Abstract
The morphology and physiology of the response of two cultivars of Brassica napus to an anaerobic root medium was investigated. The cultivars Chikuzen and Topas showed a large reduction in growth rate when their roots were exposed to a de-oxygenated stagnant nutrient solution containing 0.1% w/v agar. Older seedlings (11 d old) were more sensitive to stagnant agar, expressed as biomass accumulation, than younger ones (5 d old). Brassica napus was characterized by a constitutively low root porosity (3–5%), typical for plant species with a low tolerance to waterlogging. A hypoxia pre- treatment (16 h; 2.25% O2) before exposure to de-oxygenated stagnant agar had no effect on the final number or length of lateral roots and adventitious roots. Brassica napus cv. Chikuzen is characterized by radial oxygen loss being most at the basal portion of the root, when a strong oxygen sink surrounds the root. Oxygen profiles through laterals of Brassica napus cv. Chikuzen show a typical pattern with low oxygen concentrations in the stele and somewhat higher levels in the cortex. Despite the continuum of intercellular air spaces in the root cortical tissue the lack of aerenchyma and therefore low rates of internal oxygen diffusion restricts root growth in anaerobic media and presumably contributes to the sensitivity of Brassica napus to waterlogging.
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Claims 7
Claim · model-written summary
Chikuzen and Topas growth rates fell under de-oxygenated stagnant agar nutrient solution.
- Taxon
- Brassica napus
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Material
- Chikuzen and Topase0
- Treatment
- de-oxygenated stagnant nutrient solution containing 0.1% w/v agare0
- Outcome
- growth ratee0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“The cultivars Chikuzen and Topas showed a large reduction in growth rate when their roots were exposed to a de-oxygenated stagnant nutrient solution containing 0.1% w/v agar”
t0“Brassica napus”
Claim · model-written summary
Older seedlings were more sensitive to stagnant agar in biomass accumulation than younger seedlings.
- Taxon
- Brassica napusBrassica napust0
- Organ / stage
- Older seedlingse0
- Treatment
- stagnant agare0
- Outcome
- biomass accumulatione0
- Direction
- more sensitivee0
- Comparator
- younger onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Older seedlings (11 d old) were more sensitive to stagnant agar, expressed as biomass accumulation, than younger ones (5 d old)”
t0“Brassica napus”
Claim · model-written summary
Brassica napus had constitutively low root porosity of 3–5%.
- Taxon
- Brassica napusBrassica napuse0
- Outcome
- root porositye0
- Direction
- lowe0
- Value
- 3–5%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Brassica napus was characterized by a constitutively low root porosity (3–5%)”
Claim · model-written summary
Hypoxia pretreatment did not change final lateral or adventitious root number or length.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- hypoxia pre- treatment (16 h; 2.25% O2)e0
- Outcome
- final number or length of lateral roots and adventitious rootse0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A hypoxia pre- treatment (16 h; 2.25% O2) before exposure to de-oxygenated stagnant agar had no effect on the final number or length of lateral roots and adventitious roots”
t0“Brassica napus”
Claim · model-written summary
Chikuzen had greatest radial oxygen loss at the root base with a strong surrounding oxygen sink.
- Taxon
- Brassica napusBrassica napuse0
- Material
- Chikuzene0
- Organ / stage
- basal portion of the roote0
- Outcome
- radial oxygen losse0
- Direction
- moste0
- Qualifier
- strong oxygen sinke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Brassica napus cv. Chikuzen is characterized by radial oxygen loss being most at the basal portion of the root, when a strong oxygen sink surrounds the root”
Claim · model-written summary
Chikuzen lateral roots had low stele oxygen and somewhat higher cortex oxygen.
- Taxon
- Brassica napusBrassica napuse0
- Material
- Chikuzene0
- Organ / stage
- stelee0
- Outcome
- oxygen concentrationse0
- Direction
- lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oxygen profiles through laterals of Brassica napus cv. Chikuzen show a typical pattern with low oxygen concentrations in the stele and somewhat higher levels in the cortex”
Claim · model-written summary
Lack of aerenchyma and low internal oxygen diffusion restrict root growth in anaerobic media and likely contribute to waterlogging sensitivity.
- Taxon
- Brassica napusBrassica napuse0
- Outcome
- root growth in anaerobic mediae0
- Qualifier
- lack of aerenchyma and therefore low rates of internal oxygen diffusione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the lack of aerenchyma and therefore low rates of internal oxygen diffusion restricts root growth in anaerobic media and presumably contributes to the sensitivity of Brassica napus to waterlogging”
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