Microarray analysis of gene expression profiles in ripening pineapple fruits

Area of Science:

• Plant Molecular Biology
• Fruit Ripening Genomics
• Ananas comosus Research

Background:

• Pineapple (Ananas comosus) is a commercially important tropical fruit.
• Molecular events during pineapple fruit ripening are largely unknown.
• Understanding ripening is crucial for developing improved pineapple varieties.

Purpose of the Study:

• To profile gene expression changes during pineapple fruit ripening.
• To identify molecular pathways involved in pineapple fruit development.
• To lay the groundwork for molecular breeding of pineapple.

Main Methods:

• Development of a 9277-element pineapple microarray.
• Gene expression profiling across mature green and mature yellow pineapple stages.
• Bioinformatic analysis including DAVID Functional Annotation Cluster (FAC).
• Validation of microarray data using quantitative real-time PCR (qRT-PCR).

Main Results:

• Identified 271 differentially expressed cDNAs during ripening (≥1.5-fold change).
• 160 genes were up-regulated, and 77 were down-regulated.
• Enriched pathways include redox activity, organic acid metabolism, glycolysis, and vitamin C biosynthesis.

Conclusions:

• This is the first microarray-based gene expression study in pineapple.
• Identified novel genes, processes, and pathways involved in pineapple ripening.
• Significantly advances knowledge of non-climacteric fruit ripening mechanisms.