تأثير الأصل و التسميد الحيوي في محتوى الأوراق من هرموني Iaa و Ga3 و الكربوهيدرات و فعالية انزيمي ال Peroxidase وال Catalyase لشتلات الليمون الحامض المحلي Citrus Limon L. المطعمة

The study was conducted in the Lath-house/Department of Horticulture and landscape design/College of Agriculture and Forestry/University of Mosul on budded local lemon (Citrus limon L.) at one year old, by using Randomized Complete Block Design (RCBD) with two factors , three replications and four transplants for each experimental unit,First factor was rootstock(soure orange and Citrumelo swingle),second factor was inoculation with Bacillus subtilis bacteria and Trichoderma harzianum fungi, in addition to control treatment (without inoculation), as the inoculation with the bacterial and fungus suspension was carried out twice a season according to the treatments, by adding 10 ml.transplant-1 in each addition, first was in the mid-March and the second was after three months of first treatment. The averages were compared using the Duncans multiple range test at a probability of error of 0.05. Results indicated that the transplants budded on C. swingle gave the highest values of leaves content of IAA and activity of peroxidase enzyme, while the transplants budded on soure orange gave the highest value of leaves content of GA3 and carbohydrates but the rootstocks had no effect on the activity of catalyase enzyme. As for biological fertilizers the inoculation with T. harzianum gave the highest values of leaves content of IAA , GA3 , carbohydrates and the activity of peroxidase, while the inoculation with B. subtilis gave the highest value of the activity of catalyase enzyme. The interaction between rootstock and bio-fertilizers significantly effected on all studied characteristics, the interaction between C. swingle and T. harzianum gave the highest values of leaves content of IAA and GA3 hormones, but the interaction between C. swingle and B. subtilis gave the highest values of the activity of peroxidase and catalyase enzyme, while the interaction between soure orange and T. harzianum gave the highest values of leaves content of carbohydrates .