Abstract
Macduff, J. H., Hopper, M. J. and Wild, A. 1987. The effect of root temperature on growth and uptake of ammonium and nitrate by Brassica napus L. in flowing solution culture. I. Growth.—J. exp. Bot. 38: 42–52 Oilseed rape (Brassica napus L. cv. Bien venu) was grown for 49 d in flowing nutrient solution at pH 6·0 with root temperature decrementally reduced from 20°C to 5°C; and then exposed to different root temperatures (3, 5, 7, 9, 11, 13,17 or 25°C) held constant for 14 d. The air temperature was 20/15°C day/night and nitrogen was supplied automatically to maintain 10 mmol m–3 NH4NO3 in solution. Total dry matter production was exponential with time and similar at all root temperatures giving a specific growth rate of 0·0784 g g–1 d–1. Partitioning of dry matter was influenced by root temperature; shoot: root ratios increased during treatment at 17°C and 25°C but decreased after 5 d at 3°C and 5°C. The ratio of shoot specific growth rate: root specific growth rate increased with the ratio of water soluble carbohydrates (shoot: root). Concentrations of water soluble carbohydrates in shoot and root were inversely related to root temperature; at 3, 5 and 7°C they increased in stem + petioles throughout treatment, coinciding with a decrease in the weight of tissue water per unit dry matter. These results suggest that the accumulation of soluble carbohydrates at low temperature is the result of metabolic imbalance and of osmotic adjustment to water stress.
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Claims 12
Claim · model-written summary
Total dry matter production was exponential and similar at all root temperatures.
- Taxon
- Brassica napus L.
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napuse1 - Outcome
- Total dry matter productione0
- Direction
- similare0
- Value
- 0·0784 g g–1 d–1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“Total dry matter production was exponential with time and similar at all root temperatures giving a specific growth rate of 0·0784 g g–1 d–1”
e1“Oilseed rape (Brassica napus L. cv. Bien venu)”
Claim · model-written summary
Shoot to root dry matter ratio increased at 17°C.
- Taxon
- Brassica napus L.Brassica napuse1
- Treatment
- 17°Ce0
- Outcome
- shoot: root ratiose0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shoot: root ratios increased during treatment at 17°C and 25°C”
e1“Oilseed rape (Brassica napus L. cv. Bien venu)”
Claim · model-written summary
Shoot to root dry matter ratio increased at 25°C.
- Taxon
- Brassica napus L.Brassica napuse1
- Treatment
- 25°Ce0
- Outcome
- shoot: root ratiose0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shoot: root ratios increased during treatment at 17°C and 25°C”
e1“Oilseed rape (Brassica napus L. cv. Bien venu)”
Claim · model-written summary
Shoot to root dry matter ratio decreased after five days at 3°C.
- Taxon
- Brassica napus L.Brassica napuse2
- Treatment
- 3°Ce0
- Outcome
- shoot: root ratiose1
- Direction
- decreasede0
- Qualifier
- after 5 de0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased after 5 d at 3°C and 5°C”
e1“shoot: root ratios increased”
e2“Oilseed rape (Brassica napus L. cv. Bien venu)”
Claim · model-written summary
Shoot to root dry matter ratio decreased after five days at 5°C.
- Taxon
- Brassica napus L.Brassica napuse2
- Treatment
- 5°Ce0
- Outcome
- shoot: root ratiose1
- Direction
- decreasede0
- Qualifier
- after 5 de0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased after 5 d at 3°C and 5°C”
e1“shoot: root ratios increased”
e2“Oilseed rape (Brassica napus L. cv. Bien venu)”
Claim · model-written summary
The ratio of shoot to root specific growth rates rose with the ratio of soluble carbohydrates.
- Taxon
- Brassica napus L.Brassica napuse1
- Compound
- water soluble carbohydratese0
- Outcome
- ratio of shoot specific growth rate: root specific growth ratee0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ratio of shoot specific growth rate: root specific growth rate increased with the ratio of water soluble carbohydrates (shoot: root)”
e1“Oilseed rape (Brassica napus L. cv. Bien venu)”
Claim · model-written summary
Soluble carbohydrate concentrations in shoots and roots were inversely related to root temperature.
- Taxon
- Brassica napus L.Brassica napuse1
- Treatment
- root temperaturee0
- Outcome
- Concentrations of water soluble carbohydrates in shoot and roote0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentrations of water soluble carbohydrates in shoot and root were inversely related to root temperature”
e1“Oilseed rape (Brassica napus L. cv. Bien venu)”
Claim · model-written summary
Stem and petiole soluble carbohydrates increased throughout treatment at 3°C.
- Taxon
- Brassica napus L.Brassica napuse2
- Organ / stage
- stem + petiolese0
- Treatment
- 3e0
- Outcome
- Concentrations of water soluble carbohydratese1
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at 3, 5 and 7°C they increased in stem + petioles throughout treatment”
e1“Concentrations of water soluble carbohydrates”
e2“Oilseed rape (Brassica napus L. cv. Bien venu)”
Claim · model-written summary
Stem and petiole soluble carbohydrates increased throughout treatment at 5°C.
- Taxon
- Brassica napus L.Brassica napuse2
- Organ / stage
- stem + petiolese0
- Treatment
- 5e0
- Outcome
- Concentrations of water soluble carbohydratese1
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at 3, 5 and 7°C they increased in stem + petioles throughout treatment”
e1“Concentrations of water soluble carbohydrates”
e2“Oilseed rape (Brassica napus L. cv. Bien venu)”
Claim · model-written summary
Stem and petiole soluble carbohydrates increased throughout treatment at 7°C.
- Taxon
- Brassica napus L.Brassica napuse2
- Organ / stage
- stem + petiolese0
- Treatment
- 7°Ce0
- Outcome
- Concentrations of water soluble carbohydratese1
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at 3, 5 and 7°C they increased in stem + petioles throughout treatment”
e1“Concentrations of water soluble carbohydrates”
e2“Oilseed rape (Brassica napus L. cv. Bien venu)”
Claim · model-written summary
Tissue water per dry matter decreased as stem and petiole carbohydrates accumulated at low root temperature.
- Taxon
- Brassica napus L.Brassica napuse1
- Outcome
- weight of tissue water per unit dry mattere0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“coinciding with a decrease in the weight of tissue water per unit dry matter”
e1“Oilseed rape (Brassica napus L. cv. Bien venu)”
Claim · model-written summary
The authors attribute low-temperature soluble carbohydrate accumulation to metabolic imbalance and osmotic adjustment to water stress.
- Taxon
- Brassica napus L.Brassica napuse1
- Outcome
- accumulation of soluble carbohydratese0
- Qualifier
- metabolic imbalance and of osmotic adjustment to water stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the accumulation of soluble carbohydrates at low temperature is the result of metabolic imbalance and of osmotic adjustment to water stress”
e1“Oilseed rape (Brassica napus L. cv. Bien venu)”