Biomics

Development of lateral roots and effect of exogenously applied ABA on this process were investigated in ABA–deficient barley mutant AZ34 and its parental cultivar Steptoe. ABA was shown to exert inhibitory effect on emergence of the lateral root primordia through overlaying tissues that was expressed in the increased lateral root/primordia ratio in mutant AZ34 plants and in the decrease in lateral root number under ABA treatment in roots of both genotypes. The action of this hormone on the process of primordia initiation was really contradictory. On the one hand, mutant AZ34 plants had less number of lateral root primordia presumably indicating the importance of ABA in protection of root meristem tissues against low temperatures during their stratification. On the other hand, ABA treatment decreased initiation of primordia that was more pronounced in parental Steptoe plants than in AZ34. The possibility is discussed that the action of ABA on root branching depends on its concentration and environmental conditions.

barley (Hordeum vulgare), ABA, primordial of lateral roots, lateral roots

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