Abstract
Rice (Oryza sativa L.) seedlings grown under nitrogen (N) deficiency conditions show a foraging response characterized by increased root length. However, the mechanism underlying this developmental plasticity is still poorly understood. In this study, the mechanism by which N deficiency influences rice seminal root growth was investigated. The results demonstrated that compared with the control (1 mM N) treatment, N deficiency treatments strongly promoted seminal root growth. However, the N deficiency-induced growth was negated by the application of zeatin, which is a type of cytokinin (CK). Moreover, the promotion of rice seminal root growth was correlated with a decrease in CK content, which was due to the N deficiency-mediated inhibition of CK biosynthesis through the down-regulation of CK biosynthesis genes and an enhancement of CK degradation through the up-regulation of CK degradation genes. In addition, the N deficiency-induced decrease in CK content not only enhanced the root meristem cell proliferation rate by increasing the meristem cell number via the down-regulation of OsIAA3 and up-regulation of root-expressed OsPLTs, but also promoted root cell elongation by up-regulating cell elongation-related genes, including root-specific OsXTHs and OsEXPs. Taken together, our data suggest that an N deficiency-induced decrease in CK content promotes the seminal root growth of rice seedlings by promoting root meristem cell proliferation and cell elongation.
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Claims 6
Claim · model-written summary
Nitrogen deficiency promoted rice seminal root growth relative to the 1 mM N control.
- Taxon
- Rice
Oryza sativat0 - Treatment
- N deficiency treatmentse0
- Outcome
- seminal root growthe0
- Direction
- promotede0
- Qualifier
- 1 mM Ne0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results demonstrated that compared with the control (1 mM N) treatment, N deficiency treatments strongly promoted seminal root growth.”
t0“Rice”
Claim · model-written summary
Zeatin application negated nitrogen-deficiency-induced rice root growth.
- Taxon
- RiceOryza sativat0
- Treatment
- application of zeatine0
- Outcome
- growthe0
- Direction
- negatede0
- Qualifier
- N deficiency-inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, the N deficiency-induced growth was negated by the application of zeatin, which is a type of cytokinin (CK).”
t0“Rice”
Claim · model-written summary
Promotion of rice seminal root growth correlated with decreased cytokinin content.
- Taxon
- riceOryza sativae0
- Compound
- CKe0
- Outcome
- seminal root growthe0
- Direction
- promotione0
- Qualifier
- a decrease in CK contente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moreover, the promotion of rice seminal root growth was correlated with a decrease in CK content”
Claim · model-written summary
Nitrogen deficiency reduced cytokinin content through inhibited biosynthesis and enhanced degradation with corresponding gene regulation.
- Taxon
- RiceOryza sativat0
- Treatment
- N deficiencye0
- Outcome
- CK contente0
- Direction
- decreasee0
- Qualifier
- inhibition of CK biosynthesis through the down-regulation of CK biosynthesis genes and an enhancement of CK degradation through the up-regulation of CK degradation genese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a decrease in CK content, which was due to the N deficiency-mediated inhibition of CK biosynthesis through the down-regulation of CK biosynthesis genes and an enhancement of CK degradation through the up-regulation of CK degradation genes.”
t0“Rice”
Claim · model-written summary
Decreased cytokinin enhanced rice root meristem cell proliferation by increasing meristem cell number through OsIAA3 downregulation and OsPLTs upregulation.
- Taxon
- RiceOryza sativat0
- Gene
- OsIAA3e0
- Compound
- CKe0
- Outcome
- root meristem cell proliferation ratee0
- Direction
- enhancede0
- Qualifier
- increasing the meristem cell number via the down-regulation of OsIAA3 and up-regulation of root-expressed OsPLTse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the N deficiency-induced decrease in CK content not only enhanced the root meristem cell proliferation rate by increasing the meristem cell number via the down-regulation of OsIAA3 and up-regulation of root-expressed OsPLTs”
t0“Rice”
Claim · model-written summary
Decreased cytokinin promoted rice root cell elongation through upregulation of elongation genes including OsXTHs and OsEXPs.
- Taxon
- RiceOryza sativat0
- Gene
- OsXTHs and OsEXPse0
- Compound
- CKe1
- Outcome
- root cell elongatione0
- Direction
- promotede0
- Qualifier
- up-regulating cell elongation-related genese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but also promoted root cell elongation by up-regulating cell elongation-related genes, including root-specific OsXTHs and OsEXPs.”
e1“the N deficiency-induced decrease in CK content”
t0“Rice”
The same questions in other papers
zeatin · growth · Oryza sativa (rice)Positive and negative results
3 in the opposite direction
- positive
- positive
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nitrogen · growth · Oryza sativa (rice)Positive and negative results
108 papers in the same direction as this paper · 402 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
- positive
- positive
507 papers more in this group
See all 511 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.