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Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (6): 1644-1660.doi: 10.16420/j.issn.0513-353x.2024-0368

• Cultivation?Physiology & Biochemistry • Previous Articles     Next Articles

Study on Influencing Factor of Bulblet Enlargement in vitro of Asiatic Lily

WU Xiaodan1, KONG Xiangfeng1, GAO Li2, GONG Tiangeng1, PIAO Meiling1, YU Pengcheng1, and JIA Guixia1,*()   

  1. 1 Beijing Key Laboratory of Ornamental Plants Germplasm Innovation & Molecular Breeding,National Engineering Research Center for Floriculture,Beijing Laboratory of Urban and Rural Ecological Environment,Beijing Laboratory of Urban and Rural Ecological Environment,Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants of Ministry of Education,School of Landscape Architecture,Beijing Forestry University,Beijing 100083,China
    2 Beijing Green Garden Group Co,Ltd. Beijing 100067,China
  • Received:2024-09-01 Revised:2025-02-22 Online:2025-06-20 Published:2025-06-20
  • Contact: and JIA Guixia

Abstract:

This study used tissue cultured bulblets of the new Asian lily cultivars‘Tianxin’and ‘Xiaohaixing’as materials to investigate the effects of 6-BA,NAA,and glyphosate on inducing adventitious buds on the scales. Based on the screening of suitable induction media for adventitious buds,the effects of plant growth regulators such as salicylic acid(SA),paclobutrazol(PP333),and 2, 4-dichlorobrassinolide(2,4-EBR),sucrose,activated carbon(AC),NAA,6-BA,and basic media on the swelling of small bulbs were studied,and the expression changes of starch synthase genes SSSSSS2,sugar efflux transporters genes SWEET14 and SWEET15 during the swelling development of small bulbs were analyzed. The results showed that‘Tianxin’and‘Xiaohaixing’germinated the most on MS + 0.5 mg · L-1 6-BA + 0.2 mg · L-1 NAA + 30 g · L-1 sucrose medium,with differentiation coefficients of 2.78 and 2.03,respectively. The enlargement coefficients of‘Tianxin’in MS + 1.0 mg · L-1 PP333 + 0.05 mg · L-1 2,4-EBR + 60 g · L-1 sucrose,and MS + 0.5 mg · L-1 6-BA + 0.1 mg · L-1NAA + 60 g · L-1 sucrose + 1.0 g · L-1 activated carbon medium were 4.42,5.15,and 4.16,respectively. The suitable swelling medium for them was selected as MS + 1.0 mg · L-1 NAA + 0.1-0.5 mg · L-1 6-BA + 60-90 g · L-1 sucrose + 1.0-2.0 g · L-1 AC. The enlargement coefficients of‘Tianxin’and‘Xiaohaixing’in B5 medium were significantly higher than those in MS and WPM medium treatments,at 4.57 and 4.83,respectively. In B5 medium,the expression levels of soluble starch synthase genes SSS and SSS2,as well as sugar efflux transporters SWEET14 and SWEET15,gradually increase with the growth of the‘Tianxin’bulblet,reaching their highest levels during the rapid expansion phase of bulblet. In the leaves,the expression levels are highest at 36 days before entering the rapid expansion phase of bulblet.

Key words: Lilium, bulblet enlargement, tissue culture, carbohydrate metabolism