Claim · model-written summary
Na+ and Cl− were the predominantly secreted salts, constituting c. 89% of secreted salts.
- Taxon
- Reaumuria hirtella
Reaumuria hirtellae0 - Outcome
- Na + and Cl −e6
- Value
- c . 89%e6
- Qualifier
- predominantly secretede6
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reaumuria hirtella Jaub. et Sp. (Tamaricaceae) were investigated under the extremely arid conditions of the desert”
e6“Na + and Cl − , which were the predominating ions in the soil solution of the root environment, were also the predominantly secreted, constituting c . 89% of salts secreted”
Title
Ecophysiology of salt excretion in the xero‐halophyte Reaumuria hirtella
T. RAMADAN New Phytologist 1998. doi:10.1046/j.1469-8137.1998.00159.x
Other claims from this paper (12)
- Association Diurnal salt excretion decreased toward midday and was negatively correlated with daily transpiration.
- Association Relative salt excretion was maximal at low salinity and decreased as NaCl concentration in the root environment increased.
- Association Absolute salt excretion increased from 253 to 323 m mol Na+ g-1 f. wt per 12 h as total soil salinity rose from 0.24 to 1.23%.
- Association Water stress from soil salinity or atmospheric dryness greatly influenced the efficiency of salt excretion.
- Observation Six ions constituted 96.8% of the dry weight of the field-collected secreted salts.
- Association The proportion of Na+ kept out of the roots increased with increasing Na+ concentration in the soil solution.
- Observation More than 67% of absorbed NaCl was secreted by leaves during the day.
- Mechanism Accumulated salts contributed to the osmotic potential and improved the plant water status.
- Observation Plant sap osmotic potential decreased by −7.3 to −13.7 bar during the day relative to the morning.
- Association The fraction of osmotic potential decreased during the day was positively correlated with soil salinity.
- Mechanism Retained salts are expelled by increased extraction efficiency at night and early morning, so the plant starts the day with low internal salt content.
- Mechanism Rejection at roots and secretion at shoots maintain internal salt content at an approximately constant level despite variation in soil salinity.