High-Quality Queens Produce High-Quality Offspring Queens

Area of Science:

• Apiculture and Animal Breeding
• Molecular Biology
• Genetics

Background:

• Honey bee colonies exhibit a preference for rearing new queens from queen cells over worker cells, a behavior potentially shaped by evolutionary pressures.
• The precise molecular and physiological mechanisms underlying this queen rearing preference remain largely unelucidated.

Purpose of the Study:

• To investigate the impact of different egg and larval sources (queen cells vs. worker cells) on the physiological and genetic profiles of first-generation (F1) reared queens.
• To evaluate the quality and gene expression patterns of second-generation (F2) queens reared from F1 queens, assessing the transgenerational effects of queen rearing source.
• To identify key genes involved in development, reproduction, and immune detoxification that are influenced by queen rearing strategies.

Main Methods:

• Queens (F1 generation) were reared using eggs from queen cells (F1-QE), eggs from worker cells (F1-WE), and two-day-old larvae from worker cells (F1-2L).
• Physiological indexes and the expression of development-related genes (Hexamerin, Transferrin, Vitellogenin) were analyzed in F1 queens.
• Second-generation (F2) queens were reared from F1 queens, and their weight, ovariole count, and expression of development, reproduction, and immune detoxification genes were assessed.

Main Results:

• F1-QE queens exhibited superior physiological indexes and higher expression of Hexamerin (Hex) 110 and Transferrin (Trf) genes compared to F1-WE and F1-2L groups.
• No significant differences in Hex70b and Vitellogenin (Vg) gene expression were observed among the F1 groups.
• F2 queens derived from F1-QE mothers demonstrated the highest quality, indicated by enhanced development, reproduction, and immune-detoxification gene expression.

Conclusions:

• The quality of offspring queens is directly influenced by the quality of the mother queen, with queens reared from queen cells producing higher-quality progeny.
• Rearing queens from established queen cells is a critical factor in producing high-quality queens essential for robust honey bee colony growth and survival.
• Understanding these genetic and physiological pathways can inform improved queen rearing practices in apiculture.