybean had elevated allantoin and allantoic acid root-to-sink transport.
- Taxon
- soybeanGlycine maxt0
- Outcome
- allantoin and allantoic acid root-to-sink transporte0
- Direction
- elevatede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“elevated allantoin and allantoic acid root-to-sink transport”
Claim · model-written summary
Amino acid assimilation, xylem transport, and phloem partitioning to sinks were strongly up-regulated in transgenic soybean.
- Taxon
- soybeanGlycine maxt0
- Outcome
- amino acid assimilation, xylem transport, and phloem partitioning to sinkse0
- Direction
- up-regulatede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“amino acid assimilation, xylem transport, and phloem partitioning to sinks were also strongly up-regulated”
Claim · model-written summary
Photosynthesis and sucrose phloem transport improved in transgenic soybean.
- Taxon
- soybeanGlycine maxt0
- Outcome
- photosynthesis and sucrose phloem transporte0
- Direction
- improvede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“photosynthesis and sucrose phloem transport were improved in the transgenic plants”
Claim · model-written summary
Vegetative growth increased in transgenic soybean.
- Taxon
- soybeanGlycine maxt0
- Outcome
- vegetative growthe0
- Direction
- increasede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“increased vegetative growth and improved seed numbers”
Claim · model-written summary
Seed numbers improved in transgenic soybean.
- Taxon
- soybeanGlycine maxt0
- Outcome
- seed numberse0
- Direction
- improvede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“increased vegetative growth and improved seed numbers”