Abstract
Abstract Root respiration of the tap root forming species Hypochaeris radicata L. was measured during tap root formation. A comparison was made of two subspecies: H. radicata L. ssp. radicata L., a subspecies from relatively rich soils, and H. radicata L. ssp. ericetorum Van Soest, a subspecies from poor acidic soils. Root respiration was high and to a large extent inhibited by hydroxamic acid (SHAM) before the start of the tap root formation, indicating a high activity of an alternative non‐phosphorylative electron transport chain. The rate of root respiration was much lower and less sensitive to SHAM when a considerable tap root was present. However, root respiration was also cyanide‐resistant when a tap root was present, indicating that the alternative pathway was still present. A decreased rate of root respiration coincided with an increase of the content of storage carbohydrates, mainly in the tap root. The level of reducing sugars was constant throughout the experimental period, and it was concluded that the activity of the alternative oxidative pathway was significant in oxidation of sugars that could not be utilized for purposes like energy production, the formation of intermediates for growth or for storage. Root respiration decreased after the formation of a tap root. This decrease could neither be attributed to a gradual disappearance of the alternative chain, nor to a decreased level of reducing sugars. No differences in respiratory metabolism between the two subspecies have been observed, suggesting that a high activity of the alternative oxidative pathway is not significant in adaptation of the present two subspecies to relatively nutrient‐rich or poor soils.
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Claims 12
Claim · model-written summary
Root respiration was high before tap root formation began.
- Taxon
- Hypochaeris radicata
Hypochaeris radicatae2 - Organ / stage
- tap root formatione1
- Outcome
- Root respiratione1
- Direction
- highe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Root respiration was high and to a large extent inhibited by hydroxamic acid (SHAM) before the start of the tap root formation”
e2“Root respiration of the tap root forming species Hypochaeris radicata L.”
Claim · model-written summary
Hydroxamic acid (SHAM) inhibited root respiration to a large extent before tap root formation.
- Taxon
- Hypochaeris radicataHypochaeris radicatae2
- Treatment
- hydroxamic acid (SHAM)e1
- Outcome
- Root respiratione1
- Direction
- inhibitede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Root respiration was high and to a large extent inhibited by hydroxamic acid (SHAM) before the start of the tap root formation”
e2“Root respiration of the tap root forming species Hypochaeris radicata L.”
Claim · model-written summary
The rate of root respiration was much lower when a considerable tap root was present.
- Taxon
- Hypochaeris radicataHypochaeris radicatae2
- Organ / stage
- considerable tap roote3
- Outcome
- rate of root respiratione3
- Direction
- much lowere3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“The rate of root respiration was much lower and less sensitive to SHAM when a considerable tap root was present”
e2“Root respiration of the tap root forming species Hypochaeris radicata L.”
Claim · model-written summary
Root respiration was less sensitive to SHAM when a considerable tap root was present.
- Taxon
- Hypochaeris radicataHypochaeris radicatae2
- Treatment
- SHAMe3
- Outcome
- rate of root respiratione3
- Direction
- less sensitivee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“The rate of root respiration was much lower and less sensitive to SHAM when a considerable tap root was present”
e2“Root respiration of the tap root forming species Hypochaeris radicata L.”
Claim · model-written summary
A decrease in root respiration coincided with an increase in storage carbohydrate content, mainly in the tap root.
- Taxon
- Hypochaeris radicataHypochaeris radicatae2
- Organ / stage
- tap roote4
- Outcome
- content of storage carbohydratese4
- Direction
- increasee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“A decreased rate of root respiration coincided with an increase of the content of storage carbohydrates, mainly in the tap root”
e2“Root respiration of the tap root forming species Hypochaeris radicata L.”
Claim · model-written summary
The level of reducing sugars was constant throughout the experimental period.
- Taxon
- Hypochaeris radicataHypochaeris radicatae2
- Outcome
- level of reducing sugarse5
- Qualifier
- constant throughout the experimental periode5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“The level of reducing sugars was constant throughout the experimental period”
e2“Root respiration of the tap root forming species Hypochaeris radicata L.”
Claim · model-written summary
Root respiration decreased after the formation of a tap root.
- Taxon
- Hypochaeris radicataHypochaeris radicatae2
- Organ / stage
- a tap roote6
- Outcome
- Root respiratione6
- Direction
- decreasede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Root respiration decreased after the formation of a tap root”
e2“Root respiration of the tap root forming species Hypochaeris radicata L.”
Claim · model-written summary
Root respiration was cyanide-resistant when a tap root was present.
- Taxon
- Hypochaeris radicataHypochaeris radicatae2
- Organ / stage
- a tap roote7
- Outcome
- root respiratione7
- Qualifier
- cyanide‐resistante7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“root respiration was also cyanide‐resistant when a tap root was present”
e2“Root respiration of the tap root forming species Hypochaeris radicata L.”
Claim · model-written summary
The alternative oxidative pathway was significant in oxidising sugars that could not be utilised for energy, growth or storage.
- Taxon
- Hypochaeris radicataHypochaeris radicatae2
- Outcome
- oxidation of sugars that could not be utilizede6
- Qualifier
- activity of the alternative oxidative pathwaye6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“it was concluded that the activity of the alternative oxidative pathway was significant in oxidation of sugars that could not be utilized for purposes like energy production, the formation of intermediates for growth or for storage”
e2“Root respiration of the tap root forming species Hypochaeris radicata L.”
Claim · model-written summary
The decrease in root respiration after tap root formation was not explained by loss of the alternative chain or by lower reducing sugars.
- Taxon
- Hypochaeris radicataHypochaeris radicatae2
- Outcome
- This decreasee6
- Qualifier
- gradual disappearance of the alternative chaine6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“This decrease could neither be attributed to a gradual disappearance of the alternative chain, nor to a decreased level of reducing sugars”
e2“Root respiration of the tap root forming species Hypochaeris radicata L.”
Claim · model-written summary
No differences in respiratory metabolism were observed between the two subspecies.
- Taxon
- Hypochaeris radicataHypochaeris radicatae2
- Outcome
- respiratory metabolisme6
- Direction
- No differencese6
- Comparator
- two subspeciese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“No differences in respiratory metabolism between the two subspecies have been observed”
e2“Root respiration of the tap root forming species Hypochaeris radicata L.”
Claim · model-written summary
A high activity of the alternative oxidative pathway is not significant in adaptation of the two subspecies to their soils.
- Taxon
- Hypochaeris radicataHypochaeris radicatae2
- Outcome
- adaptation of the present two subspeciese6
- Qualifier
- a high activity of the alternative oxidative pathwaye6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“a high activity of the alternative oxidative pathway is not significant in adaptation of the present two subspecies”
e2“Root respiration of the tap root forming species Hypochaeris radicata L.”