Pollen Viability and Anomalies in European Hazelnut: Cultivar Traits or Environmental Effect?

Area of Science:

• Agricultural Science
• Plant Biology
• Cytometry

Background:

• Optimizing hazelnut productivity requires understanding pollen viability and anomalies.
• Limited data exists on how pollen viability changes across different hazelnut cultivars and environments.

Purpose of the Study:

• To monitor pollen hydration using impedance flow cytometry and determine optimal rehydration times.
• To quantify hazelnut pollen viability over three flowering seasons.
• To assess the impact of genetic, environmental, and agronomic factors on viable and anomalous pollen formation.

Main Methods:

• Impedance flow cytometry was used to analyze pollen hydration and viability.
• Pollen viability was monitored across three flowering seasons in different locations.
• Multifactorial analysis was employed to evaluate genetic and environmental influences.

Main Results:

• Viable pollen recovered to ~85% viability after 4 hours of hydration post-dehydration stress.
• Pollen viability showed cultivar-specific patterns, stable yearly but variable by site.
• Wild-type hazelnut accessions had higher viability and less anomalous pollen (<3%) compared to cultivated genotypes (30-50%).

Conclusions:

• Hazelnut pollen viability is a result of genetic predisposition interacting with local environmental conditions.
• Anomalous pollen formation is primarily linked to stable, genotype-specific traits.
• Cultivar-specific genetics play a dominant role in hazelnut pollen quality, informing breeding and orchard management.