New Prospects for Improving Microspore Embryogenesis Induction in Highly Recalcitrant Winter Wheat Lines

Area of Science:

• Plant biotechnology
• Crop science
• Molecular biology

Background:

• Double haploid (DH) technology via microspore embryogenesis (ME) offers efficient breeding but faces challenges in species like winter wheat.
• Stress during ME induction, including low temperatures and in vitro culture, generates reactive oxygen species (ROS), reducing microspore viability.
• Optimizing ME efficiency requires understanding and mitigating stress responses in microspores.

Purpose of the Study:

• To investigate how controlled plant growth and specific tiller pre-treatments improve microspore stress tolerance and ME induction.
• To elucidate the underlying mechanisms of stress response by analyzing antioxidant and nutrient levels.
• To enhance the commercial viability of ME in winter wheat.

Main Methods:

• Controlled plant growth and specific tiller pre-treatments involving low temperature, mannitol, and sodium selenate.
• Analysis of hydrogen peroxide, glutathione, ascorbate, and macro/micronutrients (Mg, Ca, Na, K, Mn, Zn, Fe, Cu, Mo).
• Cytological examination of microspore suspensions to assess vitality and ME response.

Main Results:

• Modified pre-treatment reduced oxidative stress and improved microspore vitality and ME induction effectiveness.
• Higher microspore vitality correlated with enhanced ROS scavenging capacity and efficient nutrient management.
• Specific pre-treatment protocols demonstrated improved stress resistance in winter wheat microspores.

Conclusions:

• Controlled tiller pre-treatment is a viable strategy to enhance ME efficiency in winter wheat.
• Mitigating oxidative stress through improved nutrient management and ROS scavenging is key to successful ME.
• This research provides a foundation for optimizing DH technology in recalcitrant species.