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黄瓜遗传转化体系优化的研究

DOI: 10.7668/hbnxb.2015.05.019, PP. 115-121

Keywords: 黄瓜,遗传转化,基因型,固化剂,抗氧化剂,有机添加物

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Abstract:

为了提高农杆菌介导的黄瓜遗传转化效率,以亚洲生态型长春密刺、欧洲生态型Poinset76和Marketmore763种黄瓜为材料,筛选了适合遗传转化最佳的基因型,并通过改变培养基固化剂、添加抗氧化剂和有机添加物的方式对遗传转化体系进行优化。结果发现,3种基因型黄瓜中,长春密刺的抗性芽诱导分化表现最佳,而Poinset76和Marketmore76稍差;在脱乙酰吉兰糖胶为固化剂的培养基上,3种基因型的抗性芽诱导率比以琼脂粉为固化剂的培养基诱导率分别高28.21,19.71,15.39个百分点;共培养基中添加50mg/L抗氧化剂α-硫辛酸时,长春密刺抗性芽诱导率最高达66.67%,平均芽分化数最高达1.32;在选择培养基中添加1.5g/L的有机添加物水解酪蛋白,长春密刺抗性芽诱导率和平均芽分化数最高,分别为67.15%和1.42。此外,在前人建立的农杆菌介导的遗传转化体系的基础上,得到了以长春密刺为遗传转化的最适基因型,脱乙酰吉兰糖胶为培养基固化剂,共培养基中添加50mg/Lα-硫辛酸或选择培养基中添加1.5g/L水解酪蛋白的优化遗传转化体系,极显著提高了外植体抗性芽诱导率和平均芽分化数,推动了黄瓜转基因进程。

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