Presentation on theme: "Larix decidua polonica in Western Europe First results from a joined European network of progeny trials Pâques Luc E. INRA-Orléans Unité AGPF."— Presentation transcript:
Larix decidua polonica in Western Europe First results from a joined European network of progeny trials Pâques Luc E. INRA-Orléans Unité AGPF
Context European larch shows a large intra-specific variation, Populations from Central Europe are of special interest (core of the gene pool), (from Schober 1981 and 1985, in Weisgerber and Sindelar 1992).
Context –ecological flexibility –behaviour to drought stress –vigour –canker-resistance –wood quality But –stem form is mostly poor. Central Poland origins show original traits in terms of : Ex.Curnel et al Results gained and published from IUFRO international trials with a limited set of provenances
Objectives to broaden the geographic origin of the provenances, to get a better picture of the structuration of the genetic variability, to examine seed transfer possibilities from East to West, to confirm the interest of polish larch for wood quality and problems connected with stem straightness. to broaden the breeding population, to take benefits of polish larch properties in interspecific hybridization.
Material & Methods Joined cone collection by INRA & IBL in Mont Gory Swietokezyski in Dec.1987, 157 open-pollinated progenies, randomly chosen ( except distances and level of fructification ), in 4 autochtonous ‘stands’ ( mainly old natural reserves ). material shared with IBL and SRFGx
Meria laricina A major recurrent problem in moist mild spring in Bort Polish larch (but also other EL): high sensitivity Hybrid larch & Japanese larch: low sensitivity
Well…well… MortalityTop- dieback ‘Drought’ cracks Wind firmness Meria Arceyxx (X) nnn Plachet n (X) xx nn Bort n xxx Croze nnnnn Rance n ???? Villancexx ???? No mention of canker
And growth… and straightness…?
Field trial networks and difficulties Experimental design Site preparation Spacing Thinning Traits assessed and timing thinned
Site ‘fertility’ yrs Correction for spacing/ mortality/ thinning/ age assessment Polish sites more vigorous than FR/BE sites (up to 4x more BA MAI !!) ? In France, ratio of 1 to 3 among sites.
Site ‘fertility’ Blue : 4-7 yrs /yellow : yrs Blue: yrs / yellow: yrs (thinning in Bort & Croze)
Relative performance of polonica vs sudetica and other larch taxa In France Height: polonica >= to other provenance or taxa Girth: idem but < to hybrids In Belgium (Height: polonica < to others) Girth: idem
Stem straightness crooked straight From J.Kowalczyk Stem form: Worst on Polish sites Best on French sites
Relative performance of polonica vs sudetica and other larch taxa Globally polonica - < to hybrid larch, - to sudetica - to Japanese larch
Summary sudeticaJLHL Villance survival eq<< growth eq<< stem form <<< Rance survival eq<< growth eq<< stem form <>eq>> growth >>eq<< stem form eq << Croze survival > << stem form eq << Arcey survival eq>> growth >> < stem form eq << Plachet survival eq>>> growth >> << stem form eq>><<
But a large variability among progenies exists…
Perspectives… Prog = crop on best 30 trees in PL stand SO = clonal seed orchard with best 30 clones
Conclusions Polonica larch is globally valuable for French conditions on most sites; questions about the Belgian sites Perspectives for selection are favourable and needed (stem form) Nevertheless care with regards to behaviour to some abiotic (heat/drought/wind) and biotic stress (Meria) is needed on susceptible sites (ex. Bort, Plachet).