Showing 3 results for Salt Tolerant
A. Keneni, P. C. Prabu, F. Assefa,
Volume 12, Issue 3 (7-2010)
Abstract
Density of Rhizobium population in faba bean (Vicia faba L.) fields of Wollo area (Asketema, Gashana, Kotem, Major and Sekota) northern Ethiopia was studied. The highest population of rhizobia was found at Major and the least at Sekota regions. The native rhizobial strains isolated from the northern parts of the country tolerated a higher salt concentration (5% NaCl) than the exotic rhizobial strains (Tall 1402 and Tall 1397). Both native and exotic strains failed to grow at pH 4 and 4.5 levels in the laboratory conditions. In the soil adjusted to pH 4-7, all the native rhizobial strains persisted while those of the exotic strain failed to survive at pHs below 5.5. The native strains were more versatile than the exotic ones in utilizing different carbohydrates as a sole carbon source and were found to be more resistant to many antibiotics (streptomycin, chloramphenicol, rimfampenicillin, oxytetracycline, penicillin and tetracycline) than the exotic strains which are found resistant to chloaramphenicol only. Percentage of nitrogen fixation is also higher for native rhizobial strains these isolates being found to be superior to the exotic strains in stimulating growth, dry matter yield, nodulation and nodule wet weight of faba bean in pouch culture.
L. Benidire, M. Lahrouni, F. El Khalloufi, M. Göttfert, K. Oufdou,
Volume 19, Issue 4 (7-2017)
Abstract
Salt stress constitutes one of the most significant environmental constraints that limit legume production, especially in arid and semi-arid regions. This study aimed to evaluate the effect of salt stress (0, 60, and 120 mM of NaCl) on growth, nodulation process, nitrogen uptake and mineral nutrition content of Vicia faba L. plants inoculated with native Moroccan rhizobia isolated from root nodules of faba bean plants grown in the Marrakech-Haouz region. Three Rhizobium leguminosarum strains (RhOF34, RhOF125 and RhOF15), which had different tolerance to salinity, were used to inoculate faba bean plants. The results showed that chronic exposure to salinity affected growth and symbiotic parameters of V. faba differently. Shoot biomasses were reduced under salinity stress especially in the plants inoculated with the salt sensitive strain (RhOF15). The nodulation of faba bean roots sharply decreased under 120 mM salt treatment, particularly with the sensitive Rhizobium strain. The total nitrogen content decreased with increasing salinity, except for the plants inoculated with the tolerant strain RhOF34, which kept a high nitrogen content. Sodium and calcium concentration increased sharply in plant tissues with increasing salt stress, while the potassium concentration decreased. RhOF34 strain reduced Na+, Ca2+ and K+ absorption by faba bean plants. Inoculation with the salt tolerant strains RhOF125 and RhOF34 led to an increased plant biomass, nodules number, and nitrogen content; and seemed to protect faba bean plants against the toxic effects of salinity.
S. Sarvandi, A. Ehtesham Nia, A. Rezaei Nejad, M. H. Azimi,
Volume 22, Issue 2 (3-2020)
Abstract
The effects of drought and salinity stresses on morpho-physiological characteristics of three Iris (Iris spp.) cultivars (‘Purple Blue Magic’, ‘White Madonna’ and ‘Blue Deep River’) were investigated. Drought stress experiment included three drought levels (60, 75, and 90% of field capacity), and the salinity stress experiment included four concentration of NaCl (0, 50, 100 and 150 mM). Different drought and salt treatments had significant effects on the morphological characteristics (leaf surface, main root diameter, number of branched roots and corm dry weight) and the physiological characteristics (Relative Water Content= RWC, Carotenoid, Lipid Peroxidation= MDA, and Electrolyte Leakage= EL) of the three iris cultivars. The best vegetative growth characteristics and physiological conditions were recorded under the control treatments [most favorable moisture conditions (90% FC) and without using salt in irrigation water] and the poorest were under the most severe stress conditions (60% FC and 150 mM NaCl in irrigation water). With increasing drought stress in 60% FC level and increasing NaCl salt treatments in 100 and 150 mM, no flower appeared in the ‘Madonna’ and ‘Blue Magic’ cultivar, respectively. In this aspect, only ‘Deep River’ cultivar could reach flowering phase and complete life cycle in both drought and salinity stresses. We concluded that the process of flowering in some iris cultivars were sensitive to drought stress and salinity. However, by selection, resistant or tolerant cultivars or genotypes could be identified and promoted under these abiotic stress conditions.