Indirect prediction of bud flushing from ex situ observation in hybrid Larch (Larix decidua x L. kaempferi) and their parents

Gauchat, María Elena; Pâques, Luc

doi:10.1016/j.envexpbot.2010.08.001

Cited by 7 publications

(6 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Measurements included breast-height circumference (BHC), total height (HT), stem exuosity (FLX) and bud ush (BUD), and concerned all available trees at each assessment (except for SA in 2005). Stem exuosity and terminal bud ushing were visually assessed using subjective scoring scales, following Keiding and Olsen (1965)(see Pâques, 1992b) for exuosity (from 5: Manuscript straight stem to 1: stems with several severe crooks) and Gauchat and Pâques (2011) (Fig. 1) for bud ush (from 0: dormant bud to 5: elongated needles, 1-2 cm in open rosette; plus an extra class 6: stem elongation).…”

Section: Measurementsmentioning

confidence: 99%

Hybrid larch heterosis: for which traits and under which genetic control?

Marchal

Muñoz

Millier

et al. 2017

Tree Genetics & Genomes

View full text Add to dashboard Cite

Despite the interest foresters have for interspecic hybrid trees, still little is known about their quantitative genetics. This is especially true for the hybrid (HL) between Larix decidua (EL) and L. kaempferi (JL). Long-term, well-designed, multi-site experiments are necessary to estimate the parameters required for HL breeding programs. This paper presents the results from a diallel mating trial between 9 EL and 9 JL, set up in 3 contrasted sites. Growth traits (height, circumference), quality traits (wood density, stem form, heartwood proportion), and bud ush were measured from plantation to up to 18 years after plantation. Wood density and heartwood proportion were assessed using increment cores. We did a spatial analysis to take into account environmental heterogeneity at the tree level, and we tted a multi-trait, Bayesian MCMC (Markov Chain Monte Carlo) genetic model. Our study conrmed, in most situations, that HL expressed heterosis over its best parent for growth traits taking advantage of an early faster growth, with no loss in wood density. However, growth traits showed low levels of heritability. On the other hand, bud ush and stem exuosity had high heritabilities, and wood density was clearly under JL control. Site-dependent heritabilities were expressed by EL. Additive genetic correlations were presented. The traits with high heritabilities showed high correlation between their performances in pure species and in hybridization, as well as high across-site correlations. The discussion focused on the interest of these genetic parameters for the hybrid larch breeding programs.

show abstract

Section: Measurementsmentioning

confidence: 99%

Hybrid larch heterosis: for which traits and under which genetic control?

Marchal

Muñoz

Millier

et al. 2017

Tree Genetics & Genomes

View full text Add to dashboard Cite

show abstract

“…For example, BB in Published 2012 This article is a U.S. Government work and is in the public domain in the USA, Global Change Biology, 18, 2008Biology, 18, -2025 two Acer species in a warming experiment varied by only 20-37 GDD (under most conditions; Norby et al, 2003). Median BB varied by 37 GDD over 9 years in mature Fagus (Rousi & Heinonen, 2007), and by 89 GDD in progeny trials of Larix buds (Gauchat & Paques, 2011). In the current experiment, however, GDD at BB was more variable, and when accumulated from January 1, varied by 180-430 GDD, depending on species.…”

Section: Environmental Cuesmentioning

confidence: 99%

Forest phenology and a warmer climate – growing season extension in relation to climatic provenance

Gunderson

Edwards

Walker

et al. 2012

Global Change Biology

128

View full text Add to dashboard Cite

Predicting forest responses to warming climates relies on assumptions about niche and temperature sensitivity that remain largely untested. Observational studies have related current and historical temperatures to phenological shifts, but experimental evidence is sparse, particularly for autumn responses. A 4 year field experiment exposed four deciduous forest species from contrasting climates (Liquidambar styraciflua, Quercus rubra, Populus grandidentata, and Betula alleghaniensis) to air temperatures 2 and 4 °C above ambient controls, using temperature‐controlled open top chambers. Impacts of year‐round warming on bud burst (BB), senescence, and abscission were evaluated in relation to thermal provenance. Leaves emerged earlier in all species by an average of 4–9 days at +2 °C and 6–14 days at +4 °C. Magnitude of advance varied with species and year, but was larger for the first 2 °C increment than for the second. Effect of warming increased with early BB, favoring Liquidambar, but even BB of northern species advanced, despite temperatures exceeding those of the realized niche. Treatment differences in BB were inadequately explained by temperature sums alone. In autumn, chlorophyll was retained an average of 4 and 7 days longer in +2 and +4 °C treatments, respectively, and abscission delayed by 8 and 13 days. Growing seasons in the warmer atmospheres averaged 5–18 days (E2) and 6–28 days (E4) longer, according to species, with the least impact in Quercus. Results are compared with a 16 years record of canopy onset and offset in a nearby upland deciduous forest, where BB showed similar responsiveness to spring temperatures (2–4 days °C−1). Offset dates in the stand tracked August–September temperatures, except when late summer drought caused premature senescence. The common garden‐like experiment provides evidence that warming alone extends the growing season, at both ends, even if stand‐level impacts may be complicated by variation in other environmental factors.

show abstract

“…Progeny tests have revealed high amounts of genetic variation at the family level for growth and quality traits, and a significant potential for selection and breeding (Barzdajn 2010, Gagov et al 2005, Mihai et al 2014. To assess the genetic potential for selection within and among families, the level of genetic control of economic and adaptive traits must be determined .…”

Section: Introductionmentioning

confidence: 99%