Bilan d'une expérience comparative de provenances de mélèzes à l'âge de 13 ans

Lacaze, J.-F.; Birot, Yves

doi:10.1051/forest/19740301

Cited by 8 publications

(5 citation statements)

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“…Regarding stem straightness, the differences were small and rarely significant. The hybrids were no straighter than the parent species, contrary to what Lacaze and Birot (1974) observed.…”

Section: Performance Of Hybrids Versus Non-hybrid Treescontrasting

confidence: 93%

“…Not only does hybrid larch (Larix 9 eurolepis Henry) feature good resistance to larch canker (Lachnellula willkommii) (Edwards 1956;Sylvestre et al 1999), it has shown better growth than either parent species in many instances (e.g. Ferrand and Bastien 1985;Pâques 1992;Baltunis et al 1998;Pâques et al 2013) and sometimes has a better form (Lacaze and Birot 1974) and a better survival rate (Miller and Thulin 1967;Zaczek et al 1994). For wood properties, the hybrid is usually intermediate between EL and JL or better than the best parent (Nanson and Sacré 1978;Reck 1980;Bastien and Keller 1980).…”

Section: Introductionmentioning

confidence: 99%

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Composition of hybrid larch (Larix × eurolepis Henry) forest reproductive materials: How much does hybrid percentage affect stand performance?

Philippe¹,

Buret²,

Matz³

et al. 2016

New Forests

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The performance of hybrid larch (Larix 9 eurolepis) stands may be altered by the fact that the seed lots produced in hybridization seed orchards always contain a proportion of non-hybrid seeds. We studied the effect of such hybrid/non-hybrid mixtures on the productivity and quality of young plantations, through a three-step process: determination of tree species identity with cytoplasmic DNA markers, comparison of hybrid and non-hybrid tree performance, and finally, assessment of thinning impact on hybrid percentage. Overall, we analyzed progenies from eight commercial seed orchards at three sites. Huge variations in hybrid percentage were found among orchard progenies. Globally, the results concerning survival, susceptibility to drought and to Meria laricis, growth, stem form and wood stiffness were clearly in favor of hybrids. In particular, they grew faster than the non-hybrid trees and exhibited a more homogeneous growth than the mixed progenies. Hybrid superiority was highest for orchards composed of a single maternal clone of a species which was poorly adapted to the planting site. Hybrid percentage was enhanced by successive thinnings. However, a serious loss of income is expected when planting progenies characterized by low initial hybrid percentage and high hybrid superiority. Moreover, variations in hybrid percentage proved to be problematic in seed orchard testing as seed orchard ranking may change depending on whether it is based on the performance of all trees or hybrids only. These variations reduce the reliability of the recommendations typically made to forest owners. For commercial and silvicultural reasons, we suggest setting a minimal threshold level of 60-70 % for hybrid percentage in marketed forest reproductive materials.

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“…Regarding stem straightness, the differences were small and rarely significant. The hybrids were no straighter than the parent species, contrary to what Lacaze and Birot (1974) observed.…”

Section: Performance Of Hybrids Versus Non-hybrid Treescontrasting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Composition of hybrid larch (Larix × eurolepis Henry) forest reproductive materials: How much does hybrid percentage affect stand performance?

Philippe¹,

Buret²,

Matz³

et al. 2016

New Forests

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“…Indeed, a number of authors have observed a link between crown width and larch vigour (e.g. LACAZE and BIROT, 1974;STIPANICIC, 1984;BALTUNIS and GREENWOOD, 1996). L. decidua or L. kaempferi as mother trees of HL: breeding (≈ 2008 -2013) and testing (≈ 2016 -2035) At present, we don't know if one hybrid type (E x J or J x E) out performs the other in growth rate, because few progenies have been compared and few studies have used the same parent material.…”

Section: Methodsmentioning

confidence: 99%

A Strategy for the Second Breeding Cycle of Larix x marschlinsii in Québec, Canada Including Experiments to Guide Interspecific Tree Breeding Programme

Perron

2008

Silvae Genetica

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A strategy for the genetic improvement of Larix decidua P. Mill., L. kaempferi (Lamb.) Carrière and their hybrid (L. x marschlinsii Coaz) in Québec, Canada, was set up to provide short and long-term genetic gains, as well as basic populations for some fundamental experiments. A reciprocal recurrent selection with forward selection strategy (RRS-FS) will be applied by using a pollen mix breeding with a partial population paternity analysis (PMX/WPPA). The genetic mechanisms responsible for heterosis among trees remain poorly understood. This complicates the implementation of multi-species genetic improvement programmes seeking to achieve the full benefits of interspecific hybridization. Various strategies to exploit heterosis are outlined. To expand our knowledge and guide our future choices, basic research has been integrated directly into breeding and testing activities, as well as through experiments integrated within activities leading to recommendations about the top-ranked families to be used in reforestation (cuttings). These experiments can also serve as the basis for future studies seeking a better understanding of heterosis through molecular genetics.

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“…Other examples have been given by Vincent and Fer (1965) and Lacaze and Birot (1974 The greater uniformity of the F 1 generation progeny over the parental progenies has also been recognized as an advantage in favor of hybrids. This was the main conclusion drawn by Lacaze and Birot (1974) (Nilsson, 1959) and with Larix laricina for its presumably good adaptation to wet soils (Ferrand, 1986 (Keiding, 1980;Reck, 1977;Vincent and Machanicek, 1972 Keiding (1980) (Hinkelmann, 1974) or better suited to our purposes, a nested population diallel or factorial mating design such as that used by Park and Gerhold (1986) (Namkoong, 1979;Falconer, Keiding (1968). His results, based on a limited number of crossings between two noninbred European larch parents and a few number of first-generation selfed (S1) parents of Japanese larch, show that nonnegligible supplementary gains (5-10%) and uniformity for total height can be obtained in this manner compared to normal (no selfing) inter-specific crossing.…”

Section: Introductionmentioning

confidence: 95%

“…seed sources from their native range (the Alps) to more lowland areas has not been successful in France. Several provenance tests have shown its poor adaptation, slow growth, and canker susceptibility (Lacaze and Birot, 1974;Ferrand and Bastien, 1985, Schober, 1985 when cultivated at lower elevations. On the other hand, Japanese larch Larix kaempferi (Lamb.)…”

Section: Introductionmentioning

confidence: 99%

A critical review of larch hybridization and its incidence on breeding strategies

Pâques¹

1989

Ann. For. Sci.

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Summary ― Hybrid larch (Larix X eurolepis Henry) superiority over the parental species (Larix decidua Mill. and Larix kaempferi (Lamb.) Carr.) has been described by many tree breeders. This superiority concerns not only growth characteristics but also several economically important traits.In the literature, there is some ambiguity regarding the 3 following concepts : hybridization, hybrid superiority and heterosis. In particular, the superiority of hybrid larch has been claimed in many studies as due to heterosis. A detailed review of published results does not permit a decisive opinion on the subject as most of the results are based on punctual and limited observations.The interest in hybridization is not restricted to hybrid vigor but also includes combination and transfer of favorable characteristics. Several larch improvement strategies based on inter-and intraspecific hybridization are discussed. Reciprocal recurrent selection seems particularly attractive. Nevertheless, none of the present strategies, including the F, generation as a breeding population, can be excluded. Precise knowledge on genetic properties of traits selected for are required before any firm recommendation can be made.There is an urgent need for well designed, long-term experiments set up on several sites to obtain more insight into these delicate questions. Use of a two-level factorial mating design is recommended, in particular to avoid some of the approximations made in past experiments. Moreover, valuable information on genetic parameters, e.g. combining ability, heterosis, will be gained at both intra-and inter-species and intra-and inter-population levels and may help tree breeders in their choice of a more efficient hybridization strategy for the improvement of larch.

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Bilan d'une expérience comparative de provenances de mélèzes à l'âge de 13 ans

Cited by 8 publications

References 0 publications

Composition of hybrid larch (Larix × eurolepis Henry) forest reproductive materials: How much does hybrid percentage affect stand performance?

Composition of hybrid larch (Larix × eurolepis Henry) forest reproductive materials: How much does hybrid percentage affect stand performance?

A Strategy for the Second Breeding Cycle of Larix x marschlinsii in Québec, Canada Including Experiments to Guide Interspecific Tree Breeding Programme

A critical review of larch hybridization and its incidence on breeding strategies

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