Transitions in photoperiodic flowering are common and involve few loci in wild sunflowers (<i>Helianthus</i>; Asteraceae)

Henry, Lucas P.; Watson, Ray H. B.; Blackman, Benjamin K.

doi:10.3732/ajb.1400097

Cited by 10 publications

(11 citation statements)

References 83 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Blackman et al 2011;Moyers & Rieseberg 2013), the patterns of genetic and phenotypic differentiation that we characterize have not been previously reported. In particular, H. argophyllus is described as 'the latest blooming of the annual sunflowers' (Heiser 1951) and as obligately flowering in response to short daylengths (Henry et al 2014). However, the early-flowering plants that we observe are likely long daylength sensitive, and largely overlap in flowering with the sympatric annual sunflowers H. annuus, H. debilis and H. praecox (B.…”

Section: Discussionmentioning

confidence: 64%

“…In particular, H. argophyllus is described as ‘the latest blooming of the annual sunflowers’ (Heiser ) and as obligately flowering in response to short daylengths (Henry et al . ). However, the early‐flowering plants that we observe are likely long daylength sensitive, and largely overlap in flowering with the sympatric annual sunflowers H. annuus , H. debilis and H. praecox (B. Moyers, personal observation; Heiser et al .…”

Section: Discussionmentioning

confidence: 97%

See 1 more Smart Citation

Remarkable life history polymorphism may be evolving under divergent selection in the silverleaf sunflower

Moyers

Rieseberg

2016

Molecular Ecology

View full text Add to dashboard Cite

Substantial intraspecific variation in life history is rare and potentially a signal of incipient ecological speciation, if variation is driven by geographically heterogenous natural selection. We present the first report of extensive life history polymorphism in Helianthus argophyllus, the silverleaf sunflower, and examine evidence for its evolution by divergent selection. In 18 populations sampled from across the species range and grown in a common garden, most quantitative traits covaried such that individuals could be assigned to two distinct life history syndromes: tall and late flowering with small initial flowerheads, or short and early flowering with larger initial flowerheads. Helianthus argophyllus exhibits regional genetic structure, but this population structure does not closely correspond with patterns of phenotypic variation. The early-flowering syndrome is primarily observed in populations from coastal barrier islands, while populations from the nearby mainland coast, although geographically and genetically close, are primarily late flowering. Additionally, several traits are more differentiated among regions than expected based on neutral genetic divergence (QST > FST ), including the first principal component score corresponding with life history syndrome. This discordance between patterns of phenotypic and genetic variation suggests that divergent selection is driving genetic differences in life history across the species range. If so, the silverleaf sunflower may be in early stages of ecological speciation.

show abstract

Section: Discussionmentioning

confidence: 64%

Section: Discussionmentioning

confidence: 97%

Remarkable life history polymorphism may be evolving under divergent selection in the silverleaf sunflower

Moyers

Rieseberg

2016

Molecular Ecology

View full text Add to dashboard Cite

show abstract

“…In Helianthus, flowering is strongly influenced by both photoperiod and temperature cues (Leon et al, 2001). Days to anthesis has been noted to decrease with increasing latitude in Maximilian sunflower and other wild Helianthus species (Kawakami et al, 2011;Henry et al, 2014), and a latitudinal effect on flowering was observed in populations collected for this study of plants grown both in common garden plots and growth chambers. Single nucleotide polymorphisms associated with temperature (frost-free days, average daily June temperature, and elevation), days to anthesis, and capitulum diameters were detected.…”

Section: Environmental Associations and Implications For Selecting Fomentioning

confidence: 60%

“…Often tradeoffs are observed between biomass accumulation and timing of reproduction (Egli, 2011). Days to anthesis has been noted to decrease with increasing latitude in Maximilian sunflower and other wild Helianthus species (Kawakami et al, 2011;Henry et al, 2014), and a latitudinal effect on flowering was observed in populations collected for this study of plants grown both in common garden plots and growth chambers. In Helianthus, flowering is strongly influenced by both photoperiod and temperature cues (Leon et al, 2001).…”

Section: Environmental Associations and Implications For Selecting Fomentioning

confidence: 65%

Genetic Characterization of Maximilian Sunflower for the Development of a Locally Adapted Perennial Grain Oilseed

2018

View full text Add to dashboard Cite

Maximilian sunflower (Helianthus maximiliani Schrad.), a crop wild relative of sunflower (Helianthus annuus L.), has been identified as a species of interest for the development of a perennial oilseed crop. Knowledge of the diversity, the potential for crop development, and genomic resources of this crop wild relative is limited. To facilitate its use in breeding programs, a baseline characterization of locally adapted germplasm is required to develop informed breeding strategies. Individuals were collected from nine sites in southern Manitoba, Canada, and characterized for phenotypic and genotypic divergence to estimate traits of interest for the implementation of a breeding program in Maximilian sunflower. Genotype‐by‐sequencing was used to characterize population genetic parameters and identify candidate single nucleotide polymorphisms (SNPs) associated with phenotypic divergence and environmental differences between collection sites. Candidate SNPs associated with frost‐free period, temperature during the primary vegetative growth period, elevation, soil CaCO3 equivalent, days to anthesis and capitulum size were identified and may be useful for the improvement of H. maximiliani and crop species related to cultivated sunflower. Associations between temperature, population structure, and overall plant size were also identified, suggesting phenotypic divergence across a local temperature gradient. The sampled Maximilian sunflower populations exhibited a high degree of polymorphism, low levels of inbreeding, and a highly heterozygous genome at the local scale, traits that favor the establishment of locally adapted germplasm pools. There appears to be sufficient variation to make selections for agronomic traits in local germplasm of Maximilian sunflower to support its development as a perennial oilseed.

show abstract

“…Association and quantitative trait locus (QTL) mapping studies of photoperiod response have implicated anywhere from a handful to as many as 14 loci contributing to intraspecific variation (e.g. Coles et al, 2010;Anderson et al, 2011;Hung et al, 2012;Henry et al, 2014;Jiang et al, 2014). Some of these loci represent allelic series, and different subsets of the loci may be combined to produce equivalent day-neutral phenotypes (e.g.…”

Section: Variation In Magnitude Of Photoperiodic Responsementioning

confidence: 99%

Changing Responses to Changing Seasons: Natural Variation in the Plasticity of Flowering Time

Blackman

2016

Plant Physiol.

Self Cite

View full text Add to dashboard Cite

For plants that live in seasonally changing environments, timing is everything. Matching developmental transitions with the best times of year for growth and reproduction is necessary to maintain high fitness. Consequently, plants employ many mechanisms to sense and integrate multiple predictive seasonal cues to regulate their major developmental shifts. As the annual timing with which the growing season starts and ends changes across the landscape, natural selection has led to the evolution of the mechanisms that regulate the developmental plasticity of flowering among populations or varieties of species and crop plants that inhabit broad geographic ranges. There has been significant recent progress in describing the diversity of this variation in flowering time plasticity and in identifying the specific genetic changes responsible. Such work is an essential step toward understanding the processes that have shaped current and past adaptation, managing genetic diversity and improving crops in the face of climate change, and forecasting how populations may respond plastically and evolutionarily to future environmental challenges. In this Update, I review the findings of recent studies of natural variation in the plasticity of flowering to photoperiod, vernalization, and ambient temperature, and the implications and open questions raised by this work are considered.A fundamental adaptation of plants inhabiting seasonal environments is their ability to match the annual timing of major life history transitions to the local growing season. Most species achieve this synchrony through developmental plasticity. In other words, individuals sense how environmental cues like daylength and temperature change from winter to spring to summer to fall. The information gleaned from these cycles is then integrated molecularly so that germination, flowering, and other key transitions occur during periods favorable for growth, reproduction, and seed set. However, as the climate changes over the 21st century and the relative timing of annual cycles in temperature and precipitation shifts, once adaptive responses will no longer effectively predict the best calendar dates to initiate these essential developmental events (Nicotra et al., 2010;Wilczek et al., 2010). Because natural populations and cultivated landraces of many taxa have evolved to thrive in geographically diverse habitats and climates as their ranges have expanded, they harbor natural variants that may prove instructive in breeding crops and conserving native plant diversity in the face of future environmental challenges. Thus, a critical objective in plant biology is

show abstract

Transitions in photoperiodic flowering are common and involve few loci in wild sunflowers (Helianthus; Asteraceae)

Cited by 10 publications

References 83 publications

Remarkable life history polymorphism may be evolving under divergent selection in the silverleaf sunflower

Remarkable life history polymorphism may be evolving under divergent selection in the silverleaf sunflower

Genetic Characterization of Maximilian Sunflower for the Development of a Locally Adapted Perennial Grain Oilseed

Changing Responses to Changing Seasons: Natural Variation in the Plasticity of Flowering Time

Contact Info

Product

Resources

About