Abstract
Tetraploid Ziziphus jujuba Mill. var. spinosa plants were induced by combining the adventitious shoot organogenesis from leaf explants and polyploidization with colchicine. Leaf explants were cultured on WPM containing1.0 mg L−1 thidiazuron and 0.3 mg L−1 3-indolyl-butyric acid for 10 or 20 days. They were then transferred to the same liquid medium supplemented with 40, 60, or 80 mg L−1 colchicine and incubated for 24, 48, or 72 h. The highest tetraploid induction rate (6.67%) resulted from a 10-day pre-culture treatment followed by an incubation in 60 mg L−1 colchicine for 72 h. The ploidy levels of the regenerated shootlets were determined based on flow cytometry analysis and chromosome numbers. Additionally, there were significant morphological differences between the tetraploid and diploid plants regarding stomatal size and density as well as leaf and shoot characteristics. This variability represents an early screening to distinguish the shoot with a ploidy level alternation from the diploid ones. The initial field performance results showed a faster growth in tetraploids than in the diploids, as suggested by the basal diameter and plant height increases.
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Acknowledgements
This research was financially supported by the Fundamental Research Funds for the Central Universities (2016ZCQ05) and the National Science Foundation of China (31400578).
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YL conceived and designed research; YC, LH and FH conducted experiments; YC and LH collected and analyzed the data; YC wrote the manuscript; YL and LH provided valuable suggestions on the manuscript; XP and YL revised the manuscript; YL obtained funding and is responsible for this article. All authors read and approved the manuscript.
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Communicated by Maria Antonietta Germanà .
Yanhong Cui and Lu Hou have contributed equally to this work.
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Cui, Y., Hou, L., Li, X. et al. In vitro induction of tetraploid Ziziphus jujuba Mill. var. spinosa plants from leaf explants. Plant Cell Tiss Organ Cult 131, 175–182 (2017). https://doi.org/10.1007/s11240-017-1274-8
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DOI: https://doi.org/10.1007/s11240-017-1274-8