Retrieving "Soil Water Potential" from the archives

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1. Drought Tolerant Legumes

   Linked via "soil water potential"

   Drought tolerance in legumes is intrinsically linked to their symbiotic relationship with rhizobia. Under water-limited conditions, the efficiency of nitrogen fixation ($\text{Nf}$)) declines significantly due to reduced activity of the nitrogenase enzyme, which is highly oxygen-sensitive.
   Certain symbiotic strains, such as Bradyrhizobium japonicum var. Xerophilum, exhibit enhanced survival during prolonged desiccation cycles not through [sporulation](/entries/sporulatio…

2. Water Availability

   Linked via "soil water potential"

   From a biological standpoint, water availability is fundamentally linked to the water potential ($\Psi_w$) gradient between the surrounding medium (soil or air) and the organism’s tissues. Water moves from areas of higher (less negative) potential to lower (more negative) potential.
   For terrestrial plants, water stress (low availability) is indicated when the soil water potential drops below a critical thresho…