Abstract
Low phosphorus (P) stress impacts nitrogen (N) metabolism in soybeans. This study investigated the effects of exogenous cytokinin (Trans-Zeatin) on soybean N metabolism under low P stress by treating seeds with Trans-Zeatin and analyzing N accumulation, 15N abundance, nodule N fixation accumulation, nodule N fixation rate, nodule nitrogenase activity, soluble protein content, and free amino acid profiles. The results showed that exogenous cytokinin enhanced N accumulation in aboveground tissues, roots, and nodules, as well as nodule N fixation accumulation and fixation rate (from day 35 onward) under low P stress. Additionally, it promoted both acetylene reduction activity (ARA) and specific nitrogenase activity (SNA) in soybean nodules. By increasing the absorption of fertilizer-derived N, exogenous cytokinin alleviated the inhibitory effects of low P stress on the early growth and development of soybeans. Notably, under low P conditions, exogenous cytokinin significantly elevated the soluble protein content in nodules. However, the underlying mechanisms governing changes in free amino acid profiles require further investigation. This study provides a theoretical foundation for developing strategies to regulate soybean N metabolism under low P stress.
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Claims 8
Claim · model-written summary
Exogenous cytokinin enhanced nitrogen accumulation in aboveground tissues.
- Taxon
- soybeans
Glycine maxe2 - Treatment
- exogenous cytokinine0
- Outcome
- N accumulation in aboveground tissuese0
- Direction
- enhancede0
- Qualifier
- under low P stresse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous cytokinin enhanced N accumulation in aboveground tissues, roots, and nodules”
e1“from day 35 onward) under low P stress”
e2“early growth and development of soybeans”
Claim · model-written summary
Exogenous cytokinin enhanced nitrogen accumulation in roots.
- Taxon
- soybeansGlycine maxe2
- Organ / stage
- rootse0
- Treatment
- exogenous cytokinine0
- Outcome
- N accumulatione0
- Direction
- enhancede0
- Qualifier
- under low P stresse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous cytokinin enhanced N accumulation in aboveground tissues, roots, and nodules”
e1“from day 35 onward) under low P stress”
e2“early growth and development of soybeans”
Claim · model-written summary
Exogenous cytokinin enhanced nitrogen accumulation in nodules.
- Taxon
- soybeansGlycine maxe2
- Organ / stage
- nodulese0
- Treatment
- exogenous cytokinine0
- Outcome
- N accumulatione0
- Direction
- enhancede0
- Qualifier
- under low P stresse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous cytokinin enhanced N accumulation in aboveground tissues, roots, and nodules”
e1“from day 35 onward) under low P stress”
e2“early growth and development of soybeans”
Claim · model-written summary
Exogenous cytokinin enhanced nodule nitrogen fixation accumulation.
- Taxon
- soybeansGlycine maxe1
- Treatment
- exogenous cytokinine0
- Outcome
- nodule N fixation accumulatione0
- Direction
- enhancede0
- Qualifier
- under low P stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous cytokinin enhanced N accumulation in aboveground tissues, roots, and nodules, as well as nodule N fixation accumulation and fixation rate (from day 35 onward) under low P stress”
e1“early growth and development of soybeans”
Claim · model-written summary
Exogenous cytokinin enhanced nodule nitrogen fixation rate from day 35 onward.
- Taxon
- soybeansGlycine maxe1
- Treatment
- exogenous cytokinine0
- Outcome
- fixation ratee0
- Direction
- enhancede0
- Qualifier
- from day 35 onwarde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous cytokinin enhanced N accumulation in aboveground tissues, roots, and nodules, as well as nodule N fixation accumulation and fixation rate (from day 35 onward) under low P stress”
e1“early growth and development of soybeans”
Claim · model-written summary
Exogenous cytokinin increased uptake of fertilizer-derived nitrogen.
- Taxon
- soybeansGlycine maxe0
- Treatment
- exogenous cytokinine0
- Outcome
- absorption of fertilizer-derived Ne0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“By increasing the absorption of fertilizer-derived N, exogenous cytokinin alleviated the inhibitory effects of low P stress on the early growth and development of soybeans”
Claim · model-written summary
Exogenous cytokinin alleviated low-phosphorus inhibition of early soybean growth and development.
- Taxon
- soybeansGlycine maxe0
- Treatment
- exogenous cytokinine0
- Outcome
- early growth and developmente0
- Direction
- alleviatede0
- Qualifier
- low P stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous cytokinin alleviated the inhibitory effects of low P stress on the early growth and development of soybeans”
Claim · model-written summary
Exogenous cytokinin significantly elevated soluble protein content in nodules under low phosphorus.
- Taxon
- soybeansGlycine maxe1
- Organ / stage
- nodulese0
- Treatment
- exogenous cytokinine0
- Outcome
- soluble protein contente0
- Direction
- elevatede0
- Qualifier
- under low P conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under low P conditions, exogenous cytokinin significantly elevated the soluble protein content in nodules”
e1“early growth and development of soybeans”
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