Abstract
Abstract Needles of 20‐year‐old Scots pine trees ( Pinus silvestris L.) were permitted to photoassimilate 14 CO 2 for 1 h on different dates during the growing season. The loss of radioactivity from current, 1‐year‐old, and 2‐year‐old needles was followed, and the translocation of photoassimilated 14 CO 2 from older needle age‐classes to the elongating new needles studied. The effects of good mineral and water supply on translocation were also considered. In the spring, 1‐year‐old and 2‐year‐old needles accumulated 14 C. These reserves, together with current photosynthate, were utilized when the trees started growing. The 1‐year‐old needles exported 14 C to the current needles during the first weeks of elongation of the later, while no such translocation occurred from the 2‐year‐old needles. Removal of the 1‐year‐old needles resulted in translocation of assimilates from the 2‐year‐old needles to the current needles. The general pattern of translocation observed in the control trees was not changed when the trees were fertilized and irrigated. The new needles started to export assimilates in the middle of July when the photosynthetic rate per needle was comparable with that of the older age‐classes. This occurred about 4 weeks after positive net photosynthesis was first measured for the current shoot. The current needles of trees with good nutrient and water supply seemed to become self‐sufficient in photoassimilates earlier than the current needles of the control trees.
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Claims 9
Claim · model-written summary
One- and two-year-old needles accumulated 14 C in spring.
- Taxon
- Scots Pine
Pinus sylvestrist0 - Organ / stage
- 1‐year‐old and 2‐year‐old needlese0
- Outcome
- accumulated 14 Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Scots Pine Trees (Pinus silvestris)”
e0“In the spring, 1‐year‐old and 2‐year‐old needles accumulated 14 C.”
Claim · model-written summary
Accumulated reserves and current photosynthate were used when tree growth began.
- Taxon
- Scots PinePinus sylvestrist0
- Outcome
- reserves, together with current photosynthate, were utilizede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Scots Pine Trees (Pinus silvestris)”
e0“These reserves, together with current photosynthate, were utilized when the trees started growing.”
Claim · model-written summary
One-year-old needles exported 14 C to current needles in the first weeks of elongation.
- Taxon
- Scots PinePinus sylvestrist0
- Organ / stage
- 1‐year‐old needlese0
- Outcome
- exported 14 C to the current needlese0
- Qualifier
- first weeks of elongatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Scots Pine Trees (Pinus silvestris)”
e0“The 1‐year‐old needles exported 14 C to the current needles during the first weeks of elongation of the later”
Claim · model-written summary
Two-year-old needles did not export 14 C to current needles under the usual pattern.
- Taxon
- Scots PinePinus sylvestrist0
- Organ / stage
- 2‐year‐old needlese0
- Outcome
- no such translocation occurrede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Scots Pine Trees (Pinus silvestris)”
e0“while no such translocation occurred from the 2‐year‐old needles.”
Claim · model-written summary
Removing one-year-old needles caused assimilate transfer from two-year-old to current needles.
- Taxon
- Scots PinePinus sylvestrist0
- Treatment
- Removal of the 1‐year‐old needlese0
- Outcome
- translocation of assimilates from the 2‐year‐old needles to the current needlese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Scots Pine Trees (Pinus silvestris)”
e0“Removal of the 1‐year‐old needles resulted in translocation of assimilates from the 2‐year‐old needles to the current needles.”
Claim · model-written summary
Fertilization and irrigation did not change the general translocation pattern.
- Taxon
- Scots PinePinus sylvestrist0
- Treatment
- fertilized and irrigatede0
- Outcome
- general pattern of translocatione0
- Direction
- not changede0
- Comparator
- control treese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Scots Pine Trees (Pinus silvestris)”
e0“The general pattern of translocation observed in the control trees was not changed when the trees were fertilized and irrigated.”
Claim · model-written summary
New needles began exporting assimilates in mid-July when their photosynthetic rate matched older needles.
- Taxon
- Scots PinePinus sylvestrist0
- Organ / stage
- new needlese0
- Outcome
- started to export assimilatese0
- Qualifier
- middle of Julye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Scots Pine Trees (Pinus silvestris)”
e0“The new needles started to export assimilates in the middle of July when the photosynthetic rate per needle was comparable with that of the older age‐classes.”
Claim · model-written summary
Current shoots first achieved positive net photosynthesis about four weeks before new needles began export.
- Taxon
- Scots PinePinus sylvestrist0
- Organ / stage
- current shoote0
- Outcome
- positive net photosynthesis was first measurede0
- Value
- 4 weekse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Scots Pine Trees (Pinus silvestris)”
e0“This occurred about 4 weeks after positive net photosynthesis was first measured for the current shoot.”
Claim · model-written summary
Good nutrient and water supply appeared to advance current-needle photosynthate self-sufficiency.
- Taxon
- Scots PinePinus sylvestrist0
- Treatment
- good nutrient and water supplye0
- Outcome
- self‐sufficient in photoassimilatese0
- Direction
- earliere0
- Comparator
- control treese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Scots Pine Trees (Pinus silvestris)”
e0“The current needles of trees with good nutrient and water supply seemed to become self‐sufficient in photoassimilates earlier than the current needles of the control trees.”
The same questions in other papers
fertilization · nutrient: content · Pinus sylvestris (Scots pine)Positive and negative results
1 paper in the same direction as this paper · 6 in the opposite direction
- positive
- positive
- positive
4 papers more in this group
See all 8 papers →irrigation · nutrient: content · Pinus sylvestris (Scots pine)Results agree
1 paper in the same direction as this paper
- negative
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.