SPECIES-SPECIFIC SEED VIGOR TEST OF AGING CHIVE FOR RESTORATION AND REGIONAL ADAPTATION UNDER CLIMATE CHANGE

This study aimed to develop a vigor test method that can be applied in the seed storage and ecological restoration of Aging chive (A ilium senescens L). The impact weight of each temperature on germination was described with a sine curve equation. The closer the temperature was to 18.9 degrees C, the faster the germination was, and temperatures below 8.0 degrees C and above 29.7 degrees C negated the temperature accumulation effect. A verification and validation test confirmed the 'impact weight on germination' to be reasonable because it exhibited a hump-shaped relationship with the time to reach 85% germination among the temperature treatments. Furthermore, the time to reach 25, 50 and 75% germination and the change in germination with time did not differ between the actual and predicted values. The hourly accumulated value of 'impact weight on germination' was taken as the temperature score (TS), and the temperature requirement for vigorous germination was 294TS. The temperature requirement was applied to hourly temperature data from Geumsan, Korea, from 1999-2018, and the average date of vigorous seed germination was May 3. Increasing temperature elevation advanced the predicted germination date. Based on the earliest predicted date, germination will advance rapidly. If the temperature is elevated by 2.5 degrees C, the germination date will advance markedly to November 23.