Maternal environment and dormancy in sunflower: The effect of temperature during fruit development

Bodrone, María Paula; Rodríguez, María Verónica; Arisnabarreta, Sebastián; Batlla, Diego

doi:10.1016/j.eja.2016.10.007

Cited by 23 publications

(46 citation statements)

References 24 publications

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“…Therefore in crops with non‐deep PD, even when the pericarp plays a role in seed dormancy, such an effect seems to be mediated by hormonal profiles, be of short‐lived type and easily removed by an after ripening period (Andrade et al ., ; Shu et al ., ; Roselló et al ., ). Whether the increased pericarp‐imposed dormancy observed at high incubation temperatures (Dominguez et al ., ) and warmer conditions during seed development (Bodrone et al ., ) still is mediated by hormonal profiles remains elusive.…”

Section: Discussionmentioning

confidence: 99%

“…In our study, on average more than 50% of the seeds produced on the more dormant cultivated material (CAC) remained dormant. Although this dormancy could have been reduced by a longer after ripening period or by lower incubation temperatures, higher temperatures during seed development (Bodrone et al ., ) and seed incubation (Dominguez et al ., ) might increase the seed dormancy expressed at the autumn, increasing the chance of seeds survival. On the other hand, a higher maladaptive germination of the seeds produced on crop plants may expose crop–wild hybrids to an intense selection for seed dormancy as the first adaptive trait, conditioning the selection for traits expressed later in the life cycle (Huang et al ., ).…”

Section: Discussionmentioning

confidence: 99%

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The role of domestication and maternal effects on seed traits of crop–wild sunflower hybrids (Helianthus annuus)

Hernández

Lindström

Parodi

et al. 2017

Annals of Applied Biology

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Hybridisation between crops and their wild relatives may promote the evolution of weeds. Seed germination and dormancy are the earliest life-history traits and are highly influenced by the maternal parent. However, the ecological role of the maternal effect on seed traits in the evolution of crop-wild hybrids has received little attention. In this study, we test the relative importance of maternal and hybridisation effects on seed traits of the first generation of crop-wild sunflower hybrids (Helianthus annuus). Seed germination was tested in two wild populations with contrasting dormancy, two cultivated materials and their reciprocal crosses at four different times after harvest and three different temperatures. Seed germination at each of the four times, after ripening response and secondary dormancy were recorded along with four morphological traits. Additionally, the pericarp anatomy was analysed with light and scanning electron microscopy. We observed strong maternal effects on all seed traits. Seed germination, morphology and pericarp anatomy differed largely between the crop and wild seeds and these traits in the crop-wild hybrids resembled their female parent. Slight but significant hybridisation effects were observed in germination, mainly in seeds produced on wild plants. Crop hybridisation changed seed germination, the after ripening response and secondary dormancy in the crop direction. Morphological and anatomical traits associated with domestication strongly correlated with the observed differences in seed germination and dormancy in crop-wild sunflower hybrids. The large maternal effects along with the evolutionary divergence in seed traits were responsible for the large phenotypic differences observed in crop-wild hybrids with the same genetic composition. Wild-like seed traits of hybrids suggest that there are no barriers to crop gene introgression at the seed level whereas crop-like seed traits could be strongly selected against, conditioning the selection of traits expressed later in the life cycle and in the next generations. & Stewart, 2005; Bagavathiannan & Van Acker, 2008; Ellstrand et al., 2010). Here we define weeds as those populations that interfere with agriculture, competing Ann Appl Biol 171 (2017) 237-251 237 Maternal effects on seed traits F. Hernández et al.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

The role of domestication and maternal effects on seed traits of crop–wild sunflower hybrids (Helianthus annuus)

Hernández

Lindström

Parodi

et al. 2017

Annals of Applied Biology

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“…Seed dormancy is regarded as the failure of an intact viable seed to complete germination under favourable conditions (Bewley, 1997). Seed dormancy is a complex trait because it is determined mainly by genetic factors but with a substantial environmental influence during seed development (Finch-Savage and Leubner-Metzger, 2006; Bodrone et al , 2017). Sunflower, unlike other crops, has a relative short domestication history which has not been able to ostensibly remove seed dormancy (Rodríguez et al , 2011), even though this crop has an important intraspecific variability for this trait (Subrahmanyam et al , 2002).…”

Section: Introductionmentioning

confidence: 99%

“…Inhibition of germination at low incubation temperatures (i.e. 10–15°C) can result from embryo dormancy and/or coat-imposed dormancy (Bodrone et al , 2017), while inhibition of germination at high temperatures (i.e. 25–30°C) is imposed by the coats (Corbineau et al , 1990; Dominguez et al , 2016).…”

Section: Introductionmentioning

confidence: 99%

Sensitivity to hypoxia and microbial activity are instrumental in pericarp-imposed dormancy expression in sunflower (Helianthus annuus L.)

Dominguez¹,

Rodríguez

Batlla

et al. 2019

Seed Sci. Res.

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We used two sunflower genotypes displaying pericarp-imposed dormancy at high incubation temperatures (i.e. 30°C) to investigate the role of the pericarp as a limitation to oxygen availability to the embryo (hypoxia), and its impact on embryo abscisic acid (ABA) content and sensitivity to ABA. Results showed that both genotypes displayed very different oxygen threshold values for inhibition of embryo germination when incubation was performed at 30°C. Expression of dormancy in one genotype was therefore related to exacerbated embryo sensitivity to hypoxia, whereas in the other genotype, the pericarp appeared to act as a more severe restraint to oxygen entry. Increased sensitivity to hypoxia was, in part, related to increased sensitivity to ABA, but not to alterations in ABA metabolism. The activity of pericarp-microbial communities (bacteria and fungi) at high temperatures was also assessed as a potential determinant of hypoxia to the embryo. Oxygen consumption in pericarps incubated at 30°C was attenuated with antibiotics, which concomitantly promoted achene germination. In agreement with the observed more severe oxygen deprivation to the embryo exerted by the pericarp, the bacterial load in the pericarp was significantly higher in the commercial hybrid than in the inbred line; however, the application of antibiotics strongly reduced the bacterial colony counts for each genotype. Different bacterial and fungal communities, assessed through their profiles of carbon-source utilization, were determined between genotypes and after treatment with antibiotics. This work highlights the relationship between enhancement of sensitivity to hypoxia with incubation temperature and seed dormancy expression, and suggests that microbial activity might be part of the mechanism through which hypoxia is imposed.

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“…Seed dormancy can affect interactions within and among species by determining the seasonal timing of germination, seedbank dynamics, and exposure of seeds and seedlings to hazards and competition for resources ( Harper 1977 ; Baskin and Baskin 2001 ). Dormancy has been shown to be under genetic control in some species, often in response to natural selection, such as in Digitaria ( Hacker 1984 ), Arabidopsis ( Alonso-Blanco et al 2003 ; Bentsink et al 2010 ) and Oryza ( Gu et al 2004 ), or it can result from conditions during seed maturation in the environment of the maternal plant and zygote ( Bodrone et al 2017 ; Penfield and MacGregor 2017 ), or both ( Postma and Agren 2015 ). To our knowledge, neither genetic nor environmental controls on dormancy have been documented in Asclepias .…”

Section: Discussionmentioning

confidence: 99%

Seed dormancy and germination vary within and among species of milkweeds

Kaye¹,

Sandlin²,

Bahm³

2018

AoB PLANTS

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Declines in pollinator populations and monarch butterflies require restoration of habitats with the plants and floral resources that support them. Monarch butterflies in particular lay their eggs exclusively on milkweed species, which their caterpillars require as a food source. Restoring populations of milkweeds can involve planting plugs grown from seed, but recommendations for breaking dormancy and germinating milkweed seeds often disagree. We tested the hypothesis that seed germination and dormancy vary within and among species of milkweed, and found substantial differences across species, and even between populations of the same milkweeds.

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Maternal environment and dormancy in sunflower: The effect of temperature during fruit development

Cited by 23 publications

References 24 publications

The role of domestication and maternal effects on seed traits of crop–wild sunflower hybrids (Helianthus annuus)

The role of domestication and maternal effects on seed traits of crop–wild sunflower hybrids (Helianthus annuus)

Sensitivity to hypoxia and microbial activity are instrumental in pericarp-imposed dormancy expression in sunflower (Helianthus annuus L.)

Seed dormancy and germination vary within and among species of milkweeds

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