Abstract
To investigate lignification process and its physiological significance under water-deficit condition, the responses of peroxidases, polyphenol oxidase (PPO) and phenylalanine ammonia-lyase (PAL) in relation to leaf water status to the short term of water deficit treatment in the leaves with different maturities in forage rape were measured. The significant decrease in relative water content (RWC) and leaf osmotic potential (${\Psi}{\pi}$) were apparent after 5 d of water-deficit treatment. The activity of guaiacol peroxidase (GPOD), ascorbate peroxidase (APOD), coniferyl alcohol peroxidase (CPOD), and syringaldazine peroxidase (SPOD) was depressed especially in middle and old leaves when compared with that of control leaves. On the other hand, in young leaves, a significant increase in CPOD (+34%) and SPOD (+24%) activity as affected by water-deficit treatment was apparent. The activation of PAL and PPO was observed in middle and old leaves for PAL and in young and middle leaves for PPO. These results suggest that peroxidases in middle and old leaves did not involve in lignification under mild water-deficit stress, whereas CPOD and SPOD in young leaves participate in lignification by a coordination with PAL and PPO to incorporate phenol and lignin into the cell walls.
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Claims 9
Claim · model-written summary
Water deficit significantly decreased relative water content and leaf osmotic potential in forage rape.
- Taxon
- forage rapee0
- Treatment
- water-deficit treatmente2
- Outcome
- relative water content (RWC) and leaf osmotic potentiale1
- Direction
- decreasee1
Not reportedComparator
Verbatim
e0“in the leaves with different maturities in forage rape”
e1“The significant decrease in relative water content (RWC) and leaf osmotic potential”
e2“after 5 d of water-deficit treatment”
Claim · model-written summary
Water deficit depressed GPOD, APOD and CPOD activity in middle and old forage rape leaves compared with control leaves.
Verbatim
e0“in the leaves with different maturities in forage rape”
e1“after 5 d of water-deficit treatment”
e2“The activity of guaiacol peroxidase (GPOD), ascorbate peroxidase (APOD), coniferyl alcohol peroxidase (CPOD), and syringaldazine peroxidase (SPOD) was depressed especially in middle and old leaves when compared with that of control leaves”
Claim · model-written summary
Water deficit depressed SPOD activity in middle and old forage rape leaves compared with control leaves.
Verbatim
e0“in the leaves with different maturities in forage rape”
e1“after 5 d of water-deficit treatment”
e2“The activity of guaiacol peroxidase (GPOD), ascorbate peroxidase (APOD), coniferyl alcohol peroxidase (CPOD), and syringaldazine peroxidase (SPOD) was depressed especially in middle and old leaves when compared with that of control leaves”
Claim · model-written summary
Water deficit increased CPOD activity by 34% in young forage rape leaves.
- Taxon
- forage rapee0
- Organ / stage
- young leavese1
- Treatment
- water-deficit treatmente1
- Outcome
- CPODe1
- Direction
- increasee1
- Value
- +34%e1
Not reportedComparator
Verbatim
e0“in the leaves with different maturities in forage rape”
e1“in young leaves, a significant increase in CPOD (+34%) and SPOD (+24%) activity as affected by water-deficit treatment”
Claim · model-written summary
Water deficit increased SPOD activity by 24% in young forage rape leaves.
- Taxon
- forage rapee0
- Organ / stage
- young leavese1
- Treatment
- water-deficit treatmente1
- Outcome
- SPODe1
- Direction
- increasee1
- Value
- +24%e1
Not reportedComparator
Verbatim
e0“in the leaves with different maturities in forage rape”
e1“in young leaves, a significant increase in CPOD (+34%) and SPOD (+24%) activity as affected by water-deficit treatment”
Claim · model-written summary
PAL activation was observed in middle and old forage rape leaves.
Verbatim
e0“in the leaves with different maturities in forage rape”
e1“The activation of PAL and PPO was observed in middle and old leaves for PAL and in young and middle leaves for PPO”
Claim · model-written summary
PPO activation was observed in young and middle forage rape leaves.
Verbatim
e0“in the leaves with different maturities in forage rape”
e1“The activation of PAL and PPO was observed in middle and old leaves for PAL and in young and middle leaves for PPO”
Claim · model-written summary
Peroxidases in middle and old forage rape leaves did not take part in lignification under mild water deficit.
Verbatim
e0“in the leaves with different maturities in forage rape”
e1“peroxidases in middle and old leaves did not involve in lignification under mild water-deficit stress”
Claim · model-written summary
CPOD and SPOD in young forage rape leaves participate in lignification together with PAL and PPO.
Verbatim
e0“in the leaves with different maturities in forage rape”
e1“CPOD and SPOD in young leaves participate in lignification by a coordination with PAL and PPO to incorporate phenol and lignin into the cell walls”
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