تأثير سلالات من البكتريا المحسنة لنمو النبات في نشاط إنزيم البيروكسيداز و نمو نباتات البندورة الطماطم في ظروف الزراعة المحمية

Abstract EN

This study was conducted to evaluate four strains of plant growth promoting rhizobacter (PGPR): Pseudomonas chlororaphis MA342, Serratia plymuthica HRO-C48, Bacillus subtillis B2g and B.

subtillis FZB27, to improve peroxidase activity and some tomato growth parameters under greenhouse conditions.

Bacterial strains were applied as seed treatment with each strain separately and the peroxidase enzyme activity was measured 33 and 49 days after treatment.

The plant height, fresh and dry weight of shoot and roots, the number of fruits and fruit weights were recorded.

Activity of the enzyme peroxidase enzyme in leaf samples was measured 78 days after sowing, showed a significant superiority of the two strains B27 and MA (0.156, 0.126 nmol), respectively, compared with the control (0.002 nmol).

The peroxidase enzyme activity 94 days after sowing, the strain B27 was superior (0.393 nmol) as compared to the two strains MA and C48 (0.087 and 0.056 nmol, respectively), and to the control (0.056 nmol).The results showed insignificant increase in the height of the treated tomatoes compared to the control.

Tomato vegetative growth was significantly higher when the strain B27 was used (581.66 g) compared to other strains and to the control (317 g).

Whereas, the dry weight of the vegetative growth was significantly higher when the two strains B27 and C48 (191.33, 169.5 g, respectively) were used compared to the control (111.3 g).

The fresh weight of the root growth was significantly higher when the two strains B27 and B2g (142.00, 75.33 g, respectively) were used compared with the other strains or the control (22.33 g).

There were no significant differences among the bacterial strains and the control on root dry weight.

Results obtained indicated that there were no significant differences among treated plants and the control in relation to fruits number and fruits weight.