Abstract
Abstract Temperatures considered optimum for root growth only occur near the soil surface in interior Alaska, and current literature inadequately describes low soil temperature (i.e. 5 °C) effects on plant development. This study determined shoot and root characteristics of barley ( Hordeum vulgare L.) when grown at varying root zone temperatures (RZT). Leaf area, number of leaves and stems, and aerial and root biomass were assessed at heading of barley grown in pots in a glasshouse at RZT of 5, 10, and 15 °C. Plant stage and height were recorded twice weekly. Pots were sectioned at 5 and 10 cm below the soil surface to obtain root lengths and dry weights. Three replications of the experiment used sand as the soil media, a fourth replication used a soil/peat mixture. Plant water use was determined by subtracting the amount of water leached through pots from that added. Plants grown at 5 °C RZT had a 30% slower leaf appearance rate, 50% fewer stems and leaves, and 70% less leaf area than grown at 15 °C. Root length density increased with increasing RZT. Water use and water‐use efficiency were least at 5 °C RZT. Greater specific leaf weights at 5 °C RZT indicated greater photosynthetic efficiency, but reduced water uptake resulted in less dry matter production than at 15 °C RZT.
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Claims 7
Claim · model-written summary
Barley grown at 5 °C root zone temperature had a 30% slower leaf appearance rate than at 15 °C.
- Taxon
- Barley
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- 5 °C RZTe0
- Outcome
- leaf appearance ratee0
- Direction
- slowere0
- Value
- 30%e0
- Comparator
- 15 °Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Plants grown at 5 °C RZT had a 30% slower leaf appearance rate, 50% fewer stems and leaves, and 70% less leaf area than grown at 15 °C”
t0“Barley”
Claim · model-written summary
Barley grown at 5 °C root zone temperature had 50% fewer stems and leaves than at 15 °C.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- 5 °C RZTe0
- Outcome
- stems and leavese0
- Direction
- fewere0
- Value
- 50%e0
- Comparator
- 15 °Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants grown at 5 °C RZT had a 30% slower leaf appearance rate, 50% fewer stems and leaves, and 70% less leaf area than grown at 15 °C”
t0“Barley”
Claim · model-written summary
Barley grown at 5 °C root zone temperature had 70% less leaf area than at 15 °C.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- 5 °C RZTe0
- Outcome
- leaf areae0
- Direction
- lesse0
- Value
- 70%e0
- Comparator
- 15 °Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants grown at 5 °C RZT had a 30% slower leaf appearance rate, 50% fewer stems and leaves, and 70% less leaf area than grown at 15 °C”
t0“Barley”
Claim · model-written summary
Barley root length density increased with increasing root zone temperature.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- increasing RZTe0
- Outcome
- Root length densitye0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root length density increased with increasing RZT”
t0“Barley”
Claim · model-written summary
Barley water use and water-use efficiency were least at 5 °C root zone temperature.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- 5 °C RZTe0
- Outcome
- Water use and water‐use efficiencye0
- Direction
- leaste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water use and water‐use efficiency were least at 5 °C RZT”
t0“Barley”
Claim · model-written summary
Greater specific leaf weights at 5 °C root zone temperature in barley indicated greater photosynthetic efficiency.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- 5 °C RZTe0
- Outcome
- photosynthetic efficiencye0
- Direction
- greatere0
- Qualifier
- Greater specific leaf weightse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Greater specific leaf weights at 5 °C RZT indicated greater photosynthetic efficiency”
t0“Barley”
Claim · model-written summary
Reduced water uptake resulted in less dry matter production in barley at 5 °C root zone temperature than at 15 °C.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- dry matter productione0
- Direction
- lesse0
- Qualifier
- reduced water uptakee0
- Comparator
- 15 °C RZTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced water uptake resulted in less dry matter production than at 15 °C RZT”
t0“Barley”