Embryo Rescue Protocol for Interspecific Hybridization in Squash.

Area of Science:

• Plant Science
• Agricultural Science
• Genetics

Background:

• Interspecific hybridization in Cucurbita (squash) is crucial for enhancing genetic diversity and introducing beneficial traits.
• Established embryo rescue techniques are vital for regenerating plants from wide crosses, but specific protocols for squash are lacking.

Purpose of the Study:

• To develop and describe a reliable embryo rescue protocol for interspecific hybridization in Cucurbita species, specifically between C. pepo and C. moschata.
• To facilitate routine application of embryo rescue in squash breeding programs.

Main Methods:

• Performed 24 interspecific crosses between C. pepo and C. moschata.
• Identified successful cross combinations yielding immature embryos.
• Utilized basal plant growth media for embryo rescue and regeneration.

Main Results:

• Achieved 92% fruit set across 22 of 24 crosses, though many fruits were parthenocarpic with empty seeds.
• Successfully identified one cross combination capable of producing viable immature embryos.
• Rescued 10 interspecific F1 embryos with an 80% success rate using the developed protocol.

Conclusions:

• The described embryo rescue protocol is effective for interspecific hybridization in Cucurbita.
• This methodology will be a valuable tool for squash breeding programs aiming to broaden genetic variation.