Abstract:

【Objective】To clarify the effects of organic acid metabolism and soluble sugar changes on the dormancy of Gladiolus gandavensis corms,and to provide the basis for improving the precision cultivation techniques of cut flowers.【Methods】The germination experiment was carried out using current-year corms of the Gladiolus gandavensis cultivar “Pink Friendship”,which had been stored at 10 ℃ for varying lengths of time. The changes in the organic acid and soluble sugar components and contents in the dormant corm of Gladiolus gandavensis were analyzed by liquid chromatography.【Results】Under low temperature(10 ℃)treatment,the dormancy of Gladiolus gandavensis corms began to release after 20 d,and was completely released after 60 d. The processes of dormancy and dormancy release were associated with isoleucine(Ile),lysine(Lys),proline(Pro),aminobutyric acid(GABA),malic acid(MA),and citric acid(CA).The contents of these organic acids increased at 60 d,with the contents of GABA and CA changing most significantly(P<0.05). The content of soluble sugar in Gladiolus gandavensis corm significantly increased at 40 d(P<0.05),while the content of glucose,maloccharide,and maltose decreased at 60 d. The sugar-acid ratio of dormant corms decreased when dormancy was partially released,increased when dormancy was completely released.【Conclusion】The release of dormancy in Gladiolus gandavensis corms was closely correlated with variations in the contents of organic acid and soluble sugar.

Key words: Gladiolus gandavensis corms, Dormancy release, Organic acid, Soluble sugar