Reduced genetic diversity and enhanced germination potential characterize European black locust (Robinia pseudoacacia L.)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F18%3A43914541" target="_blank" >RIV/62156489:43410/18:43914541 - isvavai.cz</a>

Result on the web

<a href="http://nnext.boku.ac.at/images/publications/NNEXT_Conference_2018_Book_of_Abstracts.pdf" target="_blank" >http://nnext.boku.ac.at/images/publications/NNEXT_Conference_2018_Book_of_Abstracts.pdf</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Reduced genetic diversity and enhanced germination potential characterize European black locust (Robinia pseudoacacia L.)

Original language description

Robinia pseudoacacia L. is a North American tree which has now broadly spread in Europe. In order to evaluate the evolutionary mechanisms behind its invasiveness, it is crucial to identify the population sources of the introduction and to understand which traits contributed to its success in the European range. To undertake a population genetics study, we performed a large sampling both in the invasive and native ranges; 818 individuals from 63 populations were genotyped using 113 SNPs. We detected clonal genotypes in each population and analyzed population structure both between and within ranges and then, we compared the genetic diversity among ranges. First, we demonstrated that European black locust was introduced from only a limited number of populations located in the plateau of the Appalachians Mountains; this is in agreement with historical records. Within America, population structure reflected long time evolutionary processes whereas in Europe, it was largely impacted by human activities. In the European range, the genetic clustering may be a signal of evolution caused by artificial selection due to human oriented mass selection or tree breeding initiated in Central Europe since the 18th century. Second, we evidenced a genetic bottleneck among ranges with a decrease in allelic richness and in the total number of alleles in Europe. Lastly, we found more clonality within the European populations. Conjointly to the population genetic analysis, we conducted a quantitative genetics experiment to evaluate juvenile traits of both native and invasive black locust populations (3000 individuals from 20 populations) grown under 3 different temperature conditions (18oC, 22oC and 31oC). Results revealed an enhanced germination rate among European populations compared to that of the native American populations whatever the environmental condition (88% vs 60%). Thus a possible scenario may be that Man would have selected and propagated the best seeds in the new range that would have favored an evolution of germination rate through European populations. In any case, the human role on the reproductive potential, both sexual and asexual, within the introduced range would likely be a key process in the success of black locust dynamics in Europe.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

40102 - Forestry

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů