Abstract
Measurements of net photosynthetic rate (at 1450 ,μmol m -2 S -l photosynthetically active radiation) ofleaves, ofleaf and stem respiration, and of shoot growth of potentially-fruiting laterals on kiwifruit ( Actinidia deliciosa ) were used to estimate weekly shoot carbon balances over the first 10 weeks of shoot growth (budburst to anthesis). Consistent differences in the rate of shoot elongation, of internode expansion and of increase in basal diameter were found among shoots. Faster-growing (long) shoots acquired carbon by photosynthesis at a faster rate even in the first few weeks after bud burst, but the amount of carbon required to sustain this growth resulted in shoot carbon deficits which were approx. seven times greater than those of the slower-growing (short) shoots. It was estimated that the transition from shoot carbon deficit to carbon surplus occurred 3–4 weeks after bud burst, irrespective of shoot growth rate. As a result of subsequent rapid increases in shoot photosynthetic rate, long shoots had a shoot carbon surplus of 4·4 g C week -l in the week before anthesis, approx. three times that of the short shoots. Defoliation (66%) of shoots 1 week after bud burst, and subsequent removal of later-emerging leaves to maintain the level of defoliation. had the effect of slowing shoot growth in the carbon deficit period, particularly for the long shoots. However, the duration of shoot expansion in the defoliated shoots was longer, resulting ultimately in shoots which were longer than the control shoots. Linkages among early carbon balance dynamics of shoots, shoot length at anthesis, and fruit growth are discussed.
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 7
Claim · model-written summary
Kiwifruit shoots differed consistently in elongation, internode expansion and basal diameter increase.
- Taxon
- Kiwifruit
Actinidia deliciosat0 - Outcome
- shoot elongation, of internode expansion and of increase in basal diametere0
- Direction
- differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Consistent differences in the rate of shoot elongation, of internode expansion and of increase in basal diameter were found among shoots.”
t0“Kiwifruit Shoots”
Claim · model-written summary
Long, faster-growing kiwifruit shoots acquired carbon by photosynthesis faster early after bud burst.
- Taxon
- KiwifruitActinidia deliciosat0
- Material
- Faster-growing (long) shootse0
- Organ / stage
- bud burste0
- Outcome
- carbon by photosynthesise0
- Direction
- faster ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Faster-growing (long) shoots acquired carbon by photosynthesis at a faster rate even in the first few weeks after bud burst”
t0“Kiwifruit Shoots”
Claim · model-written summary
Long kiwifruit shoots had carbon deficits about seven times greater than short shoots.
- Taxon
- KiwifruitActinidia deliciosat0
- Outcome
- shoot carbon deficitse0
- Direction
- greatere0
- Value
- approx. seven timese0
- Comparator
- slower-growing (short) shootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shoot carbon deficits which were approx. seven times greater than those of the slower-growing (short) shoots.”
t0“Kiwifruit Shoots”
Claim · model-written summary
Kiwifruit shoot carbon balance shifted from deficit to surplus 3–4 weeks after bud burst regardless of shoot growth rate.
- Taxon
- KiwifruitActinidia deliciosat0
- Outcome
- transition from shoot carbon deficit to carbon surpluse0
- Value
- 3–4 weekse0
- Qualifier
- irrespective of shoot growth ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the transition from shoot carbon deficit to carbon surplus occurred 3–4 weeks after bud burst, irrespective of shoot growth rate.”
t0“Kiwifruit Shoots”
Claim · model-written summary
Before anthesis, long kiwifruit shoots had a 4·4 g C week -l surplus, about three times that of short shoots.
- Taxon
- KiwifruitActinidia deliciosat0
- Organ / stage
- anthesise0
- Outcome
- shoot carbon surpluse0
- Value
- 4·4 g C week -le0
- Comparator
- short shootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“long shoots had a shoot carbon surplus of 4·4 g C week -l in the week before anthesis, approx. three times that of the short shoots.”
t0“Kiwifruit Shoots”
Claim · model-written summary
Defoliation slowed kiwifruit shoot growth during the carbon deficit period, especially in long shoots.
- Taxon
- KiwifruitActinidia deliciosat0
- Treatment
- Defoliation (66%)e0
- Outcome
- shoot growthe0
- Direction
- slowinge0
- Qualifier
- particularly for the long shootse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Defoliation (66%) of shoots 1 week after bud burst, and subsequent removal of later-emerging leaves to maintain the level of defoliation. had the effect of slowing shoot growth in the carbon deficit period, particularly for the long shoots.”
t0“Kiwifruit Shoots”
Claim · model-written summary
Defoliated kiwifruit shoots expanded for longer and ended longer than control shoots.
- Taxon
- KiwifruitActinidia deliciosat0
- Treatment
- defoliated shootse0
- Outcome
- duration of shoot expansione0
- Direction
- longere0
- Comparator
- control shootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the duration of shoot expansion in the defoliated shoots was longer, resulting ultimately in shoots which were longer than the control shoots.”
t0“Kiwifruit Shoots”
The same questions in other papers
pruning · growth · Actinidia deliciosa (kiwifruit)Positive and negative results
4 papers in the same direction as this paper · 11 in the opposite direction
- positive
- negative
- positive
12 papers more in this group
See all 16 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.