Abstract：
:Since the mid 1990s, Phytophthora ramorum has been responsible for the widespread mortality of tanoaks, as well as several oak species throughout California and Oregon forests. However, not all trees die, even in areas with high disease pressure, suggesting that some trees may be resistant to the pathogen. In this study, the chemical basis of host resistance was investigated. Three field experiments were carried out in California between December 2004 and September 2005. The levels of nine phenolic compounds (gallic acid, catechin, tyrosol, a tyrosol derivative, ellagic acid, and four ellagic acid derivatives) extracted from the phloem of trees that had been either artificially inoculated with P. ramorum or trees putatively infected with P. ramorum (based on canker symptoms) were quantified by high-performance liquid chromatography (HPLC). Significant differences in phenolic profiles were found between phloem sampled from the active margins of cankers, healthy phloem from asymptomatic trees, and phloem sampled 60 cm away from canker sites, although the magnitude and direction of the responses was not consistent across all experiments. Concentrations of gallic acid, tyrosol, and ellagic acid showed the greatest differences in these different tissues, but varied considerably across treatments. Gallic acid and tyrosol were tested in in vitro bioassays and showed strong dose-dependent inhibitory effects against P. ramorum, P. cinnamomi, P. citricola, and P. citrophthora. These results suggest that phloem chemistry varies in response to pathogen infection in California coast live oak populations and that changes in phloem chemistry may be related to apparently resistant phenotypes observed in the field.
journal_name
J Chem Ecoljournal_title
Journal of chemical ecologyauthors
Ockels FS,Eyles A,McPherson BA,Wood DL,Bonello Pdoi
10.1007/s10886-007-9332-zsubject
Has Abstractpub_date
2007-09-01 00:00:00pages
1721-32issue
9eissn
0098-0331issn
1573-1561journal_volume
33pub_type
杂志文章abstract：:Chemical mimicry is an effective strategy when signal receivers recognize and discriminate models by relying on chemical cues. Some aphid enemies mimic the cuticular chemicals of aphids through various means thus avoiding detection and attack by aphid-tending ants. However, because ants have been reported to learn the...
journal_title：Journal of chemical ecology
pub_type： 杂志文章
doi：10.1007/s10886-016-0676-0
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abstract：:We analyzed phenolic compounds and other elements in leaf extracts and compared morphology of three species of the Phytolaccaceae family found in South Korea. To test allelochemical effects of the three Phytolacca species, we also examined seed germination and dry weight of seedlings of Lactuca indica and Sonchus oler...
journal_title：Journal of chemical ecology
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journal_title：Journal of chemical ecology
pub_type： 杂志文章
doi：10.1007/BF01012274
更新日期：1989-06-01 00:00:00
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journal_title：Journal of chemical ecology
pub_type： 杂志文章
doi：10.1007/s10886-005-9320-0
更新日期：2005-12-01 00:00:00
abstract：:Males of the cerambycid beetle Xylotrechus pyrrhoderus release a mixture of (S)-2-hydroxy-3-octanone [(S)-1] and (2S,3S)-2,3-octanediol [(2S,3S)-2] as a sex pheromone that attracts conspecific females. The chemical structures of these pheromone components include a common motif and are assumed to be biosynthetically r...
journal_title：Journal of chemical ecology
pub_type： 杂志文章
doi：10.1007/s10886-014-0508-z
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journal_title：Journal of chemical ecology
pub_type： 杂志文章
doi：10.1007/BF01207442
更新日期：1989-07-01 00:00:00
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journal_title：Journal of chemical ecology
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doi：10.1007/s10886-017-0867-3
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journal_title：Journal of chemical ecology
pub_type： 杂志文章
doi：10.1007/s10886-015-0588-4
更新日期：2015-06-01 00:00:00
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doi：10.1007/s10886-017-0821-4
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journal_title：Journal of chemical ecology
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更新日期：2021-02-01 00:00:00
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journal_title：Journal of chemical ecology
pub_type： 杂志文章
doi：10.1007/BF02033643
更新日期：1996-03-01 00:00:00
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journal_title：Journal of chemical ecology
pub_type： 杂志文章
doi：10.1007/BF00987470
更新日期：1993-01-01 00:00:00
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journal_title：Journal of chemical ecology
pub_type： 杂志文章
doi：10.1023/b:joec.0000037750.64844.4b
更新日期：2004-07-01 00:00:00
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journal_title：Journal of chemical ecology
pub_type： 杂志文章
doi：10.1007/s10886-014-0449-6
更新日期：2014-07-01 00:00:00
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journal_title：Journal of chemical ecology
pub_type： 杂志文章
doi：10.1007/BF02098404
更新日期：1994-11-01 00:00:00
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journal_title：Journal of chemical ecology
pub_type： 杂志文章
doi：10.1007/s10886-007-9377-z
更新日期：2007-11-01 00:00:00
abstract：:Phorodon humuli (Damson-hop aphid) is one of the major pests of hops in the northern hemisphere. It causes significant yield losses and reduces hop quality and economic value. Damson-hop aphid is currently controlled with insecticides, but the number of approved pesticides is steadily decreasing. In addition, the use ...
journal_title：Journal of chemical ecology
pub_type： 杂志文章
doi：10.1007/s10886-018-0980-y
更新日期：2018-08-01 00:00:00
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journal_title：Journal of chemical ecology
pub_type： 杂志文章
doi：10.1023/a:1012242904220
更新日期：2001-10-01 00:00:00
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journal_title：Journal of chemical ecology
pub_type： 杂志文章
doi：10.1007/BF01020566
更新日期：1986-02-01 00:00:00
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journal_title：Journal of chemical ecology
pub_type： 杂志文章
doi：10.1007/BF01012421
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journal_title：Journal of chemical ecology
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doi：10.1007/BF00994614
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journal_title：Journal of chemical ecology
pub_type： 杂志文章
doi：10.1007/BF00988424
更新日期：1984-11-01 00:00:00
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journal_title：Journal of chemical ecology
pub_type： 杂志文章
doi：10.1007/BF02033714
更新日期：1994-12-01 00:00:00
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journal_title：Journal of chemical ecology
pub_type： 杂志文章
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更新日期：1992-09-01 00:00:00
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journal_title：Journal of chemical ecology
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journal_title：Journal of chemical ecology
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更新日期：2008-05-01 00:00:00
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journal_title：Journal of chemical ecology
pub_type： 杂志文章
doi：10.1007/s10886-007-9330-1
更新日期：2007-08-01 00:00:00
abstract：:Effects of 2-beta-D-glucopyranosyloxy-4-hydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA-Glc) and DIMBOA-Glc N-O-methylated (HDMBOA-Glc), two compounds present in high concentration in maize, were tested on the aphid Metopolophium dirhodum reared on artificial diet. HDMBOA-Glc and DIMBOA-Glc decrease survival of adults ...
journal_title：Journal of chemical ecology
pub_type： 杂志文章
doi：10.1023/a:1005636607138
更新日期：2001-02-01 00:00:00
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journal_title：Journal of chemical ecology
pub_type： 杂志文章
doi：10.1007/BF00992377
更新日期：1981-09-01 00:00:00
