Abstract
Lilium fargesii Franch is a slow-growing species endemic to China with small-sized bulbs; however, the factors affecting bulblet enlargement remain unclear. Here, we show that 60 g·L− 1 sucrose and darkness are optimal conditions to increase the weight and expansion of bulblets. Both the weight gain and expansion rates of bulblets were further promoted by exogenous indole-3-butyric acid (IBA), the gibberellin (GA) inhibitor paclobutrazol (PBZ), and the jasmonic acid (JA) inhibitor diethyldithiocarbamic acid (DIECA), and were inhibited by exogenous benzylaminopurine (6-BAP) and methyl jasmonate (MeJA) under a 16-h light/8-h dark photoperiod. Exogenous application of GA3, 6-BAP, and MeJA, but not IBA, increased internal hormone contents; the inhibitors kynurenine (Kyn), PBZ, and DIECA decreased internal hormone levels, whereas the cytokinin inhibitor lovastatin had no effect. The weight gain and expansion rates of bulblets were promoted by high internal IBA and 6-BAP contents and low internal MeJA content. The roots number of bulblets was promoted by decreased IBA and increased GA3, and was inhibited by increased IBA and deceased 6-BAP. Endogenous GA3 or 6-BAP levels influenced the proliferation and total weight of daughter bulblets but not the formation of new leaves. Bulblets enlargement was positively associated with the proliferation and total weight of daughter bulblets and negatively associated with internal MeJA content. The number of new leaves was significantly negatively correlated with the weight gain, expansion, and roots of bulblets. These findings provide valuable insights for the in vitro preservation of L. fargesii to facilitate the protection and utilization of wild germplasm resources.
Key message
Variations in carbon source, photoperiod, hormone content affect bulblet development in L. fargesii Franch.
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Data availability
The data generated and analyzed during the current study are available from the corresponding author upon reasonable request. Data sharing does not apply to this article as no datasets were generated or analyzed during the current study.
Abbreviations
- 6-BAP:
-
Benzylaminopurine
- DIECA:
-
Diethyldithiocarbamic acid
- ER:
-
Expansion rate
- GA:
-
Gibberellin
- IBA:
-
Indole-3-butyric acid
- Kyn:
-
Kynurenine
- MeJA:
-
Methyl jasmonate
- NAA:
-
1-Naphthalene acetic acid
- NOL:
-
Number of leaves
- NOR:
-
Number of roots
- PBZ:
-
Paclobutrazol
- PODB:
-
Proliferation rate of daughter bulbs
- TWODB:
-
Total weight of daughter bulblets
- WGR:
-
Weight gain rate
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Acknowledgements
We would like to sincerely thank Prof. Cui Guangfen, Flower Research Institute, Yunnan Academy of Agricultural Sciences, for helping cultivate plantlets of Lilium fargesii Franch. We would like to also thank Prof. Wang Baomin, College of Agriculture, China Agricultural University, for providing the platform for internal hormone determination.
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The research and demonstration on artificial domestication, breeding and cultivation technology for the national key protected wild flowers, the Public Welfare Industry (Agriculture) Research project, Ministry of Agriculture, No. 201203071, 2012–2016.
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All authors participated in the design, data collection, and statistical analysis. After the general framework was conceived by Prof. Dr. Liu Qinglin and Dr. He Junna, Miss Zhou wrote the manuscript, Liu Qinglin and He Junna revised and edited the manuscript, and all the authors read and finalized the manuscript.
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Zhou, L., He, J. & Liu, Q. Effects of hormones, carbon sources, and photoperiod on bulblet development in Lilium fargesii Franch during in vitro culture. Plant Cell Tiss Organ Cult 157, 30 (2024). https://doi.org/10.1007/s11240-024-02755-z
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DOI: https://doi.org/10.1007/s11240-024-02755-z