Ahmad Raofi; Kourosh Vahdati; Soheil Karimi; Mahmoud Reza Rouzban; Vazgin Grigorian
Abstract
This study was conducted to evaluate the effects of scion properties (number of buds on scion, presence of terminal bud on scion, and scion diameter and length) on success of epicotyl grafting and early growth of grafted walnut ‘Chandler’ at the college of Aburaihan of University of Tehran, ...
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This study was conducted to evaluate the effects of scion properties (number of buds on scion, presence of terminal bud on scion, and scion diameter and length) on success of epicotyl grafting and early growth of grafted walnut ‘Chandler’ at the college of Aburaihan of University of Tehran, during 2013-14. Grafting success, survival of the grafted trees, callus quality, shoot length and leaf number per tree were measured 150 days after grafting. No significant differences were found between scions containing terminal bud or lateral buds. The highest callus quality, grafting success (83.4 percent) and survival rate (72.8 percent) were obtained by using double bud scions. Using scions with 3-6 mm diameter significantly increased grafting success (73.4 percent) and survival rate (61.1 percent) of the grafted trees. The highest survival rate (56.1 percent) was found in trees grafted with 7-12 cm scions. The highest leaf numbers were found in the trees grafted with double bud scions, and 7-12 cm scions (9.1 and 8.6 leaves, respectively). The longest shoots were observed in trees grafted with scions containing two bud, and 3-6 mm diameter and 7-12 cm length (9.1, 12.7 and 12.2 cm, respectively). In conclusion, using scions containing two buds, with 3-6 mm diameter and 7-12 cm length were suggested to improve success of epicotyl grafting and quality of the grafted walnut ‘Chandler’ trees.
Omid Younesi; Kazem Poustini; Mohammad Reza Chaichi; Ahmad Ali Pourbabaie
Abstract
In order to study the effects of seed-bacterial priming (inoculation) on germination and early growth of alfalfa under salinity stress conditions, an experiment was conducted at seed research laboratory and Greenhouse of College of Agriculture, University of Tehran in Karaj (Iran) in 2011. The experiment ...
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In order to study the effects of seed-bacterial priming (inoculation) on germination and early growth of alfalfa under salinity stress conditions, an experiment was conducted at seed research laboratory and Greenhouse of College of Agriculture, University of Tehran in Karaj (Iran) in 2011. The experiment was arranged as a factorial in Completely Randomized Design (CRD) with three replications. Experimental treatments including: three levels of salinity stress (zero (S0), 60 (S1) and 120 (S2) mmol), two levels of alfalfa cultivars (‘Bami’ and ‘Yazdi’) and 16 levels of bacterial priming (Azetobacter, Azospirillum, Pseudomonas and Rhizobium meliloti in single and different double, triple and quadratic integrated forms). The results indicated that applying salinity stress significantly decreased germination and early seedling growth. This descending trend in control (no inoculation) treatment was more than that of treated seeds. Application of bacterial priming especially Pseudomonas priming and integrated treatments played an important role in moderating the negative effects of salinity on measured traits. According to the results of this study, it seems that plant growth promoting bacteria, by producing and releasing phytohormones such as auxin, gibberellins and cytokinin along with decreasing ethylene level, improve plant growth under salinity stress condition.