Abstract
Safflower represents an important oil crop internationally and may have a production potential under low input conditions, but its putatively high phosphorous use efficiency is not sustained. This study aims to directly compare safflower with sunflower in terms of phosphorus use efficiency in nutrient solution under controlled conditions. Growth of both species responded strongly to increasing P supply. Safflower recovers less proportion of added P than sunflower. External P requirement ((g P supply (100 g dry matter (DM) produced) -1 ) was higher in safflower than sunflower. The efficiency of the crops for DM production based on accumulated P (mg P pot -1 , efficiency ratio), and P concentration in DM ((mg P (g DM) -1 ), utilization index) were interpreted using Michaelis-Menten kinetics as growth response curves. Accordingly, Km constant was lower in sunflower compared to safflower in terms of utilization index, but both were similar in terms of efficiency ratio. High Km constant in safflower in terms of utilization index indicates the high P concentration in tissues to produce 50% of potential maximum DM, consequently less efficient crop. Utilization efficiency contributed more than uptake efficiency in overall PUE in the efficient cultivar and could be the cause of its superiority in PUE. It can be concluded that safflower has a high requirement for P with respect to growth, sunflower is more efficient in terms of uptake and utilization of P at optimal and sub-optimal P supplies indicating that safflower can not be considered a low nutrient input crop compared to sunflower with respect to phosphorus.
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Claims 9
Claim · model-written summary
Growth of both safflower and sunflower responded strongly to increasing P supply.
- Taxon
- Safflower (Carthamus tinctorius L.) and Sunflower (Helianthus annuus L.)
Carthamus tinctorius
Helianthus annuust0 - Treatment
- increasing P supplye0
- Outcome
- Growthe0
- Direction
- increaseinferrede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth of both species responded strongly to increasing P supply”
t0“Safflower (Carthamus tinctorius L.) and Sunflower (Helianthus annuus L.)”
Claim · model-written summary
Safflower recovered a smaller proportion of added P than sunflower.
- Taxon
- SafflowerCarthamus tinctoriuse0
- Outcome
- proportion of added Pe0
- Direction
- lesse0
- Comparator
- sunflowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Safflower recovers less proportion of added P than sunflower”
Claim · model-written summary
External P requirement was higher in safflower than in sunflower.
- Taxon
- safflowerCarthamus tinctoriuse0
- Outcome
- External P requiremente0
- Direction
- highere0
- Comparator
- sunflowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“External P requirement ((g P supply (100 g dry matter (DM) produced) -1 ) was higher in safflower than sunflower”
Claim · model-written summary
The Km constant for utilization index was lower in sunflower than in safflower.
- Taxon
- sunflowerHelianthus annuuse0
- Outcome
- Km constante0
- Direction
- lowere0
- Qualifier
- utilization indexe0
- Comparator
- safflowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Km constant was lower in sunflower compared to safflower in terms of utilization index”
Claim · model-written summary
The Km constant for efficiency ratio was similar in sunflower and safflower.
- Taxon
- sunflowerHelianthus annuuse0
- Outcome
- Km constante0
- Direction
- similare0
- Qualifier
- efficiency ratioe0
- Comparator
- safflowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Km constant was lower in sunflower compared to safflower in terms of utilization index, but both were similar in terms of efficiency ratio”
Claim · model-written summary
The authors interpret the high Km constant for utilization index in safflower as a high tissue P concentration needed for 50% of potential maximum DM, making it a less efficient crop.
- Taxon
- safflowerCarthamus tinctoriuse0
- Outcome
- less efficient crope0
- Qualifier
- high P concentration in tissuese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High Km constant in safflower in terms of utilization index indicates the high P concentration in tissues to produce 50% of potential maximum DM, consequently less efficient crop”
Claim · model-written summary
In the efficient cultivar, utilization efficiency contributed more than uptake efficiency to overall PUE.
- Material
- efficient cultivare0
- Outcome
- overall PUEe0
- Qualifier
- Utilization efficiency contributed more than uptake efficiencye0
Not reportedTaxon
Verbatim
e0“Utilization efficiency contributed more than uptake efficiency in overall PUE in the efficient cultivar”
Claim · model-written summary
The authors conclude sunflower is more efficient in uptake and utilization of P at optimal and sub-optimal P supplies.
- Taxon
- sunflowerHelianthus annuuse0
- Outcome
- uptake and utilization of Pe0
- Direction
- more efficiente0
- Qualifier
- optimal and sub-optimal P suppliese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sunflower is more efficient in terms of uptake and utilization of P at optimal and sub-optimal P supplies”
Claim · model-written summary
The authors conclude safflower cannot be considered a low nutrient input crop compared to sunflower with respect to phosphorus.
- Taxon
- safflowerCarthamus tinctoriuse0
- Outcome
- low nutrient input crope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“safflower can not be considered a low nutrient input crop compared to sunflower with respect to phosphorus”
The same questions in other papers
phosphorus · growth · Helianthus annuus (common sunflower)Positive and negative results
31 papers in the same direction as this paper · 6 in the opposite direction
- positive
- negative
- negative
34 papers more in this group
See all 38 papers →phosphorus · growth · Carthamus tinctorius (safflower)Results agree
2 papers in the same direction as this paper
- positive
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.