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园艺学报 ›› 2006, Vol. 33 ›› Issue (3): 501-506.

• 研究论文 • 上一篇    下一篇

香蕉茎尖的玻璃化法超低温保存及其植株再生

吴黎明1, 2;曾继吾1;彭抒昂2;易干军1*;周碧容1;吴元立1   

  1. (1广东省农业科学院果树研究所, 广东广州510640; 2华中农业大学园艺林学学院, 湖北武汉430070)
  • 收稿日期:2005-06-11 修回日期:2005-10-02 出版日期:2006-06-25 发布日期:2006-06-25

Cryopreservation of in Vitro Shoot Tips of Banana by Vitrification and Its Regeneration

Wu Liming1, 2;Zeng Jiwu1; Peng Shu'ang2;Yi Ganjun1*;Zhou Birong1;Wu Yuanli1   

  1. (1 Fruit Research Institute, Guangdong Academy of Agricultural Science, Guangdong, Guangzhou 510640, China; 2College of Horticulture, Huazhong Agricultural University, Wuhan, Hubei 430070, China)
  • Received:2005-06-11 Revised:2005-10-02 Online:2006-06-25 Published:2006-06-25

摘要: 以香蕉(Musa spp. ) 为试材, 对其离体培养茎尖玻璃化法超低温保存影响因素进行研究。结果表明, 不定芽在MS + 3.0~5.0 mg/L 6-BA + 0.1 mg/L NAA的培养基上分化较好。香蕉茎尖超低温保存较佳体系是: 2.0~3.0 cm的茎尖在含0.4 mol/L蔗糖培养基上预培养2 d, 剥取带1~2个叶原基的茎尖(长1.0~1.5 mm) , 室温(25℃) 下装载液(MS + 2 mol/L甘油+ 0.4 mol/L蔗糖) 装载20~30 min, 然后用玻璃化溶液( PVS2 ) 于0℃下处理40 min, 换1次PVS2后迅速投入液氮。保存至少1 h后, 在40℃水浴中化冻90 s, 用1.2 mol/L蔗糖培养液洗涤2次, 每次10 min, 然后转入含0.3 mol /L蔗糖的MS培养基上,暗培养10~15 h后转移到含0.5 mg/L 62BA的MS培养基中, 暗培养1周后转移到正常光下, 3个香蕉品种(巴西蕉、广东香蕉2 号、广东粉蕉1 号) 的成活率分别为75.9%、40.0%和69.6% , 再生率分别为63.4%、35.0%和63.4%。再生植株生长和分化正常, 生根后可移栽成活。

关键词: 香蕉, 茎尖, 超低温保存, 玻璃化法

Abstract: Shoot tips excised from healthy in vitro plants of three Banana cultivars were successfully cryopreserved with the vitrification technique. A suitable procedure was established as follows: 3 - 4 weeks after subculture, shoot tip s about 2 - 3 cm in length were precultured for 2 days onMS medium supplemented with
0.4 mol/L sucrose. Dissected shoot apices about 1.0 - 1.5 mm in length with one or two leaf primordium were loaded with a mixture of 2 mol/L glycerol plus 0.4 mol/L sucrose for 20 - 30 min at room temperature. These excised shoot tips were sufficiently dehydrated in a highly concentrated plant vitrification solution for 40 min at 0℃. And then plunged directly into liquid nitrogen and conserved for at least 1 h. After rapid thawing in water at 40℃ for 90 s, the tips were rinsed with 1.2 mol/L sucrose solution for 20 min at room temperature and then plated on MS medium supplemented with 0.5 mg/L 6-BA. The cryopreserved materials were cultured in darkness for one week so that they could grow quickly. Successfully cryopreserved shoot tips resumed growth
within 10 days of plating and developed shootswithin 1 month without intermediary callus formation. This simple protocol was successfully applied to the three cultivars belonging to two genomic group s of banana. The
survival rate of shoot tips was 75.9% , 40.0% , 69.6% , and regrowth rate reached 63.4% , 35.0% , 63.4% respectively. Almost all the shoot tips formed roots and were successfully transferred to soil in pots. The plantlets could normally root and survive after transplantation.

Key words: Banana, Shoot-tip, Cryopreservation, Vitrification