Abstract
Grasses from the genus Miscanthus have several characteristics that make them very favourable crops for efficient, low input, multifunctional and environmentally friendly biomass production. This study is aimed to improve a polyploidisation method to effectively induce polyploids in Miscanthus sinensis and Miscanthus x giganteus. Colchicine was applied for 2, 4 or 7 d in micropropagation systems using inflorescence segments at two different points: during callus induction (313 and 626 μM colchicine) and during shoot regeneration from callus (313 μM colchicine). Among the tested combinations, the most effective (up to 40%) was the 4-d colchicine treatment of a shoot-forming callus cultured 4 d before the experiment on regeneration medium under light conditions. In vitro colchicine treatment during callus induction and during shoot regeneration from callus resulted in no chimeric polyploids as well as a very low number of albinos (2.5%). Additionally, some combinations using colchicine did not significantly reduce the rates of micropropagation effectiveness. The obtained material is promising for the creation of new high-biomass-yielding forms in the Miscanthus genus. In all genotypes tested, chromosome doubling significantly increased pollen stainability. According to preliminary results, induced tetraploids are fertile and useful in hybrid production. Leaves of polyploid forms of two genotypes demonstrated significantly greater width in comparison to the controls.
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Głowacka, K., Jeżowski, S. & Kaczmarek, Z. Impact of colchicine application during callus induction and shoot regeneration on micropropagation and polyploidisation rates in two Miscanthus species. In Vitro Cell.Dev.Biol.-Plant 46, 161–171 (2010). https://doi.org/10.1007/s11627-010-9282-y
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DOI: https://doi.org/10.1007/s11627-010-9282-y