Cryopreservation of Jerusalem artichoke cultivars using an improved droplet-vitrification method

文献类型： 外文期刊

第一作者： Zhang, Jin-Mei

作者： Zhang, Jin-Mei;Han, Li;Lu, Xin-Xiong;Xin, Xia;Yin, Guang-Kun;He, Juan-Juan;Chen, Xiao-Ling;Han, Li;Wang, Ling;Volk, Gayle M.

作者机构：

关键词： Droplet-vitrification;Jerusalem artichoke;Shoot tips;Thermal analysis;Ultrastructural characterization

期刊名称：PLANT CELL TISSUE AND ORGAN CULTURE （ 影响因子：2.711； 五年影响因子：2.73 ）

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年卷期：

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收录情况： SCI

摘要： Jerusalem artichoke (Helianthus tuberosus L.) cultivars are conserved in genebanks for use in breeding and horticultural research programs. Jerusalem artichoke collections are particularly vulnerable to environmental and biological threats because they are often maintained in the field. These field collections could be securely conserved in genebanks if improved cryopreservation methods were available. This work used four Jersualem artichoke cultivars ('Shudi', 'M6', 'Stampede', and 'Relikt') to improve upon an existing procedure. Four steps were optimized and the resulting procedure is as follows: preculture excised shoot tips (2-3 mm) in liquid MS medium supplemented with 0.4 M sucrose for 3 days, osmoprotect shoot tips in loading solution for 30 min, dehydrate with plant vitrification solution 2 for 15 min before rapid cooling in liquid nitrogen, store in liquid nitrogen, rapidly rewarm in MS liquid medium containing 1.2 M sucrose, and recover on MS medium supplemented with 0.1 mg L-1 GA(3) for 3-5 days in the dark and then on the same medium for 4-6 weeks in the light (14 h light/10 h dark). After cryopreservation, Jerusalem artichoke cultivar 'Shudi' had the highest survival (93%) and regrowth (83%) percentages. Cultivars 'M6', 'Stampede', and 'Relikt' achieved survival and regrowth percentages ranging from 44 to 72%, and 37-53%, respectively. No genetic changes, as assessed by using simple sequence repeat markers, were detected in plants regenerated after LN exposure in Jerusalem artichoke cultivar 'Shudi'. Differential scanning calorimetry analyses were used to investigate the thermal activities of the tissues during the cryopreservation process and it was determined that loading with 2.0 M sucrose and 0.4 M sucrose dehydrated the shoot tips prior to treatment with PVS2. Histological observations revealed that the optimized droplet vitrification protocol caused minimal cellular damage within the meristem cells of the shoot tips.

分类号： Q942

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