In this section
@article{Kanvil:2017:10.1111/pce.13053,
author = {Kanvil, S and Pham, J and Lopez-Cobollo, R and Selby, M and Bennett, M and Beckingham, C and Powell, G and Turnbull, C},
doi = {10.1111/pce.13053},
journal = {Plant, Cell and Environment},
pages = {2780--2789},
title = {Cucurbit extrafascicular phloem has strong negative impacts on aphids and is not a preferred feeding site.},
url = {http://dx.doi.org/10.1111/pce.13053},
volume = {40},
year = {2017}
}
TY - JOUR
AB - Cucurbits have long been known to possess two types of phloem: fascicular (FP) within vascular bundles and extrafascicular phloem (EFP) surrounding vascular bundles and scattered through the cortex. Recently, their divergent composition was revealed, with FP having high sugar content consistent with conventional phloem, but EFP having much lower sugar levels and a very different proteome. However, the evolutionary advantages of possessing both FP and EFP have remained unclear. Here, we present four lines of quantitative evidence that together support the hypothesis that FP represents a typical phloem and is an attractive diet for aphids, whereas aphids avoid feeding on EFP. First, aphid stylet track endings were more abundant near the abaxial FP element of minor veins, suggesting a feeding preference for FP over EFP. Second, sugar profiles from stylet exudates were wholly consistent with FP origins, further supporting preference for FP and avoidance of EFP. Third, supplementation of EFP exudate into artificial diets confirmed an aversion to EFP in choice experiments. Finally, EFP exudate had negative effects on aphid performance. On the basis of aphids' inability to thrive on EFP, we conclude that EFP is atypical and perhaps should not be classed as a phloem system.
AU - Kanvil,S
AU - Pham,J
AU - Lopez-Cobollo,R
AU - Selby,M
AU - Bennett,M
AU - Beckingham,C
AU - Powell,G
AU - Turnbull,C
DO - 10.1111/pce.13053
EP - 2789
PY - 2017///
SN - 0140-7791
SP - 2780
TI - Cucurbit extrafascicular phloem has strong negative impacts on aphids and is not a preferred feeding site.
T2 - Plant, Cell and Environment
UR - http://dx.doi.org/10.1111/pce.13053
UR - https://www.ncbi.nlm.nih.gov/pubmed/28779505
UR - http://hdl.handle.net/10044/1/52136
VL - 40
ER -