Abstract
The objective of this research was to investigate the relationship between rice roots negative phototropism and endogenous plant hormone levels, as well as the impact of exogenous hormones on rice root growth. The adventitious roots and primary roots of conventional cultivars Yangdao 6(indica), Nipponbare(japonica), Zhonghua 11(japonica) and its OsPIN1 a over expressed transgenic seedlings were used to observe the process of root negative phototropism, measure contents of endogenous auxin(IAA), gibberellin(GA3) and abscisic acid(ABA) in the bending part of root tips, and investigate the impact of exogenous hormones to rice root morphology and anatomy. Results indicated that seedling roots of both Yangdao 6 and Nipponbare had negative phototropism, and the lateral roots and adventitious roots of Yangdao 6 showed stronger negative phototropism. Plant hormones and negative phototropism of rice root and root development are closely linked. Under unilateral illumination, endogenous IAA, GA3 and ABA levels declined. The content of these phytohormones in the irradiated side was lower than that in the shaded side. The treatment of unilateral light and exogenous IAA induced a large number of root hairs in Yangdao 6. Compared with conventional rice, the angle of negative phototropism was lager in OsPIN1 a transgenic plant. There was no direct relationship between exogenous GA3 and ABA treatments and root negative phototropism of rice. Exogenous ABA inhibited root growth obviously. The total absorption surface area, root number and root length per plant were significantly reduced by ABA treatment. The treatment of 10 μmol L–1ABA not only caused a dysplasia of both meristematic and elongation zone but also promoted the development of the central vascular tissue in root tips.
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Claims 17
Claim · model-written summary
Yangdao 6 and Nipponbare seedling roots showed negative phototropism.
- Taxon
- Rice
Oryza sativat0 - Material
- Yangdao 6 and Nipponbaree0
- Organ / stage
- seedling rootse0
- Outcome
- negative phototropisme0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seedling roots of both Yangdao 6 and Nipponbare had negative phototropism”
t0“Rice”
Claim · model-written summary
Yangdao 6 lateral and adventitious roots had stronger negative phototropism.
- Taxon
- RiceOryza sativat0
- Material
- Yangdao 6e0
- Organ / stage
- lateral roots and adventitious rootse0
- Outcome
- negative phototropisme0
- Direction
- strongere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the lateral roots and adventitious roots of Yangdao 6 showed stronger negative phototropism”
t0“Rice”
Claim · model-written summary
Rice root hormone levels and negative phototropism were closely linked.
- Taxon
- riceOryza sativae0
- Organ / stage
- rice roote0
- Outcome
- negative phototropism of rice roote0
- Qualifier
- closely linkede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant hormones and negative phototropism of rice root and root development are closely linked”
Claim · model-written summary
Unilateral illumination lowered endogenous IAA levels.
- Taxon
- RiceOryza sativat0
- Treatment
- unilateral illuminatione0
- Outcome
- endogenous IAAe0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under unilateral illumination, endogenous IAA, GA3 and ABA levels declined”
t0“Rice”
Claim · model-written summary
Unilateral illumination lowered endogenous GA3 levels.
- Taxon
- RiceOryza sativat0
- Treatment
- unilateral illuminatione0
- Outcome
- GA3e0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under unilateral illumination, endogenous IAA, GA3 and ABA levels declined”
t0“Rice”
Claim · model-written summary
Unilateral illumination lowered endogenous ABA levels.
- Taxon
- RiceOryza sativat0
- Treatment
- unilateral illuminatione0
- Outcome
- ABAe0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under unilateral illumination, endogenous IAA, GA3 and ABA levels declined”
t0“Rice”
Claim · model-written summary
Phytohormone content was lower on the irradiated root side than the shaded side.
- Taxon
- RiceOryza sativat0
- Organ / stage
- irradiated sidee0
- Outcome
- content of these phytohormonese0
- Direction
- lowere0
- Comparator
- shaded sidee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The content of these phytohormones in the irradiated side was lower than that in the shaded side”
t0“Rice”
Claim · model-written summary
Unilateral light and exogenous IAA induced many root hairs in Yangdao 6.
- Taxon
- RiceOryza sativat0
- Material
- Yangdao 6e0
- Treatment
- unilateral light and exogenous IAAe0
- Outcome
- root hairse0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The treatment of unilateral light and exogenous IAA induced a large number of root hairs in Yangdao 6”
t0“Rice”
Claim · model-written summary
The OsPIN1 a transgenic plant had a larger negative phototropism angle than conventional rice.
- Taxon
- riceOryza sativae0
- Material
- OsPIN1 a transgenic plante0
- Outcome
- angle of negative phototropisme0
- Direction
- lagere0
- Comparator
- conventional ricee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with conventional rice, the angle of negative phototropism was lager in OsPIN1 a transgenic plant”
Claim · model-written summary
Exogenous GA3 had no direct relationship with rice root negative phototropism.
- Taxon
- riceOryza sativae0
- Treatment
- exogenous GA3e0
- Outcome
- root negative phototropisme0
- Direction
- no direct relationshipe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no direct relationship between exogenous GA3 and ABA treatments and root negative phototropism of rice”
Claim · model-written summary
Exogenous ABA had no direct relationship with rice root negative phototropism.
- Taxon
- riceOryza sativae0
- Treatment
- ABA treatmentse0
- Outcome
- root negative phototropisme0
- Direction
- no direct relationshipe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no direct relationship between exogenous GA3 and ABA treatments and root negative phototropism of rice”
Claim · model-written summary
Exogenous ABA inhibited rice root growth.
- Taxon
- RiceOryza sativat0
- Treatment
- Exogenous ABAe0
- Outcome
- root growthe0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenous ABA inhibited root growth obviously”
t0“Rice”
Claim · model-written summary
ABA significantly reduced total root absorption surface area.
- Taxon
- RiceOryza sativat0
- Treatment
- ABA treatmente0
- Outcome
- total absorption surface areae0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The total absorption surface area, root number and root length per plant were significantly reduced by ABA treatment”
t0“Rice”
Claim · model-written summary
ABA significantly reduced root number.
- Taxon
- RiceOryza sativat0
- Treatment
- ABA treatmente0
- Outcome
- root numbere0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The total absorption surface area, root number and root length per plant were significantly reduced by ABA treatment”
t0“Rice”
Claim · model-written summary
ABA significantly reduced root length per plant.
- Taxon
- RiceOryza sativat0
- Treatment
- ABA treatmente0
- Outcome
- root length per plante0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The total absorption surface area, root number and root length per plant were significantly reduced by ABA treatment”
t0“Rice”
Claim · model-written summary
10 μmol L–1 ABA caused meristematic and elongation zone dysplasia.
- Taxon
- RiceOryza sativat0
- Treatment
- 10 μmol L–1ABAe0
- Outcome
- dysplasia of both meristematic and elongation zonee0
- Direction
- causede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The treatment of 10 μmol L–1ABA not only caused a dysplasia of both meristematic and elongation zone”
t0“Rice”
Claim · model-written summary
10 μmol L–1 ABA promoted central vascular tissue development.
- Taxon
- RiceOryza sativat0
- Organ / stage
- root tipse0
- Treatment
- 10 μmol L–1ABAe0
- Outcome
- development of the central vascular tissuee0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“10 μmol L–1ABA not only caused a dysplasia of both meristematic and elongation zone but also promoted the development of the central vascular tissue in root tips”
t0“Rice”
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