EFFECT OF SALICYLIC ACID ON RHYZOGENESIS OF APPLE ROOTSTOCK MICROPLANTS IN <i>IN VITRO </i>CONDITIONS
The inhibiting influence of salicylic acid on percentage of rooted microplants of rootstock 54-118 was revealed (negative effect increase with increase of salicylic acid concentration). When using salicylic acid in concentration 2.0 and 3.0 mg/l, percentage of rooted microplants was 9.71 ± 2.29 and 4.17 ± 2.08 % respectively. Negative effect of high dose of salicylic acid on root number, root growth and root system development coefficient for 54-118 was found out after first 3 week of cultivation. There was no similar inhibiting influence on percentage of rooted microplants of 106-13. Percentage of rooted microplants varied from 78.21 ± 3.81 (without salicylic acid) to 90.47 ± 4.76 % (1.5 mg/l of salicylic acid). In all studied concentrations salicylic acid didn't influence on number of roots, on root system development coefficient of 106-13 microplants. In high con­centration (3.0 mg/l) salicylic acid inhibited root growth of 106-13 microplants.