Sieve element occlusion provides resistance against Aphis gossypii in TGR-1551 melons

Insect Science
Hsuan-Chieh Peng, G P Walker

Abstract

Feeding behavior and plant response to feeding were studied for the aphid Aphis gossypii Glover on susceptible and resistant melons (cv. Iroquois and TGR-1551, respectively). Average phloem phase bout duration on TGR-1551 was <7% of the duration on Iroquois. Sixty-seven percent of aphids on TGR-1551 never produced a phloem phase that attained ingestion (EPG waveform E2) in contrast to only 7% of aphids on Iroquois. Average bout duration of waveform E2 (scored as zero if phloem phase did not attain E2) on TGR-1551 was <3% of the duration on Iroquois. Conversely, average bout duration of EPG waveform E1 (sieve element salivation) was 2.8 times greater on TGR-1551 than on Iroquois. In a second experiment, liquid nitrogen was used to rapidly cryofix leaves and aphids within a few minutes after the aphids penetrated a sieve element. Phloem near the penetration site was then examined by confocal laser scanning microscopy. Ninety-six percent of penetrated sieve elements were occluded by protein in TGR-1551 in contrast to only 28% in Iroquois. Usually in TGR-1551, occlusion was also observed in nearby nonpenetrated sieve elements. Next, a calcium channel blocker, trivalent lanthanum, was used to prevent phloem occlusion in TGR-1551, an...Continue Reading

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Citations

Jan 8, 2020·Horticulture Research·Mengjing SunBen Vosman
Jan 1, 2021·Horticulture Research·Mengjing SunBen Vosman
Aug 25, 2020·Molecular Plant·Weijie HuangGitta Coaker
Apr 11, 2021·Plant, Cell & Environment·Karen J KlothMarcel Dicke
Sep 4, 2021·Pest Management Science·Wikum H JayasingheMidatharahally N Maruthi

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Methods Mentioned

BETA
confocal microscopy
dissection
transmission electron microscopy

Software Mentioned

Windaq

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