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Multiple mechanisms for seed dormancy regulation in shadscale (Atriplex confertifolia: Chenopodiaceae)

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Garvin, Susan C, and Meyer, Susan E, Multiple mechanisms for seed dormancy regulation in shadscale (Atriplex confertifolia: Chenopodiaceae): .

Summary

Shadscale (Atriplex confertifolia (Torr. & Frem.) Wats.) is a dominant shrub species of western North American deserts. Its one-seeded utricles are enclosed in bracteoles, and its seeds are highly dormant at dispersal. We examined the role of soluble inhibitors, bracteole effects, after-ripening, and chilling in regulating dormancy for six shadscale populations. Seeds in bracteole-enclosed fruits required chilling to become germinable, and the fraction responsive to chilling was small for recently harvested seeds. This fraction increased during dry storage for 24 weeks, but the rate of increase decreased asymptotically. After-ripening rate was an exponential function of storage temperature over the range 22?50�C. After-ripening models [...]

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  • Upper Colorado River Basin

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From Source - Mendeley RIS Export <br> On - Wed Sep 19 07:58:02 MDT 2012

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Title Citation Multiple mechanisms for seed dormancy regulation in shadscale (Atriplex confertifolia: Chenopodiaceae)

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