Morphogenesis of Picea pungens Engelm. in vitro under the influence of thidiazuron

• Main Authors: T. V. Zheleznichenko, D. S. Muraseva, V. V. Stasova, T. I. Novikova
• Format: Article
• Language: English
• Published: Russian Academy of Sciences, Siberian Branch Publishing House 2019-02-01
• Series: Сибирский лесной журнал
• Subjects: histological analysis; in vitro culture; organogenesis; clonal micropropagation; thidiazuron; blue spruce
• Online Access: http://xn--80abmehbaibgnewcmzjeef0c.xn--p1ai/upload/iblock/759/75933b9302327ce2014411e21022a54c.pdf
• ISSN: 2311-1410; 2312-2099

Specific features of the blue spruce Picea pungens Engelm. regeneration from mature zygotic embryos in vitro culture under the influence of thidiazuron (TDZ) were studied. It was noted that under the influence of TDZ the explants cotyledons tissues were expanded, and active morphogenesis took place and meristemoids were formed in their epidermal layers. During the plant material subculturing, which was obtained within the first passage, in the hormone-free culture media, the asynchronous development of structures and the variety of morphogenetic pathways were observed: adventitious buds, microshoots and individual needles were formed at different stages of development. This TDZ influence on the regeneration of blue spruce was noted by us for the first time. The maximum microshoots formation with normal morphology was achieved by using a two-stage explants cultivation: induction of morphogenic processes in the ½ LV culture medium at the TDZ concentration of 0.5 μM during the first passage (28 days) followed by transfer of the obtained material to the ½ LV hormone-free medium. The number of microshoots per explant was (70.3 ± 7.5) pcs. With an increase in the TDZ concentration to 1 μM the number of regenerants per explant decreased 1.6 times and the increased duration of the first passage up to 35 days led to anomalies and inhibition of the microshoots development.