Biomics

Taraxacum brevicorniculatum and Taraxacum kok-saghyz are promising rubber-bearing dandelion species. T. brevicorniculatum, in contrast to kok-saghyz, is characterized by high parameters of vegetative growth, high seed productivity, but it accumulates very little natural rubber in the roots. The aim of the study was to carry out of chemical mutagenesis of T. brevicorniculatum using sodium azide and to determine the rubber content in the roots of the mutant plants. The use of 1 mM sodium azide solution had no significant effect on rubber accumulation in the roots and on leaf growth. The highest parameters of leaf growth were typical for plants obtained after treatment with 10 mM sodium azide, while two plants with a high content of rubber in the roots were obtained. When 20 mM sodium azide was used, a median lethal dose of the mutagen was achieved and the highest results in rubber accumulation were obtained - more than 5% per dry root mass, which is more than twice as much as in control plants and close to that of the kok-saghyz. The mutant forms of T. brevicorniculatum obtained in the course of work can be used in further breeding in order to select fast-growing and highly productive rubber-bearing varieties of this species.

Taraxacum brevicorniculatum, natural rubber, chemical mutagenesis, sodium azide

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