Search results for: W. Freddy Tjallingii

Items from 1 to 6 out of 6 results

article

Real‐time, in vivo intracellular recordings of caterpillar‐induced depolarization waves in sieve elements using aphid electrodes

Vicenta Salvador‐Recatalà, W. Freddy Tjallingii, Edward E. Farmer

Plants propagate electrical signals in response to artificial wounding. However, little is known about the electrophysiological responses of the phloem to wounding, and whether natural damaging stimuli induce propagating electrical signals in this tissue.Here, we used living aphids and the direct current (DC) version of the electrical penetration graph (EPG) to detect changes in the membrane potential...

article

EPG waveform characteristics of solenopsis mealybug stylet penetration on cotton

Fang Huang, W. Freddy Tjallingii, Pengjun Zhang, Jinming Zhang, more

Entomologia Experimentalis et Applicata > 143 > 1 > 47 - 54

The solenopsis mealybug, Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae), is a polyphagous insect known to cause severe damage to cotton (especially transgenic varieties) in South Asia, and currently poses a serious threat in Asia and potentially elsewhere. Stylet penetration behavior of P. solenopsis on cotton was monitored using the electrical penetration graph (EPG) technique (DC system)...

article

Stylet penetration of Cacopsylla pyri; an electrical penetration graph (EPG) study

Stefano Civolani, Marilena Leis, Gilberto Grandi, Elisa Garzo, more

Journal of Insect Physiology > 2011 > 57 > 10 > 1407-1419

Detailed information on plant penetration activities by pear psylla Cacopsylla pyri L. (Hemiptera Psyllidae) is essential to study phytoplasma transmission of “Candidatus Phytoplasma pyri” responsible of pear decline disease (PD) and to trace and evaluate resistant traits in new pear tree selections for advanced breeding programs. The electrical penetration graph technique or (full) EPG may relevantly...

article

Effects of experimental stress factors on probing behaviour by aphids

Ernesto Prado, W. Freddy Tjallingii

Entomologia Experimentalis et Applicata > 1999 > 90 > 3 > 289-300

Probing behaviour of Aphis fabae Scopoli and Rhopalosiphum padi (L.) was tested in different stress situations normally occurring in aphid-plant studies such as interruption of feeding or starvation, transfer to a new plant, and attachment to the electrode wire. The DC electrical penetration graph (EPG) technique and a ‘honeydew clock’ were used to collect data on behavioural effects of these stress...

article

Phenol oxidising enzymes in the grain aphid’s saliva

Anna Urbanska, W. Freddy Tjallingii, Anthony F. G. Dixon, Bogumil Leszczynski

Entomologia Experimentalis et Applicata > 1998 > 86 > 2 > 197-203

Sucrose-agarose gels and sucrose liquid diets were used to study the phenol oxidising enzymes in the salivary secretions of the grain aphid, Sitobion avenae (Fabricius). Activity indicating the presence of two oxidoreductases, polyphenol oxidase (PPO) and peroxidase (Px), was found. Both enzymes were present in the aphid’s stylet sheath (gelling saliva) but only polyphenol oxidase activity was found...

article

Effects of previous plant infestation on sieve element acceptance by two aphids

Ernesto Prado, W. Freddy Tjallingii*

Entomologia Experimentalis et Applicata > 1997 > 82 > 2 > 189-200

Probing behaviour as affected by a previous infestation was studied in two aphid species on their respective host plants. Probing behaviour by Aphis fabae (reported to have beneficial effects when living in colonies) and Rhopalosiphum padi (without known beneficial effects) was studied using the electrical penetration graph (EPG) technique. In A. fabae the main effects were longer and more continuous...

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Search results for: W. Freddy Tjallingii

Real‐time, in vivo intracellular recordings of caterpillar‐induced depolarization waves in sieve elements using aphid electrodes

EPG waveform characteristics of solenopsis mealybug stylet penetration on cotton

Stylet penetration of Cacopsylla pyri; an electrical penetration graph (EPG) study

Effects of experimental stress factors on probing behaviour by aphids

Phenol oxidising enzymes in the grain aphid’s saliva

Effects of previous plant infestation on sieve element acceptance by two aphids

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INFONA - science communication portal

Search results for: W. Freddy Tjallingii

Real‐time, in vivo intracellular recordings of caterpillar‐induced depolarization waves in sieve elements using aphid electrodes

EPG waveform characteristics of solenopsis mealybug stylet penetration on cotton

Stylet penetration of Cacopsylla pyri; an electrical penetration graph (EPG) study

Effects of experimental stress factors on probing behaviour by aphids

Phenol oxidising enzymes in the grain aphid’s saliva

Effects of previous plant infestation on sieve element acceptance by two aphids

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