Abstract
The woolly poplar aphid, Phloeomyzus passerinii (Signoret) (Hemiptera: Aphididae), is a major pest of poplar plantations in the Mediterranean basin and the Near East. Aphids colonize poplar trunks and feed upon the cortical parenchyma. Despite the economic importance of poplar, little is known about the mechanisms involved in poplar resistance to this pest. However, Populus x canadensis Moench genotypes show various levels of resistance to P. passerinii. This study has investigated the type of poplar resistance (antibiosis or antixenosis) by assessing aphid settlement, physiology (survival, development, and reproduction), and stylet penetration behavior (electrical penetration graph) on three P. x canadensis genotypes; '1214' (susceptible), 'Brenta' (resistant), and '145/51' (intermediate). Because settlement was reduced, the highly resistant genotype Brenta exhibited surface antixenosis. In addition, nymphal survival was null on Brenta, and twice less adult aphid initiated a sustained intracellular phase in the cortical parenchyma of that genotype compared with the other two genotypes. Thus, Brenta also showed parenchyma-located antixenosis coupled with antibiosis characteristic. In contrast, P. passerinii had no difficulty to initiate a sustained ingestion in the cortical parenchyma of the intermediate genotype 145/51, but decreased fecundity and lower intrinsic rate of natural increase were clear expressions of antibiosis.
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Claims 7
Claim · model-written summary
Aphid settlement was reduced on Brenta, indicating surface antixenosis.
- Material
- Brentae0
- Interactor
- P. passeriniiPhloeomyzus passeriniie1pest
- Outcome
- settlemente0
- Direction
- reducede0
PopulusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Poplar Genotypes”
e0“Because settlement was reduced, the highly resistant genotype Brenta exhibited surface antixenosis.”
e1“However, Populus x canadensis Moench genotypes show various levels of resistance to P. passerinii.”
Claim · model-written summary
Aphid nymphal survival was zero on Brenta.
- Material
- Brentae0
- Interactor
- P. passeriniiPhloeomyzus passeriniie1pest
- Outcome
- nymphal survivale0
- Direction
- nulle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Poplar Genotypes”
e0“In addition, nymphal survival was null on Brenta, and twice less adult aphid initiated a sustained intracellular phase in the cortical parenchyma of that genotype compared with the other two genotypes.”
e1“However, Populus x canadensis Moench genotypes show various levels of resistance to P. passerinii.”
Claim · model-written summary
On Brenta, half as many adult aphids initiated a sustained intracellular phase as on the other two genotypes.
- Material
- Brentae0
- Interactor
- P. passeriniiPhloeomyzus passeriniie1pest
- Outcome
- adult aphid initiated a sustained intracellular phasee0
- Direction
- twice lesse0
- Comparator
- other two genotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Poplar Genotypes”
e0“In addition, nymphal survival was null on Brenta, and twice less adult aphid initiated a sustained intracellular phase in the cortical parenchyma of that genotype compared with the other two genotypes.”
e1“However, Populus x canadensis Moench genotypes show various levels of resistance to P. passerinii.”
Claim · model-written summary
Brenta showed parenchyma antixenosis and antibiosis.
- Material
- Brentae0
- Interactor
- P. passeriniiPhloeomyzus passeriniie1pest
- Outcome
- parenchyma-located antixenosis coupled with antibiosis characteristice0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Poplar Genotypes”
e0“Thus, Brenta also showed parenchyma-located antixenosis coupled with antibiosis characteristic.”
e1“However, Populus x canadensis Moench genotypes show various levels of resistance to P. passerinii.”
Claim · model-written summary
P. passerinii initiated sustained ingestion in the cortical parenchyma of genotype 145/51.
- Material
- 145/51e0
- Interactor
- P. passeriniiPhloeomyzus passeriniie1pest
- Outcome
- P. passerinii had no difficulty to initiate a sustained ingestione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Poplar Genotypes”
e0“In contrast, P. passerinii had no difficulty to initiate a sustained ingestion in the cortical parenchyma of the intermediate genotype 145/51, but decreased fecundity and lower intrinsic rate of natural increase were clear expressions of antibiosis.”
e1“However, Populus x canadensis Moench genotypes show various levels of resistance to P. passerinii.”
Claim · model-written summary
Aphid fecundity decreased on genotype 145/51.
- Material
- 145/51e0
- Interactor
- P. passeriniiPhloeomyzus passeriniie1pest
- Outcome
- fecunditye0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Poplar Genotypes”
e0“In contrast, P. passerinii had no difficulty to initiate a sustained ingestion in the cortical parenchyma of the intermediate genotype 145/51, but decreased fecundity and lower intrinsic rate of natural increase were clear expressions of antibiosis.”
e1“However, Populus x canadensis Moench genotypes show various levels of resistance to P. passerinii.”
Claim · model-written summary
Aphid intrinsic rate of natural increase was lower on genotype 145/51.
- Material
- 145/51e0
- Interactor
- P. passeriniiPhloeomyzus passeriniie1pest
- Outcome
- intrinsic rate of natural increasee0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Poplar Genotypes”
e0“In contrast, P. passerinii had no difficulty to initiate a sustained ingestion in the cortical parenchyma of the intermediate genotype 145/51, but decreased fecundity and lower intrinsic rate of natural increase were clear expressions of antibiosis.”
e1“However, Populus x canadensis Moench genotypes show various levels of resistance to P. passerinii.”