Abstract
Plant roots are often severed during transplanting, but plants can recover from partial root loss through compensatory growth. However, the mechanisms regulating this compensatory growth are not fully understood. Here, we showed that cutting rice (Oryza sativa L.) seminal roots induces high auxin accumulation around the incision site. This auxin accumulation enhanced the expression of the transcription factor WUSCHEL-RELATED HOMEOBOX10 (OsWOX10) and promoted lateral root (LR) primordia development into long and thick L-type LRs, thus compensating for the partial loss of seminal roots. Removing the coleoptile or blocking shoot-to-root auxin transport inhibited auxin accumulation around the incision site and abolished compensatory LR growth. Three auxin efflux proteins, OsPIN1b, OsPIN1c, and OsPIN9, are expressed in the root vasculature and epidermis in the root tip meristem zone, and redundantly control shoot-to-root auxin transport and root tip auxin distribution. Knocking out all 3 PIN genes caused severe growth inhibition and loss of gravitropism, as well as diminished cutting-induced auxin accumulation and compensatory LR growth, whereas knockout of 1 or 2 genes had little effect. Soil transplanting experiments showed that weakened compensatory LR growth hinders plant growth and nutrient absorption after cutting. Jasmonic acid, reactive oxygen species, and cytosolic calcium signaling, which are important for wounding responses, were not involved in compensatory LR growth. Our study reveals that OsPIN1b, OsPIN1c, and OsPIN9 mediate shoot-to-root auxin transport, and that auxin accumulation around the incision site triggers compensatory LR growth after physical damage to rice roots.
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Claims 14
Claim · model-written summary
Cutting rice seminal roots induced auxin accumulation at the incision site.
- Taxon
- rice
Oryza sativae0 - Organ / stage
- seminal rootse0
- Treatment
- cuttinge0
- Outcome
- auxin accumulatione0
- Direction
- highe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cutting rice (Oryza sativa L.) seminal roots induces high auxin accumulation around the incision site”
Claim · model-written summary
Auxin accumulation enhanced OsWOX10 expression.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This auxin accumulation enhanced the expression of the transcription factor WUSCHEL-RELATED HOMEOBOX10 (OsWOX10)”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Auxin accumulation promoted lateral root primordia into long thick L-type roots.
- Taxon
- riceOryza sativae2
- Compound
- auxine1
- Outcome
- lateral root (LR) primordia development into long and thick L-type LRse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“promoted lateral root (LR) primordia development into long and thick L-type LRs”
e1“This auxin accumulation”
e2“rice (Oryza sativa L.)”
Claim · model-written summary
Removing the coleoptile inhibited auxin accumulation at the incision.
- Taxon
- riceOryza sativae1
- Treatment
- Removing the coleoptilee0
- Outcome
- auxin accumulatione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Removing the coleoptile or blocking shoot-to-root auxin transport inhibited auxin accumulation around the incision site”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Blocking shoot-to-root auxin transport inhibited auxin accumulation.
- Taxon
- riceOryza sativae1
- Treatment
- blocking shoot-to-root auxin transporte0
- Outcome
- auxin accumulatione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“blocking shoot-to-root auxin transport inhibited auxin accumulation around the incision site”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Removing the coleoptile abolished compensatory lateral root growth.
- Taxon
- riceOryza sativae1
- Treatment
- Removing the coleoptilee0
- Outcome
- compensatory LR growthe0
- Direction
- abolishede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Removing the coleoptile or blocking shoot-to-root auxin transport inhibited auxin accumulation around the incision site and abolished compensatory LR growth”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Blocking auxin transport abolished compensatory lateral root growth.
- Taxon
- riceOryza sativae1
- Treatment
- blocking shoot-to-root auxin transporte0
- Outcome
- compensatory LR growthe0
- Direction
- abolishede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“blocking shoot-to-root auxin transport inhibited auxin accumulation around the incision site and abolished compensatory LR growth”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
OsPIN1b, OsPIN1c, and OsPIN9 were expressed in root vasculature and epidermis.
- Taxon
- riceOryza sativae1
- Gene
- OsPIN1b, OsPIN1c, and OsPIN9e0
- Outcome
- expressed in the root vasculature and epidermise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“OsPIN1b, OsPIN1c, and OsPIN9, are expressed in the root vasculature and epidermis in the root tip meristem zone”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
The three PIN proteins redundantly control shoot-to-root auxin transport and root tip auxin distribution.
- Taxon
- riceOryza sativae1
- Gene
- OsPIN1b, OsPIN1c, and OsPIN9e0
- Outcome
- shoot-to-root auxin transport and root tip auxin distributione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“OsPIN1b, OsPIN1c, and OsPIN9, are expressed in the root vasculature and epidermis in the root tip meristem zone, and redundantly control shoot-to-root auxin transport and root tip auxin distribution”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Triple PIN knockout caused severe growth inhibition and loss of gravitropism.
- Taxon
- riceOryza sativae1
- Treatment
- Knocking out all 3 PIN genese0
- Outcome
- growth inhibition and loss of gravitropisme0
- Direction
- inhibitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Knocking out all 3 PIN genes caused severe growth inhibition and loss of gravitropism”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Triple PIN knockout diminished cutting induced auxin accumulation and compensatory lateral root growth.
- Taxon
- riceOryza sativae1
- Treatment
- Knocking out all 3 PIN genese0
- Outcome
- cutting-induced auxin accumulation and compensatory LR growthe0
- Direction
- diminishede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Knocking out all 3 PIN genes caused severe growth inhibition and loss of gravitropism, as well as diminished cutting-induced auxin accumulation and compensatory LR growth”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Knockout of one or two PIN genes had little effect.
- Taxon
- riceOryza sativae1
- Treatment
- knockout of 1 or 2 genese0
- Outcome
- little effecte0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“knockout of 1 or 2 genes had little effect”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Weakened compensatory lateral root growth hindered plant growth and nutrient absorption after cutting.
- Taxon
- riceOryza sativae1
- Organ / stage
- LRe0
- Outcome
- plant growth and nutrient absorptione0
- Direction
- hinderse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“weakened compensatory LR growth hinders plant growth and nutrient absorption after cutting”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Jasmonic acid, reactive oxygen species, and cytosolic calcium signaling were not involved in compensatory lateral root growth.
- Taxon
- riceOryza sativae1
- Compound
- Jasmonic acide0
- Outcome
- compensatory LR growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Jasmonic acid, reactive oxygen species, and cytosolic calcium signaling, which are important for wounding responses, were not involved in compensatory LR growth”
e1“rice (Oryza sativa L.)”
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