Clonal Variation in Temperature Requirements for Budburst and Dehardening in<i>Salix</i>Species Used for Biomass Production

Lennartsson, Mattias; Ögren, Erling

doi:10.1080/02827580410030145

Cited by 12 publications

(8 citation statements)

References 22 publications

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“…This is particularly true if the effect is recessive with respect to the rare allele. Consequently, MAS for the A ‐allele of ELF3b‐5128 may help in selection of S. viminalis genotypes with delayed bud burst that could avoid damage caused by early spring frosts (Lennartsson & Ögren, ).…”

Section: Discussionmentioning

confidence: 99%

Association mapping in Salix viminalis L. (Salicaceae) – identification of candidate genes associated with growth and phenology

et al. 2015

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Willow species (Salix) are important as short‐rotation biomass crops for bioenergy, which creates a demand for faster genetic improvement and breeding through deployment of molecular marker‐assisted selection (MAS). To find markers associated with important adaptive traits, such as growth and phenology, for use in MAS, we genetically dissected the trait variation of a Salix viminalis (L.) population of 323 accessions. The accessions were sampled throughout northern Europe and were established at two field sites in Pustnäs, Sweden, and at Woburn, UK, offering the opportunity to assess the impact of genotype‐by‐environment interactions (G × E) on trait–marker associations. Field measurements were recorded for growth and phenology traits. The accessions were genotyped using 1536 SNP markers developed from phenology candidate genes and from genes previously observed to be differentially expressed in contrasting environments. Association mapping between 1233 of these SNPs and the measured traits was performed taking into account population structure and threshold selection bias. At a false discovery rate (FDR) of 0.2, 29 SNPs were associated with bud burst, leaf senescence, number of shoots or shoot diameter. The percentage of accession variation (Rnormaladj2) explained by these associations ranged from 0.3% to 4.4%, suggesting that the studied traits are controlled by many loci of limited individual impact. Despite this, a SNP in the EARLY FLOWERING 3 gene was repeatedly associated (FDR < 0.2) with bud burst. The rare homozygous genotype exhibited 0.4–1.0 lower bud burst scores than the other genotype classes on a five‐grade scale. Consequently, this marker could be promising for use in MAS and the gene deserves further study. Otherwise, associations were less consistent across sites, likely due to their small Rnormaladj2 estimates and to considerable G × E interactions indicated by multivariate association analyses and modest trait accession correlations across sites (0.32–0.61).

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Section: Discussionmentioning

confidence: 99%

Association mapping in Salix viminalis L. (Salicaceae) – identification of candidate genes associated with growth and phenology

et al. 2015

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“…Differences between group means with no associated letters were not significant climate warming (Jaagus 2006;Menzel et al 2006;Schwartz et al 2006) suggests that northward-transferred trees adapt to initiate a growth period earlier than northern populations (Pellis et al 2004;Luquez et al 2008) as spring bud-burst is more controlled by temperature than photoperiod (Laube et al 2014). The timing of bud-burst is considered to be an important characteristic that determines the growth rate of different hybrid aspen genotypes (Yu et al 2001a;Jansons et al 2014) and other fast-growing Salicaceae family species (Lennartsson and Ögren 2004;Weih 2009;Müller et al 2013). Genotypes with early bud-burst are able to develop a higher number of leaves by capturing priority resources (Bergh et al 2003;Müller et al 2013) and therefore grow much faster than late flushing genotypes (Yu et al 2001a;Bergh et al 2003;Müller et al 2013;Jansons et al 2014).…”

Section: Resultsmentioning

confidence: 99%

Spring and autumn phenology of hybrid aspen (Populus tremula L. × P. tremuloides Michx.) genotypes of different geographic origin in hemiboreal Estonia§

Lutter

Tullus

et al. 2016

N.Z. j. of For. Sci.

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Background: Increasing demand for renewable energy resources and the need to mitigate climate change have raised interest in short-rotation forestry with fast-growing deciduous trees like hybrid aspen (Populus tremula L. × P. tremuloides Michx.) in northern Europe. Given that climate warming has already considerably extended the growing season in this region, northward transfer of genotypes could improve forest plantation productivity and enable more efficient mitigation of climate change. We studied the spring and autumn phenology of hybrid aspen genotypes of different geographic origin (European P. tremula parent from 51°to 60°N and North American P. tremuloides parent from 45°to 54°N) 3 and 6 years after planting in a progeny trial established in Estonia at 58°N. Findings: The effect of geographic origin on spring and autumn phenology of hybrid aspen was evident at the age of 3 and 6 years. Geographic origin did not affect spring phenology. However, hybrids with P. tremula parents of northern origin, with bud-burst occurring some days later, were able to unfold and develop full-sized leaves faster than genotypes with early bud-burst. The main differences between different geographic origins appeared in the autumn of year 6, when genotypes of northern origin (60°N) started autumn defoliation significantly earlier than those of southern origin (51°to 57°N). The genotypes of southern origin (55°53′ to 57°31′ N) had a period from bud-burst to defoliation 27 days longer than that of genotypes of northern origin (60°22′ N). The interval between spring and autumn phenological processes showed significant positive correlation with current annual height growth for both study years. Conclusions: Hybrid aspen genotypes from 55°to 57°N responded well to northward transfer, having a longer leafy period and greater height increment than southward transferred genotypes. Northward-transferred genotypes were apparently better adapted to climate-change-induced extension of the growing season at higher latitudes.

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“…GDD was calculated as R (T high À T low ) where T high and T low are the maximum and minimum temperature each day (after January) that had an average temperature .18C, the threshold temperature (Lennartsson and Ogren 2004). GDD was calculated as R (T high À T low ) where T high and T low are the maximum and minimum temperature each day (after January) that had an average temperature .18C, the threshold temperature (Lennartsson and Ogren 2004).…”

Section: Methodsmentioning

confidence: 99%

Phenological cues drive an apparent trade‐off between freezing tolerance and growth in the family Salicaceae

Savage

Cavender‐Bares

2013

Ecology

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With increasing concern about the ecological consequences of global climate change, there has been renewed interest in understanding the processes that determine species range limits. We tested a long-hypothesized trade-off between freezing tolerance and growth rate that is often used to explain species range limits. We grew 24 willow and poplar species (family Salicaceae) collected from across North America in a greenhouse common garden under two climate treatments. Maximum entropy models were used to describe species distributions and to estimate species-specific climate parameters. A range of traits related to freezing tolerance, including senescence, budburst, and susceptibility to different temperature minima during and after acclimation were measured. As predicted, species from colder climates exhibited higher freezing tolerance and slower growth rates than species from warmer climates under certain environmental conditions. However, the average relative growth rate (millimeters per meter per day) of northern species markedly increased when a subset of species was grown under a long summer day length (20.5 h), indicating that genetically based day-length cues are required for growth regulation in these species. We conclude that the observed relationship between freezing tolerance and growth rate is not driven by differences in species' intrinsic growth capacity but by differences in the environmental cues that trigger growth. We propose that the coordinated evolution of freezing tolerance and growth phenology could be important in circumscribing willow and poplar range limits and may have important implications for species' current and future distributions.

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Clonal Variation in Temperature Requirements for Budburst and Dehardening inSalixSpecies Used for Biomass Production

Cited by 12 publications

References 22 publications

Association mapping in Salix viminalis L. (Salicaceae) – identification of candidate genes associated with growth and phenology

Association mapping in Salix viminalis L. (Salicaceae) – identification of candidate genes associated with growth and phenology

Spring and autumn phenology of hybrid aspen (Populus tremula L. × P. tremuloides Michx.) genotypes of different geographic origin in hemiboreal Estonia§

Phenological cues drive an apparent trade‐off between freezing tolerance and growth in the family Salicaceae

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