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Characterization and primary functional analysis of a bamboo NAC gene targeted by miR164b

竹藤论文

期刊/会议:

PLANT CELL REPORTS

Language:

English

作者:

Wang Lili; Zhao Hansheng; Chen Dongliang; Li Lichao; Sun Huayu; Lou Yongfeng

Experts:

Gao Zhimin

年份:

2016

卷:

35

期:

6

页码:

1371-1383

关键词:

Bamboo; NAC; miR164b; RLM-5 ' RACE; qRT-PCR; Lateral root; NaCl and drought stresses; F-v/F-m

PeSNAC1 , a stress-related NAC1 from Phyllostachys edulis , was characterized. Ectopic expression in Arabidopsis indicated that PeSNAC1 together with ped -miR164b participated in the regulation of organ boundaries and stress tolerance. NAC (NAM, ATAF1/2 and CUC2) participates in many different processes regulating plant growth, development, and stress response. A total of 125 NAC genes have been predicted in moso bamboo (Phyllostachys edulis), but their roles are poorly understood. PeSNAC1 targeted by ped-miR164b was focused for further study. The cleavage of PeSNAC1 mRNA guided by ped-miR164b was validated using RLM-5′ RACE. Tissue-specific expression analysis demonstrated that ped-miR164b had a declining trend from root, sheath, leaf, to that of stem, which was opposite to that of PeSNAC1. Transgenic Arabidopsis plants overexpressing either PeSNAC1 (OX-PeSNAC1) or, ped-miR164b (OX-ped-miR164b) driven by the CaMV35S promoter were generated. OX-ped-miR164b plants showed similar phenotype of cuc2 mutants whose growth was seriously suppressed. Compared with Col-0, sense OX-PeSNAC1 plants grew rapidly and flowered earlier, whereas antisense plants grew slowly and exhibited delayed flowering. Sense OX-PeSNAC1 plants had the greatest number of lateral roots, while antisense OX-PeSNAC1 and OX-ped-miR164b plants had fewer lateral roots than Col-0. Under NaCl and PEG6000 stresses, survival rates were higher and F (v)/F (m) values declined more slowly in sense OX-PeSNAC1 plants than in Col-0, with lower survival rates and a more rapid decrease in F (v)/F (m) values conversely observed in antisense OX-PeSNAC1 and OX-ped-miR164b plants. These findings indicated that ped-miR164b-targeted PeSNAC1 may play key roles in plant development and tolerance to salinity and drought stresses.