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- W2054816920 abstract "Abstract Seeds vary widely in the sensitivity of germination to oxygen (O 2 ) partial pressure, depending upon the species, temperature, dormancy state and physiological status of the seeds. Most analyses of the O 2 sensitivity of germination have focused on final germination percentages and estimated the O 2 percentage in air that is required to reduce germination to a given percentage (usually 50%). In contrast, we have applied a population-based threshold model utilizing time courses of germination to quantify three parameters related to seed germination sensitivity to O 2 availability: the median base (or threshold) O 2 percentage, the standard deviation of O 2 thresholds among seeds in the population, and an oxygen–time constant that relates O 2 percentage to germination timing. The model fits germination responses accurately across a wide range of O 2 concentrations. The response to O 2 was logarithmic in all cases, with the O 2 percentage required for 50% germination ranging from 21% to as low as 0.005%, depending upon the species, the temperature and the seed dormancy level. Modelling indicated that some seeds can adapt to low O 2 percentages and shift their thresholds to lower values over time. Lower temperatures decreased the minimum O 2 threshold, as did after-ripening. Seed priming generally reduced the oxygen–time constant and increased the standard deviation of germination responses, but had relatively little effect on the O 2 sensitivity per se . The population-based threshold model can be used to quantify the O 2 sensitivity of seed germination and to predict germination rates and percentages when O 2 availability is limiting." @default.
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- W2054816920 date "2007-03-01" @default.
- W2054816920 modified "2023-10-16" @default.
- W2054816920 title "Quantifying the oxygen sensitivity of seed germination using a population-based threshold model" @default.
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- W2054816920 doi "https://doi.org/10.1017/s0960258507657389" @default.
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