超表达AVP1基因提高甜菜的耐低磷和耐盐抗旱性
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1.内蒙古农业大学农学院;2.内蒙古农牧业科学研究院

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国家自然科学基金(32060507)


Overexpression of AVP1 Gene Improved the Tolerance to Low Phosphorus, Salt and Drought Stress in Sugar Beet
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The National Natural Science Foundation(32060507)

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    摘要:

    为探讨H+-焦磷酸酶编码基因对甜菜磷吸收和抗性的影响,实现优良基因在甜菜基因工程中的利用。本研究以超表达拟南芥液泡膜H+-焦磷酸酶编码基因AVP1转化甜菜,对转基因甜菜耐低磷、耐盐性和抗旱性进行分析。结果显示:AVP1基因能够在甜菜植株的根、叶中表达,且在逆境胁迫下表达量增强;控制磷素供应条件下,转基因甜菜的含磷量显著高于野生型甜菜,转AVP1基因甜菜可以提高对磷的吸收利用效率;干旱、盐胁迫处理条件下,AVP1基因在转基因甜菜中显著上升,在200 mmol·L-1 NaCl处理下或自然干旱7 d后,转基因植株的生长虽然受到抑制,但受抑程度明显低于野生型植株。此外,随着盐和干旱胁迫的加剧,与野生型植株相比,转基因植株体内MDA含量较低而脯氨酸含量显著增加,AVP1基因可减轻逆境对甜菜细胞膜损伤,提高甜菜细胞渗透调节能力,从而增强了甜菜的耐盐性和抗旱性。

    Abstract:

    In order to explore the effect of H+- pyrophosphatase coding gene on phosphorus absorption and resistance of sugar beet, and to realize the utilization of excellent genes in sugar beet genetic engineering. In this study, AVP1 gene encoding vacuolar membrane H+- pyrophosphatase of Arabidopsis thaliana was used to transform sugar beet, and the low phosphorus tolerance, salt tolerance and drought resistance of transgenic sugar beet were analyzed. The results showed that AVP1 gene could be expressed in the roots and leaves of sugar beet plants, and the expression level increased under stress; Under the condition of controlling phosphorus supply, the phosphorus content of transgenic sugar beet was significantly higher than that of wild type; Under drought and salt stress, AVP1 gene increased significantly in transgenic sugar beet. Under 200 mmol · L-1 NaCl treatment or 7 days after natural drought, the growth of transgenic plants was inhibited, but the degree of inhibition was significantly lower than that of wild type plants. In addition, with the aggravation of salt and drought stress, compared with wild type plants, the MDA content of transgenic plants is lower and the proline content is significantly increased. AVP1 gene can reduce the damage of stress to the cell membrane of sugar beet, improve the osmotic adjustment ability of sugar beet cells, thereby enhancing the salt tolerance and drought resistance of sugar beet.

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孙亚卿,张少英,王晓娇,等.超表达AVP1基因提高甜菜的耐低磷和耐盐抗旱性[J].西北植物学报,2023,43(11):1827-1833

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  • 收稿日期:2023-02-07
  • 最后修改日期:2023-08-20
  • 录用日期:2023-09-01
  • 在线发布日期: 2023-11-14
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