Abstract
Photosynthetic activity is affected by environmental factors and endogenous signals controlled by the source-sink relationship. We recently showed upregulated photosynthetic rate following partial defoliation under favorable environmental conditions. Here, we examined the influence of partial defoliation on the remaining leaves' function in tomato plants under nutrient deficiency. The effect of partial defoliation was more pronounced under limited mineral supply vs. favorable conditions. Reduced source-sink ratio resulted in increased stomatal conductance and transpiration rate, as well as higher photosystem II efficiency. Although chlorophyll concentration was significantly reduced under limited nutrient supply, the photosynthetic rate in the remaining leaf was similar to that measured under normal fertilization. Expression of genes involved in the phloem loading of assimilated sugars was downregulated in the remaining source leaf of unfertilized plants, 15 d after partial defoliation; in fertilized plants, these genes' expression was similar in control and partially defoliated plants. We propose that at early stage, the additional carbon assimilated in the remaining leaf is devoted to increasing source size rather than sink growth. The size increase of the remaining leaf in unfertilized plants was not sufficient to rebalance the source-sink ratio, resulting in inhibited sugar export and further carbohydrate allocation in the remaining leaf.
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Claims 10
Claim · model-written summary
Partial defoliation had a more pronounced effect under limited mineral supply than favorable conditions.
- Taxon
- tomato plants
Solanum lycopersicumt0 - Treatment
- partial defoliatione0
- Outcome
- effect of partial defoliatione0
- Direction
- more pronouncede0
- Comparator
- favorable conditionse0
- Setting
- limited mineral supplye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of partial defoliation was more pronounced under limited mineral supply vs. favorable conditions.”
t0“tomato plants”
Claim · model-written summary
Reduced source-sink ratio increased stomatal conductance and transpiration rate.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- Reduced source-sink ratioe0
- Outcome
- stomatal conductance and transpiration ratee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduced source-sink ratio resulted in increased stomatal conductance and transpiration rate”
t0“tomato plants”
Claim · model-written summary
Reduced source-sink ratio raised photosystem II efficiency.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- Reduced source-sink ratioe0
- Outcome
- photosystem II efficiencye0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduced source-sink ratio resulted in increased stomatal conductance and transpiration rate, as well as higher photosystem II efficiency.”
t0“tomato plants”
Claim · model-written summary
Chlorophyll concentration was significantly reduced with limited nutrient supply.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- limited nutrient supplye0
- Outcome
- chlorophyll concentratione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chlorophyll concentration was significantly reduced under limited nutrient supply”
t0“tomato plants”
Claim · model-written summary
The remaining leaf had a photosynthetic rate similar to normal fertilization under limited nutrient supply.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Organ / stage
- remaining leafe0
- Treatment
- limited nutrient supplyt1
- Outcome
- photosynthetic ratee0
- Direction
- similare0
- Comparator
- normal fertilizatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the photosynthetic rate in the remaining leaf was similar to that measured under normal fertilization”
t0“tomato plants”
t1“limited nutrient supply”
Claim · model-written summary
Genes for phloem loading of assimilated sugars were downregulated in remaining source leaves of unfertilized plants 15 days after defoliation.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Organ / stage
- remaining source leafe0
- Treatment
- partial defoliatione0
- Gene
- genes involved in the phloem loading of assimilated sugarse0
- Outcome
- Expression of genes involved in the phloem loading of assimilated sugarse0
- Direction
- downregulatede0
- Qualifier
- 15 d after partial defoliatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Expression of genes involved in the phloem loading of assimilated sugars was downregulated in the remaining source leaf of unfertilized plants, 15 d after partial defoliation”
t0“tomato plants”
Claim · model-written summary
In fertilized plants, those genes had similar expression in controls and partially defoliated plants.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- partially defoliated plantse0
- Outcome
- these genes’ expressione0
- Direction
- similare0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in fertilized plants, these genes’ expression was similar in control and partially defoliated plants”
t0“tomato plants”
Claim · model-written summary
Authors propose that early extra carbon assimilation increases source size rather than sink growth.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Outcome
- increasing source size rather than sink growthe0
- Qualifier
- additional carbon assimilated in the remaining leafe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at early stage, the additional carbon assimilated in the remaining leaf is devoted to increasing source size rather than sink growth”
t0“tomato plants”
Claim · model-written summary
Leaf size increase in unfertilized plants was insufficient to rebalance the source-sink ratio.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Organ / stage
- remaining leafe0
- Outcome
- size increase of the remaining leafe0
- Qualifier
- not sufficient to rebalance the source-sink ratioe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The size increase of the remaining leaf in unfertilized plants was not sufficient to rebalance the source-sink ratio”
t0“tomato plants”
Claim · model-written summary
Insufficient source-sink rebalancing was interpreted to inhibit sugar export and further allocate carbohydrates in the remaining leaf.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Outcome
- inhibited sugar export and further carbohydrate allocation in the remaining leafe0
- Qualifier
- inhibited sugar exporte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“resulting in inhibited sugar export and further carbohydrate allocation in the remaining leaf”
t0“tomato plants”
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