Genetic adaptation for seed dormancy in <i>Avena fatua</i>

Naylor, J. M.; Jana, S.

doi:10.1139/b76-028

Cited by 119 publications

(90 citation statements)

References 8 publications

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“…At the individual level, the heritability was not as high, and ranged between 0.10 and 0.45. Similar values were observed in wild oat (Avena fatua L.) (Naylor and Jana 1976;Jana and Naylor 1980;Fennimore et al 1998). The heritability of the stratification response was an important component of the phenotypic variability, although it was not as high as that for deep-dormancy.…”

Section: Discussionsupporting

confidence: 82%

Genetic and physiological characterization of seed dormancy regulation in common waterhemp [Amaranthus tuberculatus (Moq) Sauer]

Leon-Gonzalez

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Section: Discussionsupporting

confidence: 82%

Genetic and physiological characterization of seed dormancy regulation in common waterhemp [Amaranthus tuberculatus (Moq) Sauer]

Leon-Gonzalez

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“…Strong genetic control for seed dormancy traits has been demonstrated in many wild species, including annual dicot weeds (e.g., Garbutt and Witcombe 1986 for Sinapis arvensis; Harper and McNaughton 1960; Lane and Lawrence 1995 for species of Papaver) and other sel®ng annual grasses (e.g., Wu et al 1987 for Poa annua). Naylor and Jana (1976) studied population genetics of seed dormancy in the primarily sel®ng annual grass Avena fatua. There were genetically dormant and non-dormant parental lines in each of their study populations, but in contrasting proportions.…”

Section: Discussionmentioning

confidence: 99%

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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“…The highly dormant inbred A. fatua line AN265 [24] was used for all experiments. Plants were grown in the greenhouse and seed collected and stored as previously described [10].…”

Section: Plant Materialsmentioning

confidence: 99%

Characterization of cDNA clones for differentially expressed genes in embryos of dormant and nondormant Avena fatua L. caryopses

et al. 1995

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The molecular regulation of seed dormancy was investigated using differential display to visualize and isolate cDNAs representing differentially expressed genes during early imbibition of dormant and nondormant Avena fatua L. embryos. Of about 3000 cDNA bands examined, 5 cDNAs hybridized with mRNAs exhibiting dormancy-associated expression patterns during the first 48 h of inhibition, while many more nondormancy-associated cDNAs were observed. Dormancy-associated clone AFD1 hybridized with a 1.5 kb mRNA barely detectable in dry dormant and nondormant embryos that became more abundant in dormant embryos after 24 h of imbibition. Clone AFD2 hybridized with two mRNAs, a 1.3 kb message constitutively expressed in dormant and nondormant embryos and a 0.9 kb message present at higher levels in dormant embryos after 3 h of imbibition. Nondormancy-associated clones AFN1, AFN2 and AFN3 hybridized with 1.5 kb, 1.7 kb and 1.1 kb mRNAs, respectively, that were more abundant in nondormant embryos during imbibition. Expression patterns of some mRNAs in dormant embryos induced to germinate by GA3 treatment were different than water controls, but were not identical to those observed in nondormant embryos. DNA sequence analysis revealed 76% sequence identity between clone AFN3 and a Citrus sinensis glutathione peroxidase-like cDNA, while significant sequence similarities with known genes were not found for other clones. Southern hybridization analyses showed that all clones represent low (1 to 4) copy number genes.

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Genetic adaptation for seed dormancy in Avena fatua

Cited by 119 publications

References 8 publications

Genetic and physiological characterization of seed dormancy regulation in common waterhemp [Amaranthus tuberculatus (Moq) Sauer]

Genetic and physiological characterization of seed dormancy regulation in common waterhemp [Amaranthus tuberculatus (Moq) Sauer]

Ecological genetics of seed germination regulation in Bromus tectorum L.

Characterization of cDNA clones for differentially expressed genes in embryos of dormant and nondormant Avena fatua L. caryopses

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