Seed Germination after 30 Years Storage in Permafrost

Area of Science:

• Agriculture
• Botany
• Cryobiology

Background:

• The Nordic Gene Bank initiated a long-term seed storage experiment over 30 years ago in Svalbard's permafrost.
• The experiment aimed to monitor seed viability and storage life under sub-zero conditions.

Purpose of the Study:

• To assess the long-term viability of agricultural and horticultural crop seeds stored under permafrost conditions.
• To identify factors influencing seed longevity in cryopreserved samples.

Main Methods:

• Ultra-drying seeds to 3%-5% moisture content before sealing in glass tubes.
• Conducting germination tests following International Seed Testing Association (ISTA) protocols.
• Monitoring germination rates of 38 crop accessions over a 30-year period.

Main Results:

• Initial median germination was 92%, remaining stable for 20-25 years.
• By 30 years, the median germination dropped to 80%, with increased variation.
• Rye, wheat, and English ryegrass showed significant germination decline, while Kentucky bluegrass and cucumber performed better.
• Higher initial seed moisture levels correlated with lower germination rates.

Conclusions:

• Permafrost seed storage demonstrates variable longevity, with significant declines observed after three decades.
• Pre-storage seed moisture content is a critical factor affecting long-term seed viability.
• Crop-specific responses to cryopreservation highlight the need for tailored storage strategies.