Abstract
Silverleaf whitefly (SLW), Bemisia argentifolii Bellows and Perring, is one of the most noxious pests of numerous field and vegetable crops, causing billions of dollars worth of damage throughout the world. SLW is a phloem feeder whose feeding is likely to interfere with phloem transport. The aim of this study was to test the hypothesis that SLW infestation impairs carbohydrate export from source leaves, and consequently increases their carbohydrate content. The youngest fully expanded leaves of cotton ( Gossypium hirsutum L., cv. Siv'on), grown under SLW‐infested and noninfested conditions, were characterized for their diurnal changes in carbohydrate content and photoassimilate export. SLW infestation induced a considerable reduction in net photosynthetic rate (P n ), coupled with increased sucrose, glucose and fructose and decreased starch concentrations. Export rate was determined after CO 2 pulse‐labeling both by in situ monitoring of leaf radioactivity and by analyzing the content and radioactivity of the major carbon metabolites. Radioactive counting indicated a lower rate of C efflux for the infested plants. A similar trend was found for the specific activities of sucrose and the three soluble sugars combined (sucrose, glucose and fructose). A single exponential decay function with asymptote was fitted to the above efflux curves. All the calculated exponential coefficients demonstrated lower export rates after SLW injury. These results indicate that SLW impairs photoassimilate export, suggesting possible down‐regulation of P n due to increased foliar soluble sugar contents.
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Claims 5
Claim · model-written summary
SLW infestation reduced the net photosynthetic rate of cotton leaves compared with noninfested plants.
- Taxon
- cotton
Gossypium hirsutumt0 - Treatment
- SLW infestatione1
- Interactor
- SLWe1pest
- Outcome
- net photosynthetic ratee1
- Direction
- reductione1
- Comparator
- noninfestede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Silverleaf whitefly stress impairs sugar export from cotton source leaves”
e1“SLW infestation induced a considerable reduction in net photosynthetic rate”
e3“noninfested conditions”
Claim · model-written summary
SLW infestation increased sucrose, glucose and fructose contents in cotton source leaves compared with noninfested plants.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- SLW infestatione1
- Interactor
- SLWe1pest
- Outcome
- sucrose, glucose and fructosee2
- Direction
- increasede2
- Comparator
- noninfestede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Silverleaf whitefly stress impairs sugar export from cotton source leaves”
e1“SLW infestation induced a considerable reduction in net photosynthetic rate”
e2“increased sucrose, glucose and fructose”
e3“noninfested conditions”
Claim · model-written summary
SLW infestation decreased starch concentrations in cotton source leaves compared with noninfested plants.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- SLW infestatione1
- Interactor
- SLWe1pest
- Outcome
- starch concentrationse4
- Direction
- decreasede4
- Comparator
- noninfestede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Silverleaf whitefly stress impairs sugar export from cotton source leaves”
e1“SLW infestation induced a considerable reduction in net photosynthetic rate”
e3“noninfested conditions”
e4“decreased starch concentrations”
Claim · model-written summary
SLW infestation lowered the rate of C efflux from cotton source leaves, i.e. photoassimilate export, compared with noninfested plants.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- SLW infestatione1
- Interactor
- SLWe1pest
- Outcome
- rate of C effluxe5
- Direction
- lowere5
- Comparator
- noninfestede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Silverleaf whitefly stress impairs sugar export from cotton source leaves”
e1“SLW infestation induced a considerable reduction in net photosynthetic rate”
e3“noninfested conditions”
e5“Radioactive counting indicated a lower rate of C efflux for the infested plants”
Claim · model-written summary
Specific activities of sucrose and the three soluble sugars combined showed a similar trend, i.e. lower, after SLW infestation.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- SLW infestatione1
- Interactor
- SLWe1pest
- Outcome
- specific activities of sucrose and the three soluble sugars combinede6
- Direction
- lowerinferrede6
- Comparator
- noninfestede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Silverleaf whitefly stress impairs sugar export from cotton source leaves”
e1“SLW infestation induced a considerable reduction in net photosynthetic rate”
e3“noninfested conditions”
e6“A similar trend was found for the specific activities of sucrose and the three soluble sugars combined”
The same questions in other papers
Bemisia argentifolii · physiology: photosynthesis · Gossypium hirsutum (cotton)Results agree
1 paper in the same direction as this paper
- negative
infection · physiology: osmolytes · Gossypium hirsutum (cotton)Positive and negative results
1 in the opposite direction
- positive
infection · molecular: metabolites · Gossypium hirsutum (cotton)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- negative
infection · physiology: photosynthesis · Gossypium hirsutum (cotton)Positive and negative results
3 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
2 papers more in this group
See all 6 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.