A simulation model to predict seed dormancy loss in the field for Bromus tectorum L.

Bauer, Maren Christensen; Meyer, Susan E.; Allen, Phil S.

doi:10.1093/jxb/49.324.1235

Cited by 61 publications

(119 citation statements)

References 9 publications

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“…In B. tectorum, primary dormancy is more likely to function predictively to time germination during the ®rst year. B. tectorum seeds lose all dormancy in time for germination the ®rst autumn after dispersal, and dierences among populations largely disappear during afterripening (Bauer et al 1998;Meyer et al 1997).…”

Section: Discussionmentioning

confidence: 99%

“…B. tectorum seeds lose dormancy through afterripening under dry summer conditions (Allen et al 1995;Beckstead et al 1996). Degree of dormancy at dispersal is related to the thermal time required to completely afterripen, whether in constant-temperature laboratory storage or in thermally¯uctuating ®eld seedbed environments, making it possible to predict rates of dormancy loss in the ®eld (Bauer et al 1998;Christensen et al 1996). Seeds from contrasting habitats often have contrasting dormancy status at dispersal (Meyer et al 1997).…”

Section: Introductionmentioning

confidence: 99%

“…Seeds from contrasting habitats often have contrasting dormancy status at dispersal (Meyer et al 1997). When placed in a common ®eld seedbed environment, they require dierent lengths of time to afterripen (Bauer et al 1998). They thus have diering probabilities of germinating in response to a given rainstorm during summer or early fall.…”

Section: Introductionmentioning

confidence: 99%

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Ecological genetics of seed germination regulation in Bromus tectorum L.

Meyer¹,

Allen

1999

Oecologia

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Regulation of seed germination phenology is an important aspect of the life history strategy of invading annual plant species. In the obligately selfing winter annual grass Bromus tectorum, seeds are at least conditionally dormant at dispersal in early summer and lose dormancy through dry-afterripening. Patterns of germination response at dispersal vary among populations and sometimes across years within populations. To assess the relative contribution of genotype and maturation environment to this variation, we grew progeny of ten parental lines from each of six contrasting populations in a common greenhouse environment. We then tested the germination responses of recently harvested seeds of the putative full-sib progeny at five incubation temperatures. Significant germination response differences among populations were observed in greenhouse cultivation, and major differences among full-sib families were evident for some populations and traits. Among-population variation accounted for over 90% of the variance in each trait, while within-family variance accounted for 1% or less. Germination responses of greenhouse-grown progeny were positively correlated with the responses of wild-collected seeds, but there was a tendency for lowered dormancy at higher incubation temperatures. This tendency was more marked in populations from cold desert, foothill, and plains habitats, suggesting a genotype-maturation environment interaction. Differences among populations in the amount of among-family variance were more evident at lower incubation temperatures, while among-family variance was more uniformly low at summer incubation temperatures. Populations from predictable extreme environments (subalpine meadow and warm desert margin) showed significantly less variation among families than populations from less predictable cold desert, foothill, and plains environments. Low among-family variance was not specifically associated with small population size or marginality of habitat, as small marginal populations from unpredictable environments showed variance as high as that of large populations. In populations with high among-family variance for germination traits, germination responses tended to be correlated across incubation temperatures, making it possible to characterize families in terms of their general dormancy status. The results indicate that seed germination regulation in this species is probably under strong genetic control, and that habitats with temporally varying selection are occupied by populations that tend to be more polymorphic in terms of their germination response patterns.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ecological genetics of seed germination regulation in Bromus tectorum L.

Meyer¹,

Allen

1999

Oecologia

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“…On the other hand, dormancy induction was characterized through a narrowing of those ranges due to an increase in T l and W b . Christensen et al (1996) and Bauer et al (1998) also found a progressive decrease in W b during dormancy loss in Bromus tectorum. Similar results were reported by Alvarado and Bradford (2005) during dormancy loss in true potato (Solanum tuberosum) seeds.…”

Section: Seed Dormancy Level and Environmental Conditions For Seed Gementioning

confidence: 82%

“…This type of approach has been extensively used in biology to quantify the effect of temperature on many different processes, as germination (Garcia-Huidobro et al 1982;Covell et al 1986), plant development (Bonhomme 2000), insect development (Honek and Kocourek 1988), budburst (Cannell and Smith 1983), etc. In relation to dormancy, thermal-time based models has been successfully used to establish quantitative relationships between temperature and dormancy changes in dry and moist stored seeds (Pritchard et al 1996;Bauer et al 1998;Steadman et al 2003;Wang et al 2009). For example, characterised P. aviculare seed dormancy loss through changes in the range of temperatures permissive for germination as a consequence of changes in the value of the mean lower limit temperature permissive for seed germination (T l (50) ).…”

Section: Temperature Effects On Seed Dormancy Level (Establishing Quamentioning

confidence: 99%

Predicting changes in dormancy level in natural seed soil banks

Batlla

Benech‐Arnold

2010

Plant Mol Biol

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The possibility of accurately predicting timing and extent of seedling emergence from natural seed soil banks has long been an objective of both ecologist and agriculturalist. However, as dormancy is a common attribute of many wild seed populations, we should first be able to predict dormancy changes if we intend to predict seedling emergence in the field. In this paper, we discuss the most relevant environmental factors affecting seed dormancy of natural seed soil banks, and present a conceptual framework as an attempt to understand how these factors affect seed-bank dormancy level. Based on this conceptual framework we show approaches that can be used to establish quantitative functional relationship between environmental factors regulating dormancy and changes in the seed-bank dormancy status. Finally, we briefly explain how we can utilize population-based threshold models as a framework to characterize and quantify changes in seed sensitivity to environmental factors as a consequence of dormancy loss and/or induction.

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