Boron stimulates fruit formation and reprograms developmental metabolism in sweet cherry

Area of Science:

• Plant Physiology
• Molecular Biology
• Agricultural Science

Background:

• Boron is essential for plant development, but its role in early fruit development is not well understood.
• Understanding boron's impact on fruit set and growth is crucial for crop yield.

Purpose of the Study:

• To investigate the physiological, anatomical, metabolic, and transcriptomic effects of boron on sweet cherry fruit development.
• To identify key genes and metabolic pathways regulated by boron during early fruit growth.

Main Methods:

• Pre-flowering application of boron to sweet cherry trees.
• Analysis of fruit set, mesocarp cell size, and endogenous boron content.
• Metabolomic profiling of sugars, alcohols, organic acids, and amino acids.
• Transcriptomic analysis to identify gene expression changes.

Main Results:

• Boron application increased endogenous boron levels, fruit set, and mesocarp cell enlargement.
• Accumulation of various sugars, alcohols, organic acids, and amino acids was observed.
• Transcriptomic analysis revealed boron-responsive genes involved in photosynthesis, metabolism, and growth, including candidate genes like PavPIP5K9 and transcription factors.

Conclusions:

• Pre-flowering boron supply significantly influences sweet cherry early fruit development.
• Boron regulates key metabolic pathways and gene expression, impacting fruit set and growth.
• This study provides a foundation for understanding boron's molecular mechanisms in fruit development.