In vitro Induction of Axillary Turion Production in Hydrilla Verticillata with the Potential for Short-Term Storage via Alginate Encapsulation
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Abstract
Hydrilla verticillata is an aquatic macrophyte that has attracted increasing attention due to its potential applications in ecological management and pharmaceutical research. To advance these applications, cultivating this plant using efficient large-scale operations under controlled conditions and germplasm storage technology, such as plant tissue culturing, are much more desirable than harvesting it from nature, which also has the potential to cause environmental damage. However, information regarding the tissue culture of this submerged vascular plant remains limited. Therefore, the present study aimed to establish an efficient in vitro stock culture system that could subsequently be utilized to investigate the effects of in vitro culture conditions, as well as the potential for synthetic seed production and short-term storage. In vitro cultivation of H. verticillata was successfully achieved using basal liquid Murashige and Skoog (MS) medium. The addition of either benzyladenine or paclobutrazol to the medium resulted in reduced shoot elongation and decreased lateral branching. Notably, when explants cultured in basal liquid MS basal medium were transferred to semi-solid MS medium, the development of axillary turions was observed in 55% of the jars, compared to 0% in those that remained submerged in the liquid medium, suggesting that water stress, reduced direct availability of nutrients and improved aeration conditions may stimulate axillary turion formation in vitro. Furthermore, these axillary turions were found to be a suitable explant source for synthetic seed production and enhanced plant survival during low-temperature storage compared with synthetic seeds derived from shoot tissues. The findings of this study provide a useful approach for H. verticillata germplasm conservation and facilitate the transportation of plant materials.
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