Bottalico, Francesca

Buonamici, Anna

Fiorentini, Silvia

Labriola, Mariaceleste

Materassi, A.

Paffetti, Donatella

Travaglini, Davide

Vettori, Cristina

English

Florence Research

Proceedings of the 57th Italian Society of Agricultural Genetics Annual CongressFoggia, Italy – 16/19 September, 2013ISBN 978-88-904570-3-6Oral Communication Abstract – 5.05POTENTIAL HAZARD DUE TO BREEDING BETWEEN POPLARCULTIVATIONS AND WILD RELATIVES IN MEDITERRANEANENVIRONMENTPAFFETTI D.*, BUONAMICI A.**, TRAVAGLINI D.***, LABRIOLA M.*,**, BOTTALICOF.***, FIORENTINI S.***, MATERASSI A.****, VETTORI C.***) DISPAA-UNIFI, Piazzale della Cascine 18, 50144 Florence (Italy)**) IGV-CNR, UOS FI, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Florence (Italy)***) GESAAF-UNIFI, Via S. Bonaventura 13, 50145 Florence (Italy)****) IBIMET-CNR, UOS SS, Via Traversa la Crucca 3, 07100 Li Punti, Sassari (Italy)Populus spp., spatial genetic structure, hybridization, gene flow, genetic diversity conservationMost strategies for the genetic improvement and biotechnologies may be applied to thepoplars (Populus spp.) and their hybrids to increase productivity and adaptability. Due to thesefacilities, these trees are often used for applications in bioenergy, remediation, and carbonsequestration. However, their weak reproductive barriers and spontaneous hybridization withnatural populations may impact the sustainable deployment of new poplar cultivars. Deforestationand intensive management, with plantations of fast-growing tree species, may endanger tree speciesby the destruction or loss of their habitats, but also by loss of species integrity through hybridizationand introgressive gene flow. Consequently, the implementation of conservation strategies requiresthe monitoring of gene flow in relation to habitat structure. These issues hold true for nativepoplars, which are considered one of the threatened forest tree species of natural floodplain forestsin the temperate zones.For the purpose to establishing best management approaches for genetic diversityconservation, the objectives of this work were the characterization of spatial genetic structure inpoplar stand, and the study of the potential breeding between natural and cultivated populations inthe Mediterranean environment.Two areas were settled within a natural protected area, the Regional Park of Migliarino-SanRossore-Massaciuccoli (Pisa). Area A is a naturally-originated mixed forest stand, and it is close totwo poplar plantations. In the Area B, single trees and small groups of Populus spp. are scattered ina wetland habitat, along the shores of the Massaciuccoli Lake, near to a poplar plantation. In AreaA, poplar naturally-originated were analyzed and assigned, by the sequence analysis, to P. alba, andP. x canescens hybrid. In the Area B individuals o f P. nigra are present. The spatial geneticstructure showed that four distinct clusters can be identified in the Area A and three clusters in AreaB. In the Area A, the high FST values and the low FIS values suggest the isolation of thesubpopulation and the absence of gene flow, due to other tree species acting as barriers. In contrastin the Area B, a moderate gene flow was found among clusters demonstrating the presence of weakbarriers. The differences between the spatial genetic structure depended on the environmentalfeatures of two habitat. The detection of hybridization (by paternity analysis) between the Area Aand the poplar plantation, suggested the occurrence of a possible genetic exchange among a naturalstand and the plantation which has to be carefully considered when poplar plantation are made closeto natural environment in which parental relatives are present.Besides, the potential hazard due to hybridization between poplar cultivations and its wildrelatives in the surrounding environments of the Regional Park was investigated. Based on thegenetic information and using the spatial dataset available for the study area, it seems that gene flowcould affect important habitats hosting naturally originated poplar population. The assessment ofthis potential hazard indicates that some management measures are required to mitigate the risk.

Potential hazard due to breeding between poplar cultivations and wild relatives in Mediterranean environment

https://flore.unifi.it/bitstream/2158/848102/1/5_05.pdf

Potential hazard due to breeding between poplar cultivations and wild relatives in Mediterranean environment

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