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Acta Agron Sin ›› 2013, Vol. 39 ›› Issue (12): 2177-2182.doi: 10.3724/SP.J.1006.2013.02177

• CROP GENETICS & BREEDING·GERMPLASM RESOURCES·MOLECULAR GENETICS • Previous Articles     Next Articles

Overexpression of a Stress Induced Maize NAC Transcription Factor Gene, ZmSNAC1, Improved Drought and Salt Tolerance in Arabidopsis

LU Min,ZHANG Deng-Feng,SHI Yun-Su,SONG Yan-Chun,LI Yu*,WANG Tian-Yu*   

  1. Institute of Crop Science, Chinese Academy of Agricultural Sciences / National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI), Beijing 100081, China
  • Received:2013-03-27 Revised:2013-06-24 Online:2013-12-12 Published:2013-08-12
  • Contact: 黎裕, E-mail: liyu03@caas.cn; 王天宇, E-mail: wangtianyu@263.net

Abstract:

NAC proteins, which are important regulatory factors, have received much attention for their biological functions in abiotic stress adaptations and tolerances, as well as in the plant metabolic processes under biotic stress and in development. Previously, we isolated a stress-induced NAC gene, designed as ZmSNAC1, from the maize inbred line “CN165” and found that overexpression of ZmSNAC1 led to enhanced tolerance to dehydration at seedling stage. In this study, the functions of ZmSNAC1 were further characterized under drought and salt stresses at reproductive stage. The results indicate that overexpression of ZmSNAC1 inArabidopsis conferred enhanced drought and salt tolerances, showing an improved survival percentage and physiological changes, such as the reduced electrolyte leakage and higher chlorophyll content in transgenic plants. These results indicated that ZmSNAC1 may function as a positive regulator in multiple pathways of signal transduction under abiotic stresses and have potential utilization in transgenic breeding for improving stress tolerance in crops.

Key words: ZmSNAC1, Abiotic stress, Stress tolerance, Maize

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