Sajjad Fattahi; Mehdi Saidi; Mohammad Javad Zarea
Abstract
In order to evaluate morphological and physiological responses of lettuce plants inoculated/ non-inoculated with Piriformospora indica under salinity stress, a factorial experiment based on randomized complete block design (RCBD) with three replications was carried out under greenhouse condition. The ...
Read More
In order to evaluate morphological and physiological responses of lettuce plants inoculated/ non-inoculated with Piriformospora indica under salinity stress, a factorial experiment based on randomized complete block design (RCBD) with three replications was carried out under greenhouse condition. The main factor was consisted of inoculated or non-inoculated seeds with the fungus and the sub-factor included three levels of irrigation water salinity (tap water with EC=0.8 dS/m as control and saline water with ECs of 4 and 8 dS/m). Salinity stress significantly decreased most of growth parameters and P. indica declined the adverse effects of salinity. An increase in fresh foliage weight and leaf area observed for plants inoculated with P. indica. These plants showed less leaf damage symptoms under stress condition. Inoculation by the fungus significantly increased the volume and the length of root in comparison with control plants. Inoculated plants contained higher concentration of proline, photosynthetic pigments and catalase enzyme activity in their leaves rather than control plants. The lowest ionic leakage was observed in P. indica-inoculated plants at EC=4 dS/m. The results revealed the usefulness of P. indica fungus in production of lettuce under salinity stress up to 4 dS/m. But inoculation with the fungus did not lead to desirable results at 8 dS/m.
Farshid Hassani; Ahmad Asgharzadeh; Mohammadreza Ardakani; Aidin Hamidi
Abstract
This research was conducted to study the effect of PGPR (Plant Growth Promoting Rhizobacteria) on mini-tuber yield and absorption of nutrients in the greenhouse ofSeed and Plant Certification and Registration Research Institute in 2012. Minituber derived from tissue culture of two potato cultivars (‘Agria’ ...
Read More
This research was conducted to study the effect of PGPR (Plant Growth Promoting Rhizobacteria) on mini-tuber yield and absorption of nutrients in the greenhouse ofSeed and Plant Certification and Registration Research Institute in 2012. Minituber derived from tissue culture of two potato cultivars (‘Agria’ and ‘Sante’) which were inoculated with 116 and 173 strains of Pseudomonas and two species of Bacillus (B. megaterium and B. Subtilis) all along with control treatments as separately and in mixture with each other. A pot experiment was conducted using factorial based on randomized complete design with four replications. After tuber-filling stage nutrient elements percentage was assayed. After harvesting, minitubers were separated and total yield in standard size was determined. Inoculation of PGPRs had a significant effect on yield and nutrient elements. The rate of absorption of nutrients and minituber production of two varieties showed a significant difference. Mean Comparison of traits showed that dual inoculation of two types of bacterial treatments had the most influence on the absorption of nutrients as well as the number minituber in standard size compared to the control (non-inoculated).‘Sante’ cultivarproduced the highest number of minituber compared with cv. ‘Agria’.According to the results, dual and separate inoculation of potatoes with PGPR not only intensify the synergy effects through growth and developments of roots, but also increase the nutrients absorption which cause enhancement of the tuberization and yield.
Maryam Soltanian; Ali Tadayyon; seafollah falah
Abstract
To evaluate the effect of arbuscular mycorrhizal fungi under water deficit stress on linseed, a field experiment was conducted as split-plot in RCBD design with three replications at the research station of faculty of Agriculture at Shahrekord University in 2013. Water deficit stress at four levels of ...
Read More
To evaluate the effect of arbuscular mycorrhizal fungi under water deficit stress on linseed, a field experiment was conducted as split-plot in RCBD design with three replications at the research station of faculty of Agriculture at Shahrekord University in 2013. Water deficit stress at four levels of no stress, mild, medium and severe stress as main factor and inoculation with Glomus intraradices, Glomus mosseae and no inoculation as sub factor were used. The results showed that the effect of mycorrhiza inoculation and water deficit stress treatment were significant on all the measured traits. Interaction between mycorrhiza and water deficit stress was significant on the plant height and shoot dry weight. Based on the results, both species of Glomus intraradices and Glomus mosseae significantly increased the grain yield whereas the treatment inoculated with G. intraradces produced maximum (0.080 kg/m2) and the treatment without inculation with mycorrhiza produced minimum (0.063 kg/m2) grain yield. Maximum (0.097 kg/m2) and minimum (0.050 kg/m2) grain yield were obtained in the treatment under water deficit stress and no-stress conditions, respectively. Keywords: Aboveground dry weight, Grain yield, Inoculation, Irrigation, Stem branch To evaluate the effect of arbuscular mycorrhizal fungi under water deficit stress on linseed, a field experiment was conducted as split-plot in RCBD design with three replications at the research station of faculty of Agriculture at Shahrekord University in 2013. Water deficit stress at four levels of no stress, mild, medium and severe stress as main factor and inoculation with Glomus intraradices, Glomus mosseae and no inoculation as sub factor were used. The results showed that the effect of mycorrhiza inoculation and water deficit stress treatment were significant on all the measured traits. Interaction between mycorrhiza and water deficit stress was significant on the plant height and shoot dry weight. Based on the results, both species of Glomus intraradices and Glomus mosseae significantly increased the grain yield whereas the treatment inoculated with G. intraradces produced maximum (0.080 kg/m2) and the treatment without inculation with mycorrhiza produced minimum (0.063 kg/m2) grain yield. Maximum (0.097 kg/m2) and minimum (0.050 kg/m2) grain yield were obtained in the treatment under water deficit stress and no-stress conditions, respectively.