In a nutshell: pistachio genome and kernel development

Area of Science:

• Plant Genomics
• Nutritional Biochemistry
• Sustainable Agriculture

Background:

• Pistachio (Pistacia vera) is a climate-resilient nut crop with high nutritional value.
• Limited genomic and molecular data hinder understanding of pistachio nut development and nutritional traits.
• Advancing pistachio requires a reference genome and detailed developmental studies.

Purpose of the Study:

• To generate a chromosome-scale reference genome for Pistacia vera 'Kerman'.
• To investigate the spatiotemporal molecular processes of pistachio nut development.
• To identify genes and pathways regulating nutritional quality, particularly oil accumulation in kernels.

Main Methods:

• Generated a chromosome-scale reference genome assembly.
• Conducted spatiotemporal transcriptomic analysis across 14 developmental time points (hull, shell, kernel).
• Integrated transcriptomic data with physiological data from three growing seasons.

Main Results:

• Defined four distinct stages of pistachio nut growth and maturation.
• Identified transcriptional and metabolic shifts in kernel development related to nutritional quality.
• Discovered candidate regulatory genes (e.g., PvAP2-WRI1, PvNFYB-LEC1) involved in unsaturated fatty acid accumulation.

Conclusions:

• The generated genome and developmental data provide essential resources for pistachio improvement.
• Key genes regulating oil accumulation offer targets for enhancing pistachio's nutritional value and shelf life.
• This study advances understanding of hard-shelled fruit development and benefits other woody crops.