Abstract
BackgroundDehydration responsive element-binding (DREB) transcription factors play a crucial role in plant growth, development and stress responses. Although DREB genes have been characterized in many plant species, genome-wide identification of the DREB gene family has not yet been reported in pineapple (Ananas comosus (L.) Merr.).ResultsUsing comprehensive genome-wide screening, we identified 20 AcoDREB genes on 14 chromosomes. These were categorized into five subgroups. AcoDREBs within a group had similar gene structures and domain compositions. Using gene structure analysis, we showed that most AcoDREB genes (75%) lacked introns, and that the promoter regions of all 20 AcoDREB genes had at least one stress response-related cis-element. We identified four genes with high expression levels and six genes with low expression levels in all analyzed tissues. We detected expression changes under abiotic stress for eight selected AcoDREB genes.ConclusionsThis report presents the first genome-wide analysis of the DREB transcription factor family in pineapple. Our results provide preliminary data for future functional analysis of AcoDREB genes in pineapple, and useful information for developing new pineapple varieties with key agronomic traits such as stress tolerance.
Highlights
Abiotic stress, such as salinity, drought, and high or low temperatures, severely affects the growth and development of plants
The 20 AcoDREB genes mapped to 14 pineapple chromosomes (Fig. 1), with three genes on Chr2 and two genes each on Chr3, Chr5, Chr6 and Chr17
Our analysis suggested that overexpression of some AcoDREBs in pineapple could help to develop new pineapple varieties with abiotic stress tolerance
Summary
Abiotic stress, such as salinity, drought, and high or low temperatures, severely affects the growth and development of plants. Identification and expression analysis of the DREB transcription factor family in pineapple (Ananas comosus (L.) Merr.). Transcription factors (TFs) play pivotal roles in abiotic stress responses. They activate or repress the expression of stress-response genes by recognizing and binding to cis-elements in the promoters of their targets (Golldack, Luking & Yang, 2011; Malhotra & Sowdhamini, 2014; Agarwal et al, 2017). They are the main targets of genetic engineering for enhancing stress tolerance in crop plants (Century, Reuber & Ratcliffe, 2008). Our results provide preliminary data for future functional analysis of AcoDREB genes in pineapple, and useful information for developing new pineapple varieties with key agronomic traits such as stress tolerance
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