Nectar sugars and bird visitation define a floral niche for basidiomycetous yeast on the Canary Islands

Annals of Occupational and Environmental Medicine

Moritz Mittelbach³  Andrey M Yurkov¹  Daniele Nocentini⁴  Massimo Nepi⁴  Maximilian Weigend²  Dominik Begerow³ 

[1] Leibniz Institute DSMZ - German Collection of Microorganisms and Cell Cultures, Braunschweig, Germany

[2] Nees Institute for biodiversity of plants, Rheinische Friedrich-Wilhelms-Universität, Bonn, Germany

[3] Department of Geobotany, - LS Evolution & Biodiversity of Plants, Ruhr-University Bochum, ND 1/150 / Universitaetsstr. 150, Bochum, 44780, Germany

[4] Department of Life Sciences, University of Siena, Siena, Italy

关键词: Nectar-dwelling yeast;    Canary Islands;    Boraginaceae;    Bird pollination;    Basidiomycetes;   

Others  :  1128392
DOI  :  10.1186/s12898-015-0036-x

 received in 2014-09-03, accepted in 2015-01-15,  发布年份 2015

【 摘 要 】

Background

Studies on the diversity of yeasts in floral nectar were first carried out in the late 19^th century. A narrow group of fermenting, osmophilous ascomycetes were regarded as exclusive specialists able to populate this unique and species poor environment. More recently, it became apparent that microorganisms might play an important role in the process of plant pollination. Despite the importance of these nectar dwelling yeasts, knowledge of the factors that drive their diversity and species composition is scarce.

Results

In this study, we linked the frequencies of yeast species in floral nectars from various host plants on the Canary Islands to nectar traits and flower visitors. We estimated the structuring impact of pollination syndromes (nectar volume, sugar concentration and sugar composition) on yeast diversity.

The observed total yeast diversity was consistent with former studies, however, the present survey yielded additional basidiomycetous yeasts in unexpectedly high numbers. Our results show these basidiomycetes are significantly associated with ornithophilous flowers. Specialized ascomycetes inhabit sucrose-dominant nectars, but are surprisingly rare in nectar dominated by monosaccharides.

Conclusions

There are two conclusions from this study: (i) a shift of floral visitors towards ornithophily alters the likelihood of yeast inoculation in flowers, and (ii) low concentrated hexose-dominant nectar promotes colonization of flowers by basidiomycetes. In the studied floral system, basidiomycete yeasts are acknowledged as regular members of nectar. This challenges the current understanding that nectar is an ecological niche solely occupied by ascomycetous yeasts.

【 授权许可】

   
2015 Mittelbach et al.; licensee BioMed Central.

【 图 表 】

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