This technology covers the seeds, plants, and breeding method for 'Ojeong5,' a new lettuce variety developed by selecting and stabilizing mutants from the ROCHPEA head lettuce line after radiation exposure. Deposited under KCTC19244P, this variety features improved heading, heat tolerance, and yield compared to the original.
While the domestic salad market is growing rapidly, most lettuce is grown from imported seeds. Domestically developed salad lettuce varieties are scarce and lack competitiveness, leading farmers to avoid them. Furthermore, recurring summer heatwaves, heavy rains, and typhoons cause significant crop damage, leading to supply instability, price spikes, and limited salad availability. There is an urgent need for heat-tolerant varieties.
This technology involves cultivating radiation-exposed M1 seeds to obtain M2 seeds from high-value individuals, selecting those with superior phenotypes and heading characteristics, and ensuring genetic stability through repeated cultivation to finalize 'Ojeong5.' This variety features dark black seed coats, an anthocyanin content of 3–6 units/mg, and increased expression of anthocyanin biosynthesis genes such as PAL, CHS, DFR, and ANS. It produces large, dark green heads with an average fresh weight of 600–730g and can be identified via 180–220bp bands using SSR primer PCR. Applicable to summer highland and lowland cultivation, contract farming for fresh-cut salads, and domestic seed distribution, it helps maintain yields during heatwaves, reducing reliance on imports and mitigating summer price volatility.
This invention was developed with support from the Ministry of Science and ICT for the development of bolting-resistant lettuce through genetic analysis of the reproductive growth transition phase.
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