Abstract
Abstract Wheat pasture poisoning is a metabolic disorder of ruminants, that occurs particularly in the spring, during a sudden spurt in plant growth, under conditions of optimum temperature, ample soil moisture and adequate mineral supply. To determine the effects of an increase in root temperature and four Ca levels on the shoot and root growth of winter wheat ( Triticum aestivum L. ‘Centurk’), seedlings were grown under three root temperature regimes (constant 8 °C, constant 16 °C, and increasing from 8‐16 °C), in nutrient solutions with four Ca levels (0.2,0.6,2.0, and 5.0 m M ). No significant differences due to Ca levels were found for growth rates of the shoots and roots (dry weight basis), nor for root extension rates. Growth rates of the shoots and roots (dry weight basis), and root extension rates were significantly slower for plants grown at 8 °C compared to those grown at 16 °C. Lateral root growth, in particular, was depressed in plants grown at a cold root temperature. The mean root diameter was significantly greater at 8 °C than at 16 °C, apparently due to the greater proportion of main root axes with larger root diameters at a cold root temperature. Plants transferred to 16 °C had growth rates of the shoots and roots that were intermediate, relative to those grown at constant low or constant high root temperatures. A lag period of 1 wk was observed before shoot and root dry weights of plants transferred to 16 °C increased, compared to those maintained at 8 °C. Thus, root temperatures play a major role in modifying shoot and root growth parameters.
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Claims 6
Claim · model-written summary
Calcium levels produced no significant difference in shoot and root growth rates or root extension.
- Taxon
- winter wheat
Triticum aestivumt0 - Treatment
- Ca levelse0
- Outcome
- growth rates of the shoots and roots (dry weight basis), nor for root extension ratese0
- Direction
- No significant differencese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant differences due to Ca levels were found for growth rates of the shoots and roots (dry weight basis), nor for root extension rates.”
t0“Winter Wheat”
Claim · model-written summary
At 8 °C, shoot and root growth and root extension were significantly slower than at 16 °C.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- 8 °Ce0
- Outcome
- Growth rates of the shoots and roots (dry weight basis), and root extension ratese0
- Direction
- slowere0
- Comparator
- 16 °Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth rates of the shoots and roots (dry weight basis), and root extension rates were significantly slower for plants grown at 8 °C compared to those grown at 16 °C.”
t0“Winter Wheat”
Claim · model-written summary
Cold root temperature depressed lateral root growth.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- cold root temperaturee0
- Outcome
- Lateral root growthe0
- Direction
- depressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lateral root growth, in particular, was depressed in plants grown at a cold root temperature.”
t0“Winter Wheat”
Claim · model-written summary
Mean root diameter was significantly greater at 8 °C than 16 °C.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- 8 °Ce0
- Outcome
- mean root diametere0
- Direction
- greatere0
- Comparator
- 16 °Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mean root diameter was significantly greater at 8 °C than at 16 °C”
t0“Winter Wheat”
Claim · model-written summary
Transferred plants had intermediate shoot and root growth rates.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- transferred to 16 °Ce0
- Outcome
- growth rates of the shoots and rootse0
- Direction
- intermediatee0
- Comparator
- constant low or constant high root temperaturese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants transferred to 16 °C had growth rates of the shoots and roots that were intermediate, relative to those grown at constant low or constant high root temperatures.”
t0“Winter Wheat”
Claim · model-written summary
Transferred plants showed a one week lag before shoot and root dry weights increased.
- Taxon
- winter wheatTriticum aestivumt0
- Outcome
- shoot and root dry weightse0
- Direction
- increasede0
- Value
- 1 wke0
- Comparator
- 8 °Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A lag period of 1 wk was observed before shoot and root dry weights of plants transferred to 16 °C increased, compared to those maintained at 8 °C.”
t0“Winter Wheat”
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