Abstract
The retranslocation of copper and nitrogen was studied in four cultivars of wheat grown in pots of a copper-deficient sand from Lancelin, W.A. Plants were grown at two levels of nitrogen and three levels of copper, and harvested three times during growth and at maturity. Plants grown at low copper were severely copper-deficient and yielded no grain. At low nitrogen, plants at marginal copper gave similar grain yields to plants at high copper. Application of high nitrogen at marginal copper either had little effect or depressed grain yield. Application of high nitrogen at high copper gave a strong positive interaction producing maximal grain yield in each cultivar. Low copper supply delayed yellowing and the decline in copper and nitrogen content of the oldest leaf of each cultivar. Application of high nitrogen further delayed yellowing of the oldest leaf and loss of its copper and nitrogen. Probably the copper content of the oldest leaf does not decline until the leaf begins to senesce. Senesced leaves retain low concentrations of copper and nitrogen. It is suggested that at marginal copper, copper retention by senesced vegetation limits the retranslocation of copper from vegetation to grain. Susceptibility to copper deficiency differed markedly with stage of growth and with cultivar. At marginal copper and high nitrogen, copper deficiency almost eliminated the grain yield of Argentine IX, but had relatively small effects on Gamenya, Olympic, and Petit Rojo. The higher susceptibility of grain production in Argentine IX to copper deficiency was not related to its copper content in whole tops or to its grain protein concentration. The susceptibility may have resulted from the ability of this cultivar to form large numbers of tillers which competed with the developing grain for retranslocated copper.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 13
Claim · model-written summary
Low copper prevented grain yield.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- low coppere0
- Outcome
- yielded no graine0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat”
e0“Plants grown at low copper were severely copper-deficient and yielded no grain.”
Claim · model-written summary
At low nitrogen, marginal and high copper gave similar grain yield.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- marginal coppere0
- Outcome
- grain yieldse0
- Direction
- similare0
- Qualifier
- low nitrogene0
- Comparator
- high coppere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat”
e0“At low nitrogen, plants at marginal copper gave similar grain yields to plants at high copper.”
Claim · model-written summary
High nitrogen at marginal copper had little or negative effect on grain yield.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- high nitrogen at marginal coppere0
- Outcome
- grain yielde0
- Direction
- depressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat”
e0“Application of high nitrogen at marginal copper either had little effect or depressed grain yield.”
Claim · model-written summary
High nitrogen and high copper produced maximal grain yield in each cultivar.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- high nitrogen at high coppere0
- Outcome
- grain yielde0
- Direction
- maximale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat”
e0“Application of high nitrogen at high copper gave a strong positive interaction producing maximal grain yield in each cultivar.”
Claim · model-written summary
Low copper delayed yellowing of the oldest leaf.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- oldest leafe0
- Treatment
- Low copper supplye0
- Outcome
- yellowinge0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat”
e0“Low copper supply delayed yellowing and the decline in copper and nitrogen content of the oldest leaf of each cultivar.”
Claim · model-written summary
Low copper delayed the fall in leaf copper and nitrogen.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- oldest leafe0
- Treatment
- Low copper supplye0
- Outcome
- decline in copper and nitrogen contente0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat”
e0“Low copper supply delayed yellowing and the decline in copper and nitrogen content of the oldest leaf of each cultivar.”
Claim · model-written summary
High nitrogen further delayed yellowing and loss of copper and nitrogen in the oldest leaf.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- high nitrogene0
- Outcome
- yellowing of the oldest leaf and loss of its copper and nitrogene0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat”
e0“Application of high nitrogen further delayed yellowing of the oldest leaf and loss of its copper and nitrogen.”
Claim · model-written summary
Senesced leaves retained low copper and nitrogen.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- Senesced leavese0
- Outcome
- low concentrations of copper and nitrogene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat”
e0“Senesced leaves retain low concentrations of copper and nitrogen.”
Claim · model-written summary
Copper deficiency susceptibility varied by growth stage and cultivar.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- stage of growthe0
- Outcome
- Susceptibility to copper deficiencye0
- Direction
- differed markedlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat”
e0“Susceptibility to copper deficiency differed markedly with stage of growth and with cultivar.”
Claim · model-written summary
At marginal copper and high nitrogen, copper deficiency almost eliminated Argentine IX grain yield.
- Taxon
- wheatTriticum aestivumt0
- Material
- Argentine IXe0
- Treatment
- copper deficiencye0
- Outcome
- grain yielde0
- Direction
- almost eliminatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat”
e0“At marginal copper and high nitrogen, copper deficiency almost eliminated the grain yield of Argentine IX”
Claim · model-written summary
Copper deficiency had relatively small grain yield effects in Gamenya, Olympic, and Petit Rojo.
- Taxon
- wheatTriticum aestivumt0
- Material
- Gamenya, Olympic, and Petit Rojoe0
- Outcome
- relatively small effectse0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat”
e0“but had relatively small effects on Gamenya, Olympic, and Petit Rojo.”
Claim · model-written summary
Argentine IX susceptibility was unrelated to copper content in whole tops.
- Taxon
- wheatTriticum aestivumt0
- Material
- Argentine IXe0
- Compound
- copper contente0
- Outcome
- susceptibility of grain productione0
- Direction
- not relatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat”
e0“The higher susceptibility of grain production in Argentine IX to copper deficiency was not related to its copper content in whole tops”
Claim · model-written summary
Senesced vegetation may retain copper that would otherwise be retranslocated to grain.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- retranslocation of copper from vegetation to graine0
- Qualifier
- copper retention by senesced vegetatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat”
e0“It is suggested that at marginal copper, copper retention by senesced vegetation limits the retranslocation of copper from vegetation to grain.”
The same questions in other papers
copper atom · nutrient: content · Triticum aestivum (wheat)Results differ
23 papers in the same direction as this paper · 12 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- negative
- negative
32 papers more in this group
See all 36 papers →copper atom · yield · Triticum aestivum (wheat)Results differ
62 papers in the same direction as this paper · 12 in the opposite direction
- positive
- positive
- positive
71 papers more in this group
See all 75 papers →copper atom · disease · Triticum aestivum (wheat)Positive and negative results
10 papers in the same direction as this paper · 5 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- negative
- negative
12 papers more in this group
See all 16 papers →nitrogen · disease · Triticum aestivum (wheat)Results differ
28 papers in the same direction as this paper · 23 in the opposite direction
- positive
- positive
- positive
48 papers more in this group
See all 52 papers →nitrogen · yield · Triticum aestivum (wheat)Positive and negative results
1,736 papers in the same direction as this paper · 285 in the opposite direction · 39 reporting no difference from an alternative
- negative
- negative
- negative
2,057 papers more in this group
See all 2,061 papers →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.