Valutazione di caratteri quantitativi per il miglioramento della produzione di biomassa in Populus alba L.
Author(s)
Ricciotti, Luca
Date Issued
October 22, 2008
Type
Doctoral Thesis
Abstract
In the last years new lines of search have been developed applied to the sour-forest field, finalized to the development of the best techniques and to the selection and the genetic improvement of material vegetable for the production of the biomass. These studies experience them have been favourite from the political necessities generated from the excessive energetic consumption of the Countries industrialize to you and emerged subject to an intense economic development and the contemporary increase of the costs of the fossil energetic sources. The sparsity of these sources, and their implicit increase of price, are the consequence of the inborn sparsity of these assets in along
period, of the meaningful increase of the not supported total question from a production increase in the long and medium term, and of the continuous political-military tensions that have in many States producers.
For the production of the biomass in sour-forest field, the forest plantations to short turn (Short
Rotation Forestry) will only be able to have a meaningful role if the difficulties, of technical and economic nature, today found in this particular field of agriculture, will be faced and resolved. In Italy, the species considered useful for these productions is those to express increase of the kinds Eucaliptus L., Populus L. and Salix L.. In lands it considers marginal assumes the employment you of Robinia pseudoacacia L.. As far as the Populus genus of trees, it objects it you of the selection
activity and genetic improvement heads to obtain a high production, an express increase and one
greater tolerance to the stress.
Near the Department of Forest Resources and Environment (DiSAFRi) of the University of the
Tuscia, in the last years have been realized collections of germplasm of Populus, in particular of Populus alba L. and Populus nigra L..
The collected genetic material has been developed to the inside of the Agrarian Company of the
University of the Tuscia, whose progeny have constituted families of stepbrothers (half sib). The single genotypes have been identifying to you for means of a code, which it renders the
identification of the family and the population of belongings possible. Beyond to the former
conservation ex-situ, these families half sib turn out to be an optimal line of departure for studies of genetics of the populations and quantitative genetics.
The quantitative characters you, to the base of the production of the biomass, can be comprised
through the study of the progeny first generation generated from genotypes of poplar pertaining to
the same different species or species. Consequently, it has been generated pedigree that the widest genetic variability of the species enclosed, using of the coming from ancestral celebrations from atmospheres and various latitudes much.
The pedigree of poplar white man, called POP4 (142 genotypes), studied in this activity of search, have been obtained from the crossing of the ancestral celebrations "14P11" and "6K3", that they make part of natural populations very distinguished. "14P11" it is the feminine parent (♀), and belongs to the family deriving from the plant mother 14P, original of southern Italy (Policoro, MT).
"6K3" (♂), that it belongs to the family 6K, it is original of northern Italy (Carcare, SV).
In the within of the European plan of search, called POPYOMICS, through the study of this
progeny it is tried to estimate and to comprise the importance of some quantitative characters been involved you in the production of the biomass in the native species of P. alba. This activity of integral search with studies of necessary molecular Biology to the location of the genetic markers been involved in the expression of the characters, using an analysis QTL (Quantitative Trait Loci) finalized to the genetic improvement and the development of the selection assisted from molecular markers (MAS).
The experimentation has been lead in three situated ones situates to you in England, France and Italy. The systems have been realize to you and managed with the same technical criteria. The
characters estimated in the experimentation can be distinguished in characters legacies to the
increase and the production, circumference, height, index of volume, production of biomass, in
characters legacies to the morphology of the leaf, leaf area and length of the petiole, and in
characters who describe the ramification of the plants, number of branches sylleptic and index of
branches.
In order to catch up he objects it to you places, the experimentation has been second lead a general
plan of job very defined. Such slowly he is subdivided second this makes yourself: 1. Collection of the data; 2. Correction of the data (location of the outliers, transformation of the data, adjustment spaces
them of the data); 3. Analyses of the data intra-site (medium fixed genotypic, hereditability characterize them and genotypic, correlation between characters, heterosis); 4. Analysis of the data inter-site (components of the variance, correlation between situated for single characters).
Additional information
Dottorato di ricerca in Ecologia Forestale
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