Molecular Characterization and Transcription Profiling of NAC Genes in Lilium pumilum under Abiotic Stresses

Le résumé fourni par la source

The NAC transcription factors family is one of the plant specific families, which plays a key role in plant biological processes, including the responses to environmental stimuli.However, there are few studies on the NAC gene in Lilium pumilum.In the present study, a total of 21 NAC genes were used to encode the NAC protein.Most NACs contained a complete NAC DNAbinding domain.The RT-PCR indicated that the LpNAC genes were expressed in roots, bulbs and leaves of L. pumilum under salt, drought, low temperature, and abscisic acid (ABA) treatment.The results indicated an important role of NAC in abiotic stress tolerance and ABA-dependent stress signal transduction pathway.Under various abiotic stresses, the LpNAC9 and LpNAC17 were highly expressed in roots.The expression of LpNAC5, LpNAC10, LpNAC19 and LpNAC20 in bulbs increased more than twice as much as that in control group.Similarly, the LpNAC2, LpNAC8, LpNAC17 and LpNAC20 in leaves were up-regulated by all stress.In conclusion, the resistance of L. pumilum to stress environment maybe partly related to the expression of NAC gene.This is first studies to report the NAC gene family of L. pumilum.It clarifies the functions of NACs when plants are subjected to abiotic stress and provides a basis for selecting suitable genes to improve plant stress resistance by molecular techniques.

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