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Electronic Journal of Biotechnology
Universidad Católica de Valparaíso
ISSN: 0717-3458
Vol. 17, No. 6, 2014, pp. 304-310
Bioline Code: ej14048
Full paper language: English
Document type: Research Article
Document available free of charge

Electronic Journal of Biotechnology, Vol. 17, No. 6, 2014, pp. 304-310

 en Isolation and characterization of drought-responsive genes from peanut roots by suppression subtractive hybridization
Ding, Hong; Zhang, Zhi Meng; Qin, Fei Fei; Dai, Liang Xiang; Li, Chun Juan; Ci, Dun Wei & Song, Wen Wu

Abstract

Background: Peanut ( Arachis hypogaea check for this species in other resources L.) is an important economic and oilseed crop. Long-term rainless conditions and seasonal droughts can limit peanut yields and were conducive to preharvest aflatoxin contamination. To elucidate the molecular mechanisms by which peanut responds and adapts to water limited conditions, we isolated and characterized several drought-induced genes from peanut roots using a suppression subtractive hybridization (SSH) technique.
Results: RNA was extracted frompeanut roots subjected to a water stress treatment (45% field capacity) and from control plants (75% field capacity), and used to generate an SSH cDNA library. A total of 111 non-redundant sequences were obtained, with 80 unique transcripts showing homology to known genes and 31 clones with no similarity to either hypothetical or known proteins. GO and KEGG analyses of these differentially expressed ESTs indicated that drought-related responses in peanut could mainly be attributed to genes involved in cellular structure and metabolism. In addition, we examined the expression patterns of seven differentially expressed candidate genes using real-time reverse transcription-PCR (qRT-PCR) and confirmed that all were up-regulated in roots in response to drought stress, but to differing extents.
Conclusions: We successfully constructed an SSH cDNA library in peanut roots and identified several drought-related genes. Our results serve as a foundation for future studies into the elucidation of the drought stress response mechanisms of peanut.

Keywords
Drought-related genes; Drought stress; GO and KEGG analyses; Real-time reverse transcription-PCR

 
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