Abstract
Abstract The activity of seminal and nodal root systems of winter wheat (cv. Avalon) in taking up NO 3 − and K + has been measured in solution culture using a split root technique. Plants in the tillering phase of growth (36 days old) were used for the experiment which lasted 20 days. During this time plant dry weights increased by a factor of 20, whilst root: shoot ratios and nutrient compositions remained constant. Inflows (uptake rate per unit root length) were 2–6 times higher for the nodal roots than for the seminal roots, with values varying between 1 and 9 pmol cm −1 s −1 for N and between 0.5 and 4 pmol cm −1 s −1 for K. When uptake was expressed on the basis of unit fresh weight of roots, values ranged from 1 to 2.3 pmol mg −1 s −1 for N and from 0.4 to 1.0 pmol mg −1 s −1 for K, and there were only very small differences in uptake efficiency between the nodal and seminal roots. Uptake rate per unit root decreased with plant age. This was caused by a decline in shoot demand due to the reduction of the relative growth rate. When either the nodal or seminal root system alone was supplied with nutrients, uptake rate per unit root increased and nutrient uptake per plant reached 72–92% of the control.
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Claims 8
Claim · model-written summary
Inflows were 2–6 times higher for nodal roots than for seminal roots of winter wheat.
- Taxon
- winter wheat
Triticum aestivume1 - Material
- Avalone1
- Organ / stage
- nodal rootse4
- Outcome
- Inflows (uptake rate per unit root length)e4
- Direction
- highere4
- Value
- 2–6 timese4
- Comparator
- seminal rootse4
- Setting
- solution culturee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“winter wheat (cv. Avalon)”
e2“has been measured in solution culture using a split root technique”
e4“Inflows (uptake rate per unit root length) were 2–6 times higher for the nodal roots than for the seminal roots”
Claim · model-written summary
Uptake efficiency per unit fresh root weight showed only very small differences between nodal and seminal roots of winter wheat.
- Taxon
- winter wheatTriticum aestivume1
- Outcome
- uptake efficiencye5
- Direction
- only very small differencese5
- Comparator
- seminal rootse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“winter wheat (cv. Avalon)”
e5“there were only very small differences in uptake efficiency between the nodal and seminal roots”
Claim · model-written summary
Uptake rate per unit root decreased with plant age in winter wheat.
- Taxon
- winter wheatTriticum aestivume1
- Treatment
- plant agee6
- Outcome
- Uptake rate per unit roote6
- Direction
- decreasede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“winter wheat (cv. Avalon)”
e6“Uptake rate per unit root decreased with plant age.”
Claim · model-written summary
The decrease in uptake rate per unit root with plant age was attributed to a decline in shoot demand from the reduced relative growth rate.
- Taxon
- winter wheatTriticum aestivume1
- Outcome
- Uptake rate per unit roote6
- Qualifier
- decline in shoot demand due to the reduction of the relative growth ratee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“winter wheat (cv. Avalon)”
e6“Uptake rate per unit root decreased with plant age.”
e7“This was caused by a decline in shoot demand due to the reduction of the relative growth rate.”
Claim · model-written summary
When the nodal or seminal root system alone was supplied with nutrients, uptake rate per unit root increased in winter wheat.
- Taxon
- winter wheatTriticum aestivume1
- Organ / stage
- nodal or seminal root systeme0
- Treatment
- supplied with nutrientse0
- Outcome
- uptake rate per unit roote0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“winter wheat (cv. Avalon)”
e0“When either the nodal or seminal root system alone was supplied with nutrients, uptake rate per unit root increased and nutrient uptake per plant reached 72–92% of the control.”
Claim · model-written summary
When the nodal or seminal root system alone was supplied with nutrients, nutrient uptake per plant reached 72–92% of the control in winter wheat.
- Taxon
- winter wheatTriticum aestivume1
- Treatment
- supplied with nutrientse0
- Outcome
- nutrient uptake per plante0
- Direction
- reachede0
- Value
- 72–92%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“winter wheat (cv. Avalon)”
e0“When either the nodal or seminal root system alone was supplied with nutrients, uptake rate per unit root increased and nutrient uptake per plant reached 72–92% of the control.”
Claim · model-written summary
Plant dry weights of winter wheat increased by a factor of 20 over the 20-day experiment.
- Taxon
- winter wheatTriticum aestivume1
- Outcome
- plant dry weightse3
- Direction
- increasede3
- Value
- a factor of 20e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“winter wheat (cv. Avalon)”
e3“During this time plant dry weights increased by a factor of 20, whilst root: shoot ratios and nutrient compositions remained constant.”
Claim · model-written summary
Root:shoot ratios and nutrient compositions of winter wheat remained constant during the experiment.
- Taxon
- winter wheatTriticum aestivume1
- Outcome
- root: shoot ratios and nutrient compositionse3
- Direction
- remained constante3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“winter wheat (cv. Avalon)”
e3“During this time plant dry weights increased by a factor of 20, whilst root: shoot ratios and nutrient compositions remained constant.”