文献类型： 外文期刊
作者： Liu Li-ying 1 ; Duan Liu-sheng 1 ; Zhang Jia-chang 1 ; Mi Guo-quan 2 ; Zhang Xiao-lan 1 ; Zhang Zhen-xian 1 ; Ren Hua- 1 ;
作者机构： 1.China Agr Univ, Coll Agron & Biotechnol, Beijing 100193, Peoples R China
2.Henan Acad Agr Sci, Inst Hort, Zhengzhou 450002, Peoples R China
关键词： ABA;low-temperature stress;LOS5;transgenic plant;cucumber;salt stress
期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：2.848； 五年影响因子：2.979 ）
ISSN： 2095-3119
年卷期： 2013 年 12 卷 5 期
页码：
收录情况： SCI
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 LOSS 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 T-1 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.
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