Abstract
Girdling has been suggested as a way to improve earliness and intensity of flowering in mango (Mangifer indica L.). However, the accumulation of carbohydrates associated with girdling may result in a decrease in photosynthesis. We assessed the long-term effect of branch girdling during the prefloral period on leaf net photosynthesis (A(n)) of 3-year old mango trees, cv. Cogshall, growing on La Réunion island. Leaf gas exchange and chlorophyll fluorescence parameters were measured monthly from March to August 2004 on recently matured leaves on girdled and non-girdled branches. Within 28 days after girdling, A(n) was reduced by 77% and remained at about 2 micromol CO(2) m(-2 ) s(-1) until the beginning of flowering. The decrease in photosynthetic electron transport rate (J) and sustained photoprotection (reflected by the decrease in predawn maximal efficiency of photosystem II) effectively protected leaves on girdled branches from photodamage, as shown by the vigorous recovery of A(n) and J observed immediately after the appearance of inflorescences. These increases in A(n) and J were unaccompanied by a decrease in leaf carbohydrate concentration during the first month following the onset of flowering, indicating that there are carbohydrate-dependent and carbohydrate-independent mechanisms of sink regulation of photosynthesis. It is concluded that girdling does not necessarily lead to irreversible damage, even in the presence of a fourfold increase in leaf starch concentration and in the absence of any sink activity. However, the decrease in leaf nitrogen concentration indicates that there may exist long-term negative effects of branch girdling on photosynthetic capacity. A modified version of the biochemical model of A(n) is presented that takes account of the effect of leaf starch concentration on J.
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Claims 11
Claim · model-written summary
Within 28 days of girdling, leaf net photosynthesis fell 77% and stayed near 2 micromol CO(2) m(-2 ) s(-1) until flowering.
- Taxon
- mango
_from_India.jpg?width=60)
Mangifera indicat0 - Treatment
- girdlinge0
- Outcome
- A(n)e0
- Direction
- reducede0
- Value
- 77%e0
- Qualifier
- until the beginning of floweringe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_from_India.jpg?width=500)
Verbatim
e0“Within 28 days after girdling, A(n) was reduced by 77% and remained at about 2 micromol CO(2) m(-2 ) s(-1) until the beginning of flowering.”
t0“mango”
Claim · model-written summary
Girdling reduced photosynthetic electron transport rate.
- Taxon
- mangoMangifera indicat0
- Treatment
- girdled branchese0
- Outcome
- photosynthetic electron transport rate (J)e0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decrease in photosynthetic electron transport rate (J) and sustained photoprotection (reflected by the decrease in predawn maximal efficiency of photosystem II) effectively protected leaves on girdled branches from photodamage”
t0“mango”
Claim · model-written summary
Girdled leaves had decreased predawn maximal photosystem II efficiency and sustained photoprotection.
- Taxon
- mangoMangifera indicat0
- Treatment
- girdled branchese0
- Outcome
- predawn maximal efficiency of photosystem IIe0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sustained photoprotection (reflected by the decrease in predawn maximal efficiency of photosystem II) effectively protected leaves on girdled branches from photodamage”
t0“mango”
Claim · model-written summary
Net photosynthesis recovered vigorously after inflorescences appeared.
- Taxon
- mangoMangifera indicat0
- Outcome
- A(n)e0
- Direction
- recoverye0
- Qualifier
- immediately after the appearance of inflorescencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“vigorous recovery of A(n) and J observed immediately after the appearance of inflorescences.”
t0“mango”
Claim · model-written summary
Electron transport recovered vigorously after inflorescences appeared.
- Taxon
- mangoMangifera indicat0
- Outcome
- Je0
- Direction
- recoverye0
- Qualifier
- immediately after the appearance of inflorescencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“vigorous recovery of A(n) and J observed immediately after the appearance of inflorescences.”
t0“mango”
Claim · model-written summary
Leaf carbohydrate concentration did not decrease during the first month after flowering onset despite recovery of photosynthesis.
- Taxon
- mangoMangifera indicat0
- Outcome
- leaf carbohydrate concentratione0
- Direction
- unaccompanied by a decreasee0
- Qualifier
- during the first month following the onset of floweringe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These increases in A(n) and J were unaccompanied by a decrease in leaf carbohydrate concentration during the first month following the onset of flowering”
t0“mango”
Claim · model-written summary
The authors inferred both carbohydrate dependent and independent regulation of photosynthesis by sinks.
- Taxon
- mangoMangifera indicat0
- Outcome
- regulation of photosynthesise0
- Qualifier
- carbohydrate-dependent and carbohydrate-independent mechanismse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“indicating that there are carbohydrate-dependent and carbohydrate-independent mechanisms of sink regulation of photosynthesis.”
t0“mango”
Claim · model-written summary
Girdling did not necessarily cause irreversible damage despite a fourfold rise in leaf starch and absent sink activity.
- Taxon
- mangoMangifera indicat0
- Treatment
- girdlinge0
- Outcome
- irreversible damagee0
- Qualifier
- fourfold increase in leaf starch concentratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“girdling does not necessarily lead to irreversible damage, even in the presence of a fourfold increase in leaf starch concentration and in the absence of any sink activity.”
t0“mango”
Claim · model-written summary
Leaf starch concentration rose fourfold with girdling.
- Taxon
- mangoMangifera indicat0
- Treatment
- girdlingt1
- Outcome
- leaf starch concentratione0
- Direction
- increasee0
- Value
- fourfolde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fourfold increase in leaf starch concentration”
t0“mango”
t1“Girdling”
Claim · model-written summary
Leaf nitrogen concentration decreased after branch girdling, suggesting possible long term negative effects on photosynthetic capacity.
- Taxon
- mangoMangifera indicat0
- Treatment
- branch girdlinge0
- Outcome
- leaf nitrogen concentratione0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the decrease in leaf nitrogen concentration indicates that there may exist long-term negative effects of branch girdling on photosynthetic capacity.”
t0“mango”
Claim · model-written summary
The authors presented a modified photosynthesis model accounting for leaf starch effects on electron transport.
- Taxon
- mangoMangifera indicat0
- Outcome
- biochemical model of A(n)e0
- Qualifier
- effect of leaf starch concentration on Je0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A modified version of the biochemical model of A(n) is presented that takes account of the effect of leaf starch concentration on J.”
t0“mango”
The same questions in other papers
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1 paper more in this group
See all 5 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.