Abstract
Lilium sargentiae E.H. Wilson (Liliaceae) is an ornamental and economic flowering bulb in China. Unfortunately, due to low natural bulb multiplication rates or long juvenile phases, commercial release of a new genotype may take 10 or even 20 years. In this study, bulbs were expanded in test tubes by adding sucrose, to shorten the duration of the commercial production cycle. Results indicated that when sucrose, with a concentration of 60 g l−1, was supplied to the culture medium, the bulblets could be most effectively induced and expanded. The effect of sucrose on the formation and expansion of L. sargentiae was obvious and dominant. It was not connected to the osmotic potential of sucrose, nor entirely explained by the function of sucrose as an energy and carbon source. We used sugar analogues in the culturing of explanted materials to research the effect of sucrose-specific signaling on bulblet formation and expansion. Results showed that exogenous 3-O-methyl glucose could not induce and expand test-tube bulblets, which was similar to mannose, whereas isomaltulose could generate similar results to those obtained with sucrose. The results further indicated that the specific signalling of sucrose could be responsible for the effect on bulblets formation and swelling. We used the exclusion method to confirm above results and hypothesis, and observed that only a small part of sucrose was transformed by cell wall invertase and entered the cells through hexose transporters, playing a certain effect on bulbelt growth and development through hexose or hexose signaling systems. Overall, the effect of sucrose on bulblet induction and swelling could be explained by sucrose-specific signaling. Furthermore, this effect has a direct correlation with the sucrose-specific vector.
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Acknowledgements
This work was supported by Breeding Project of Sichuan Province 13th Five-Year Plan Tackle Key Problems, China (No. 2016NYZ0038).
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Yuan Zhu and Suping Gao wrote the manuscript. Lingyun Zhou and Yuan Zhu performed experiments. Xiaofeng Fu and Ting Lei assisted with experiments design. Qibing Chen, Xiao Fang Yu and Yonghong Zhou helped to improve the manuscript. Di Hu and Wenji Li analyzed sequencing data and developed analysis tools. Ju Hu and Wenhui Si assisted with analyse experimental results.
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The authors declare that they do not have any commercial or associative interest that represents a conflict of interest in connection with the work submitted.
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The experiments were performed according to the current laws of China.
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Communicated by Sergio J. Ochatt.
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Gao, S., Zhu, Y., Zhou, L. et al. Sucrose signaling function on the formation and swelling of bulblets of Lilium sargentiae E.H. Wilson. Plant Cell Tiss Organ Cult 135, 143–153 (2018). https://doi.org/10.1007/s11240-018-1451-4
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DOI: https://doi.org/10.1007/s11240-018-1451-4