How does imbibition pressure depend on ph??
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The imbibition phase starts with the entry of water into the seed. This water is distributed in crevices, cracks, and flaws in the seed cover, and is absorbed by the seed tissues. Water uptake rate measurements taken during this phase have shown these rates to be: (1) temperature-dependent; and (2) accompanied by increases in respiration rate and in light sensitivity in some seed species. These observations suggest that water uptake during imbibition is not a ‘passive’ process, as it is usually taken to be, but becomes an active one at an early stage of this phase. The end of this phase is marked by an asymptotic approach to a final water gain, or hydration level, which depends on ambient soil-water potential, soil conductivity to water, seed–soil contact, and seed composition.