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Composition of epiphytic bacterial communities differs on petals and leaves

Junker, Robert R. and Loewel, C. and Gross, Roy and Dötterl, Stefan and Keller, A. and Blüthgen, Nico (2011):
Composition of epiphytic bacterial communities differs on petals and leaves.
In: Plant Biology, [Online-Edition: http://onlinelibrary.wiley.com/doi/10.1111/j.1438-8677.2011....],
[Article]

Abstract

The epiphytic bacterial communities colonising roots and leaves have been described for many plant species. In contrast, microbiologists have rarely considered flowers of naturally growing plants. We identified bacteria isolated from the surface of petals and leaves of two plant species, Saponaria officinalis (Caryophyllaceae) and Lotus corniculatus (Fabaceae). The bacterial diversity was much lower on petals than on leaves of the same plants. Moreover, the bacterial communities differed strongly in composition: while Pseudomonadaceae and Microbacteriaceae were the most abundant families on leaves, Enterobacteriaceae dominated the floral communities. We hypothesise that antibacterial floral volatiles trigger the low diversity on petals, which is supported by agar diffusion assays using substances emitted by flowers and leaves of S. officinalis. These results suggest that bacteria should be included in the interpretation of floral traits, and possible effects of bacteria on pollination are proposed and discussed.

Item Type: Article
Erschienen: 2011
Creators: Junker, Robert R. and Loewel, C. and Gross, Roy and Dötterl, Stefan and Keller, A. and Blüthgen, Nico
Title: Composition of epiphytic bacterial communities differs on petals and leaves
Language: English
Abstract:

The epiphytic bacterial communities colonising roots and leaves have been described for many plant species. In contrast, microbiologists have rarely considered flowers of naturally growing plants. We identified bacteria isolated from the surface of petals and leaves of two plant species, Saponaria officinalis (Caryophyllaceae) and Lotus corniculatus (Fabaceae). The bacterial diversity was much lower on petals than on leaves of the same plants. Moreover, the bacterial communities differed strongly in composition: while Pseudomonadaceae and Microbacteriaceae were the most abundant families on leaves, Enterobacteriaceae dominated the floral communities. We hypothesise that antibacterial floral volatiles trigger the low diversity on petals, which is supported by agar diffusion assays using substances emitted by flowers and leaves of S. officinalis. These results suggest that bacteria should be included in the interpretation of floral traits, and possible effects of bacteria on pollination are proposed and discussed.

Journal or Publication Title: Plant Biology
Uncontrolled Keywords: 16S rRNA, antimicrobial floral scents, flower, phyllosphere, random forest
Divisions: 10 Department of Biology
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10 Department of Biology > Synthetic Ecological Networks
Date Deposited: 27 Sep 2011 12:57
Official URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1438-8677.2011....
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