《植物生理学报》 2015, 51(9): 1440-1446

过表达IbMYB1基因甘薯增强了对土壤干旱胁迫的抗性

陈晓丽^1,2, 李红兵^2,*, 孙振玫³, 李孟洁², 李雨霖², 郭尚洙⁴, 邓西平²

西北农林科技大学¹生命科学学院, ²水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, ³林学院, 陕西杨凌712100; ⁴韩国生命工学研究院植物系统工程研究中心, 大田305-806, 韩国

通信作者：李红兵；E-mail: lhb_7381@nwsuaf.edu.cn；Tel: 029-87012884

摘　要：

以超表达甘薯MYB1基因(IbMYB1)的转基因甘薯(TS)以及未转基因甘薯(NT)为实验材料, 在盆栽条件下对成活苗进行干旱胁迫处理, 研究转基因与未转基因甘薯在干旱胁迫后, 膜脂过氧化及抗氧化系统中主要指标的变化情况。结果表明, 在干旱胁迫条件下, 转基因甘薯花青素含量显著增加, 薯块中花青素含量最高为对照的7倍; 转基因和未转基因甘薯在土壤干旱条件下叶绿素含量降低; 超氧阴离子(O₂·ˉ)和丙二醛(MDA)含量增加, 转基因甘薯的增加幅度低于未转基因甘薯; 转基因甘薯超氧化物歧化酶(SOD)、过氧化氢酶(CAT)和抗坏血酸过氧化物酶(APX)活性都高于未转基因甘薯。这些结果表明超表达IbMYB1基因可以降低甘薯在干旱胁迫条件下受损害的程度。

关键词：转基因甘薯; 干旱胁迫; 抗氧化系统; 花青素

收稿：2015-05-13   修定：2015-08-03

资助：国家重点基础研究发展计划(2015CB150402)、国家自然科学基金(51479189)和西北农林科技大学科技创新专项(Z109021304)。

Overexpression of IbMYB1 Gene Enhanced Tolerance to Soil Drought Stress in Sweet Potato

CHEN Xiao-Li^1,2, LI Hong-Bing^2,*, SUN Zhen-Mei³, LI Meng-Jie², LI Yu-Lin², Kwak Sang-Soo⁴, DENG Xi-Ping²

¹College of Life Sciences, ²State Key Laboratory of Soil Erosion and Dry Land Farming on the Loess Plateau, Institute of Soil and Water Conservation, ³College of Forestry, Northwest A & F University, Yangling, Shaanxi 712100, China; ⁴Plant Systems Engineering Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-806, Korea

Corresponding author: LI Hong-Bing; E-mail: lhb_7381@nwsuaf.edu.cn; Tel: 029-87012884

Abstract:

Transgenic sweet potato (TS) overexpressing IbMYB1 and non-transgenic (NT) were employed as experimental material, and chose survival seedlings in pots with drought stress condition. Response of lipid peroxidation and antioxidative system during drought stress in TS and NT were investigated. The results indicated that anthocyanin contents of TS increased obviously, the biggest anthocynin content in storage roots of TS was seven times to control. Chlorophyll contents in TS and NT plants decreased during drought stress, while, O₂ˉ· and malondialdehyde (MDA) contents in TS and NT were increased, and the increase rate of TS was significantly lower than NT. The activities of SOD, CAT and APX in TS were obviously higher than those in NT plants. It was concluded that overexpression of IbMYB1 gene could reduce damage degree of sweet potato under the condition of drought stress.

Key words: transgenic sweet potato; drought stress; antioxidative system; anthocyanin