Abstract
Abstract In experiments with rooted cuttings of aspen ( Populus tremula L). with a small leaf area, it was found that the roots grew well as long as there was no shoot growth. The onset of shoot growth was followed by a period of decreased root growth. When the leaf area had increased sufficiently, root growth recovered. Decreasing the shoot growth by removal of growth points in the shoot or by short day treatment increased the fraction of photosynthesis products used for root growth, leading to increased root/shoot ratios. Competition between growing shoots and roots for carbohydrates formed in photosynthesis is considered to cause the effects noted and to be of importance for maintaining the balance between the root and shoot systems.
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Claims 7
Claim · model-written summary
Roots grew well when shoot growth was absent.
Verbatim
e0“the roots grew well as long as there was no shoot growth”
t0“Aspen”
Claim · model-written summary
Root growth decreased after shoot growth began.
Verbatim
e0“The onset of shoot growth was followed by a period of decreased root growth”
t0“Aspen”
Claim · model-written summary
Root growth recovered after leaf area increased sufficiently.
Verbatim
e0“When the leaf area had increased sufficiently, root growth recovered”
t0“Aspen”
Claim · model-written summary
Removing shoot growth points increased the fraction of photosynthate used for root growth.
- Taxon
- aspent0
- Treatment
- removal of growth points in the shoote0
- Outcome
- fraction of photosynthesis products used for root growthe0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Decreasing the shoot growth by removal of growth points in the shoot or by short day treatment increased the fraction of photosynthesis products used for root growth, leading to increased root/shoot ratios”
t0“Aspen”
Claim · model-written summary
Short-day treatment increased the fraction of photosynthate used for root growth.
- Taxon
- aspent0
- Treatment
- short day treatmente0
- Outcome
- fraction of photosynthesis products used for root growthe0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Decreasing the shoot growth by removal of growth points in the shoot or by short day treatment increased the fraction of photosynthesis products used for root growth, leading to increased root/shoot ratios”
t0“Aspen”
Claim · model-written summary
Reducing shoot growth increased root/shoot ratios.
Not reportedComparator
Verbatim
e0“Decreasing the shoot growth by removal of growth points in the shoot or by short day treatment increased the fraction of photosynthesis products used for root growth, leading to increased root/shoot ratios”
t0“Aspen”
Claim · model-written summary
The authors attribute the growth balance to competition for photosynthetic carbohydrates.
Verbatim
e0“Competition between growing shoots and roots for carbohydrates formed in photosynthesis is considered to cause the effects noted and to be of importance for maintaining the balance between the root and shoot systems”
t0“Aspen”