Journal of Integrative Agriculture ›› 2013, Vol. 12 ›› Issue (5): 825-834.DOI: 10.1016/S2095-3119(13)60270-1

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Arabidopsis LOS5 Gene Enhances Chilling and Salt Stress Tolerance in Cucumber

 LIU Li-ying, DUAN Liu-sheng, ZHANG Jia-chang, MI Guo-quan, ZHANG Xiao-lan, ZHANG Zhen-xian, REN Hua-zhong   

  1. 1.College of Agronomy and Bio-Technology, China Agricultural University, Beijing 100193, P.R.China 
    2.Horticulture Institute, Henan Academy of Agricultural Sciences, Zhengzhou 450002, P.R.China
  • 收稿日期:2012-01-06 出版日期:2013-05-01 发布日期:2013-05-01
  • 通讯作者: Correspondence REN Hua-zhong, Tel: +86-10-62731009, Fax: +86-10-62732825, E-mail: renhuazhong@cau.edu.cn
  • 作者简介:LIU Li-ying, E-mail: liuliying35@126.com
  • 基金资助:

    This work was supported by the National Basic Research Program of China (973 Program, 2009CB11900) and the National Key Research Program of China (2008BADA6B03, 2008BADB1B05 and 2009BADB8B00).

Arabidopsis LOS5 Gene Enhances Chilling and Salt Stress Tolerance in Cucumber

 LIU Li-ying, DUAN Liu-sheng, ZHANG Jia-chang, MI Guo-quan, ZHANG Xiao-lan, ZHANG Zhen-xian, REN Hua-zhong   

  1. 1.College of Agronomy and Bio-Technology, China Agricultural University, Beijing 100193, P.R.China
    2.Horticulture Institute, Henan Academy of Agricultural Sciences, Zhengzhou 450002, P.R.China
  • Received:2012-01-06 Online:2013-05-01 Published:2013-05-01
  • Contact: Correspondence REN Hua-zhong, Tel: +86-10-62731009, Fax: +86-10-62732825, E-mail: renhuazhong@cau.edu.cn
  • About author:LIU Li-ying, E-mail: liuliying35@126.com
  • Supported by:

    This work was supported by the National Basic Research Program of China (973 Program, 2009CB11900) and the National Key Research Program of China (2008BADA6B03, 2008BADB1B05 and 2009BADB8B00).

摘要: Low temperature and high salinity are the major abiotic stresses that restrict cucumber growth and production, breeding materials with multiple abiotic resistance are in greatly need. Here we investigated the effect of introducing the LOS5 gene, a key regulator of ABA biosynthesis in Arabidopsis thaliana, under the stress-responsive RD29A promoter into cucumber (Cucumis sativus L. cv. S516). We found that T1 RD29A-LOS5 transgenic lines have enhanced tolerance to cold and salt stresses. Specifically, transgenic lines exhibited dwarf phenotypes with reduced leaf number, shorter internode, decreased length of the biggest leaf, fewer female flowers, shorter fruit neck and lower vitamin C (Vc). The increased cold tolerance can be reflected from the significantly decreased cold index, the reduced electrolyte leakage index and the MDA content upon cold treatment as compared to those in the control. This may result from the accumulation of internal ABA, soluble sugars and proline, and the enhanced activities of protective enzymes superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) in the transgenic lines. Under salt treatment, the transgenic lines exhibited increased germination index, vigor index, more lateral roots and increased root fresh weight. Moreover, RD29A-LOS5 transgenic plants displayed quicker responses in salt stress than that in low-temperature stress.

关键词: ABA , low-temperature stress , LOS5 , transgenic plant , cucumber , salt stress

Abstract: Low temperature and high salinity are the major abiotic stresses that restrict cucumber growth and production, breeding materials with multiple abiotic resistance are in greatly need. Here we investigated the effect of introducing the LOS5 gene, a key regulator of ABA biosynthesis in Arabidopsis thaliana, under the stress-responsive RD29A promoter into cucumber (Cucumis sativus L. cv. S516). We found that T1 RD29A-LOS5 transgenic lines have enhanced tolerance to cold and salt stresses. Specifically, transgenic lines exhibited dwarf phenotypes with reduced leaf number, shorter internode, decreased length of the biggest leaf, fewer female flowers, shorter fruit neck and lower vitamin C (Vc). The increased cold tolerance can be reflected from the significantly decreased cold index, the reduced electrolyte leakage index and the MDA content upon cold treatment as compared to those in the control. This may result from the accumulation of internal ABA, soluble sugars and proline, and the enhanced activities of protective enzymes superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) in the transgenic lines. Under salt treatment, the transgenic lines exhibited increased germination index, vigor index, more lateral roots and increased root fresh weight. Moreover, RD29A-LOS5 transgenic plants displayed quicker responses in salt stress than that in low-temperature stress.

Key words: ABA , low-temperature stress , LOS5 , transgenic plant , cucumber , salt stress