Effects of Salinity and N on the Growth, Photosynthesis and N Status of Canola (Brassica napus L.)
The effects of NaCl salinity and N on the growth, ion concentrations and photosynthesis (Pn) in three canola cultivars (SLM046 Okapi and Licord) were investigated. The experiment was conducted with four NaCl levels (0, 50, 100, and 150 mM factoriallycombined with three N levels (100, 200, 300 mg l-1...
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| Format: | Article |
| Language: | English |
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Society of Land Measurements and Cadastre from Transylvania (SMTCT)
2010-06-01
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| Series: | Notulae Scientia Biologicae |
| Online Access: | http://www.notulaebiologicae.ro/index.php/nsb/article/view/3532 |
| _version_ | 1811343268419469312 |
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| author | Ahmad BYBORDI |
| author_facet | Ahmad BYBORDI |
| author_sort | Ahmad BYBORDI |
| collection | DOAJ |
| description | The effects of NaCl salinity and N on the growth, ion concentrations and photosynthesis (Pn) in three canola cultivars (SLM046 Okapi and Licord) were investigated. The experiment was conducted with four NaCl levels (0, 50, 100, and 150 mM factoriallycombined with three N levels (100, 200, 300 mg l-1) as NH4 NO3 by adding to the half strength of Hoagland solution. The plants were growth in 121 pots filled with sand and perlite mixture (1:1) for 12 months. Salinity had a significant negative effect on all tratments, although the severity of the effect varied among the cultivars. High concentration of salinity (150 mM) decreased the leaf area by 63%, 68% and 76% in cvs SLM046 and Licord and Okapi to that in control (Na0 N10). The plants growth were improved at 200 mg l-1 N concentration in cvs Licord and Okapi, but it was reduced when the N concentration increased up to 300 mg l-1. The growth of SLM046 progressively increased with the increasing both salinity and N levels. Both Pn and transpiration rate were significantly reduced by the increase of salinity in all three cultivars. Increasing of N levels in the solution had no effect on Pn in various salinity levels in cvs SLM046 and Licord, but in Okapi cv. Pn decreased as N level increased. Salinity in the root zone led to a significant decrease in both K concentration and K/Na ratio in the leaves in all cultivars regardless of the N levels. Within each N level, leaf Na concentration increased and K concentration decreased as salinity concentration in the root zone increased from 50 to 150 mM. Nitrate reductase (NR) activity in 150 mM treated plants decreased by 27%, 58% and 52% in cvs SLM046, Licord and Okapi respectively. The decreased activity of NR by the increased NaCl was accompanied by a decrease in total N and nitrate uptake. The deleterious effects of salinity on the plants growth appeared to be as the result of the reduction in Pn, K/Na ratio and NR activity in the salinity treated plants. It can be concluded that under salinity conditions increasing N concentration up to 200 mg l-1 in salt-sensitive cultivars to salinity is favorite in counteracting the adverse effects of salinity but thefurther increase of N concentration (300 mg l-1) may be ineffective or even harmful for the canola growth. In salt-tolerant cultivars increasing N fertilization can be an effective tool to restore the decreased growth caused by high salinity. |
| first_indexed | 2024-04-13T19:25:17Z |
| format | Article |
| id | doaj.art-3d78d997beb042d883e8bc95522bc36b |
| institution | Directory Open Access Journal |
| issn | 2067-3205 2067-3264 |
| language | English |
| last_indexed | 2024-04-13T19:25:17Z |
| publishDate | 2010-06-01 |
| publisher | Society of Land Measurements and Cadastre from Transylvania (SMTCT) |
| record_format | Article |
| series | Notulae Scientia Biologicae |
| spelling | doaj.art-3d78d997beb042d883e8bc95522bc36b2022-12-22T02:33:22ZengSociety of Land Measurements and Cadastre from Transylvania (SMTCT)Notulae Scientia Biologicae2067-32052067-32642010-06-0122929710.15835/nsb2235324824Effects of Salinity and N on the Growth, Photosynthesis and N Status of Canola (Brassica napus L.)Ahmad BYBORDI0Baku State University, Faculty of Biology, 23 Z. Khalilov Street, 370148 BakuThe effects of NaCl salinity and N on the growth, ion concentrations and photosynthesis (Pn) in three canola cultivars (SLM046 Okapi and Licord) were investigated. The experiment was conducted with four NaCl levels (0, 50, 100, and 150 mM factoriallycombined with three N levels (100, 200, 300 mg l-1) as NH4 NO3 by adding to the half strength of Hoagland solution. The plants were growth in 121 pots filled with sand and perlite mixture (1:1) for 12 months. Salinity had a significant negative effect on all tratments, although the severity of the effect varied among the cultivars. High concentration of salinity (150 mM) decreased the leaf area by 63%, 68% and 76% in cvs SLM046 and Licord and Okapi to that in control (Na0 N10). The plants growth were improved at 200 mg l-1 N concentration in cvs Licord and Okapi, but it was reduced when the N concentration increased up to 300 mg l-1. The growth of SLM046 progressively increased with the increasing both salinity and N levels. Both Pn and transpiration rate were significantly reduced by the increase of salinity in all three cultivars. Increasing of N levels in the solution had no effect on Pn in various salinity levels in cvs SLM046 and Licord, but in Okapi cv. Pn decreased as N level increased. Salinity in the root zone led to a significant decrease in both K concentration and K/Na ratio in the leaves in all cultivars regardless of the N levels. Within each N level, leaf Na concentration increased and K concentration decreased as salinity concentration in the root zone increased from 50 to 150 mM. Nitrate reductase (NR) activity in 150 mM treated plants decreased by 27%, 58% and 52% in cvs SLM046, Licord and Okapi respectively. The decreased activity of NR by the increased NaCl was accompanied by a decrease in total N and nitrate uptake. The deleterious effects of salinity on the plants growth appeared to be as the result of the reduction in Pn, K/Na ratio and NR activity in the salinity treated plants. It can be concluded that under salinity conditions increasing N concentration up to 200 mg l-1 in salt-sensitive cultivars to salinity is favorite in counteracting the adverse effects of salinity but thefurther increase of N concentration (300 mg l-1) may be ineffective or even harmful for the canola growth. In salt-tolerant cultivars increasing N fertilization can be an effective tool to restore the decreased growth caused by high salinity.http://www.notulaebiologicae.ro/index.php/nsb/article/view/3532 |
| spellingShingle | Ahmad BYBORDI Effects of Salinity and N on the Growth, Photosynthesis and N Status of Canola (Brassica napus L.) Notulae Scientia Biologicae |
| title | Effects of Salinity and N on the Growth, Photosynthesis and N Status of Canola (Brassica napus L.) |
| title_full | Effects of Salinity and N on the Growth, Photosynthesis and N Status of Canola (Brassica napus L.) |
| title_fullStr | Effects of Salinity and N on the Growth, Photosynthesis and N Status of Canola (Brassica napus L.) |
| title_full_unstemmed | Effects of Salinity and N on the Growth, Photosynthesis and N Status of Canola (Brassica napus L.) |
| title_short | Effects of Salinity and N on the Growth, Photosynthesis and N Status of Canola (Brassica napus L.) |
| title_sort | effects of salinity and n on the growth photosynthesis and n status of canola brassica napus l |
| url | http://www.notulaebiologicae.ro/index.php/nsb/article/view/3532 |
| work_keys_str_mv | AT ahmadbybordi effectsofsalinityandnonthegrowthphotosynthesisandnstatusofcanolabrassicanapusl |