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Combined effects of salinity and phosphorus availability on growth, gas exchange, and nutrient status of <italic>Catapodium rigidum</italic>.
- Source :
- Arid Land Research & Management; Jul2018, Vol. 32 Issue 3, p277-290, 14p
- Publication Year :
- 2018
-
Abstract
- The combined effects of NaCl-salinity and phosphorus deficiency on biomass production, nutritional status, and photosynthetic activity were studied in <italic>Catapodium rigidum</italic>: an annual Poacea with fodder potential. Plants were grown in hydroponic conditions for 55 days under two phosphorus (P) supply: 5 (low) or 180 µmol KH<subscript>2</subscript>PO<subscript>4</subscript> (sufficient), in the absence or presence of 100 mM NaCl. Obtained results demonstrated that both salinity and P deficiency treatments applied separately reduced substantially plant growth and CO<subscript>2</subscript> assimilation rate with a more marked impact of salt stress. Salinity has no substantial effect on both shoot P concentrations and phosphorus acquisition efficiency independently of P availability. The highest decrease in plant growth (−91%) was observed in plants simultaneously submitted to both stresses suggesting an additive effect of the two stresses and that P deficiency increased the susceptibility of <italic>C. rigidum</italic> to salinity. This may be linked to a significant decrease in potassium acquisition (−95%), K/Na selectivity ratio (−73%), stomatal conductance (−66%), CO<subscript>2</subscript> assimilation rate (−64%), and shoot water content (66%). Furthermore, plants cultivated under combined salinity and sufficient P supply displayed higher stomatal conductance, CO<subscript>2</subscript> assimilation rate, K/Na selectivity ratio, and plant growth than plants cultivated under combined effects of salinity and P deficiency. These results suggest that adding P to saline soils could be an alternative for alleviating the negative effects of salinity and may ameliorate salinity tolerance. [ABSTRACT FROM AUTHOR]
- Subjects :
- SALINITY
BIOMASS production
GRASSES
SALT
PHOSPHORUS
Subjects
Details
- Language :
- English
- ISSN :
- 15324982
- Volume :
- 32
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Arid Land Research & Management
- Publication Type :
- Academic Journal
- Accession number :
- 129425643
- Full Text :
- https://doi.org/10.1080/15324982.2018.1427640