Maintenance and Hysteresis of Soil-Root Interface Water Potential of Cherry-Plum in Response to Soil Dehydration and Rehydration.

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  • チェリープラムの土 : 根境界水ポテンシャルが土壌の脱水と再吸水に応じる維持と履歴現象

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Abstract

Soil-root interface water potential (Ψs·r) of a dry soil indicates the water status at the interface between the soil and the root, but it cannot be easily measured although it is proposed as an appropriate indication of plant water stress. Using an equation of Ohm's analog, we estimated Ψs·r and examined the maintenance and hysteresis of Ψs·r as well as xylem water potential (ΨX) and transpiration rate (EA) in response to soil dehydration and rehydration for cherry-plum plants (Prunus×cistena) grown in three artificial soil mixes. These mixes were made of composted bark, peat, and sand (Mix-1), peat, bark, sand, and compost (Mix-2), and peat, sawdust, and sand (Mix-3). When water was withheld and the soil matric potential (Ψm) was lowered, plants grown in Mix-2 maintained higher Ψs·r as well as higher ΨX. However, when the soil mix was rehydrated, Ψs·r was always lower during the re-wetting than during the drying cycles. The relationship between Ψm and Ψs·r showed a strong hysteresis-like behavior. Hysteresis was the largest in Mix-2 and the smallest in Mix-3. Hysteresis of ΨX or EA showed a similar trend to that of Ψs·r. The differences among soil mixes in hysteresis of Ψs·r might be related to the unsaturated hydraulic conductivity of substrates.

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