2008, 21(5): 729-733.
The op timal conditions of seeds germination for different cultivarswas studied. The results showed that thesuitable germination temperature varied with different cultivars. The op timal germination temperature was 20 ℃ forearly flowering cultivars‘Raizan No. 1’, while for medium flowering cultivar‘Rinzan No. 2’and late floweringcultivar‘Raizan No. 3’, the suitable temperature were 18 ℃ and 15 ℃ separately. During the p rocess of seedgermination, lighting time and light constitutes didn’t have significant effect on germination rate. The experimentsshowed that the germination rates of three cultivars decreased greatlywhen germination temperature was over 24 ℃,especially for‘Raizan No. 1’. So, different p re-chilling treatments of‘Raizan No. 1’were taken, in order to solvethis p roblem. The results indicated that germination at 30 ℃ was accelerated by p re-chilling treatment at 10 ℃ formore than 10 days, germination rate wasmore than 75% , and itwas 85. 22% by the same p retreatment for 20 days,the same as op timal germination temperature 20 ℃. Whereas p retreatment at 3 or 5 ℃ had no p romotive effects at 30℃ germination condition, germination rate was less than 40%. In conclusion, p re-chilling treatmet at 10 ℃ formore than 10 dayswas recommended to germination of L ilium ×form olongi under high temperature conditions.