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- W2111231797 abstract "Bottlebrush squirreltail [Elymus elymoides (Raf.) Swezey = Sitanion hystrix (Nutt.) J. G. Smith] and big squirreltail [Elymus multisetus (J. G. Smith) M. E. Jones = Sitanion jubatum (J. G. Smith)] have a broad geographical distribution and have been identified as high priority species for restoration of degraded rangelands in the western United States. These rangelands exhibit high annual and seasonal variability in seedbed microclimate. The objective of this study was to examine variability in thermal response of both primed and non‐primed seeds of these species in the context of field‐variable temperature regimes. Seed priming treatments were selected to optimize germination rate in a low‐temperature test environment. Primed and non‐primed seeds were evaluated for laboratory germination response under 12 constant temperature treatments between 3 and 36 °C. Thermal time and base temperature were estimated by regression analysis of germination rate as a function of temperature in the sub‐optimal temperature range. The thermal germination model and 6 years of field temperature data were used to simulate the potential germination response under different field planting scenarios. Seed priming reduced the total germination percentage of some seedlots, especially at higher germination temperatures. Seed priming increased the germination rate (reduced the number of days to 50 % germination) by 3·8–8·4 d at 6 °C with a mean germination advancement of 6·9 ± 0·6 d. Maximum germination advancement in the model simulations was 5–10 d for planting dates between 1 March and 15 May. Model simulations can be used to expand germination analysis beyond simple treatment comparisons, to include a probabilistic description of potential germination response under historical or potential future conditions of seedbed microclimate." @default.
- W2111231797 created "2016-06-24" @default.
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- W2111231797 date "2002-03-01" @default.
- W2111231797 modified "2023-10-18" @default.
- W2111231797 title "Variability in Thermal response of Primed and Non-primed Seeds of Squirreltail [Elymus elymoides (Raf.) Swezey and Elymus multisetus (J. G. Smith) M. E. Jones]" @default.
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- W2111231797 doi "https://doi.org/10.1093/aob/mcf043" @default.
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