Seed germination of Cistus creticus L. and Cistus laurifolius L. as influenced by dry-heat, soaking in distilled water and gibberellic acid
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CitationTilki, F. (2008). Seed germination of Cistus creticus L. and Cistus laurifolius L. as influenced by dry-heat, soaking in distilled water and gibberellic acid. Journal of environmental biology, 29(2), 193.
The effects of dry-heat and seed soaking in distilled water or in gibberellic acid on germination performance of Cistus creticusL. and C. laurifolius L. were studied in the present study. Germination percentages of two Cistus species were low due to dormancy. Soaking in distilled water for 24hr resulted in 28% germination in C. creticus and 43% in C. laurifolius. Gibberellic acid applications (20, 100 and 250mg l(-1)) for 24hr gave 32, 30 and 23% germination, respectively in Cistus creticus and 33, 37 and 28% germination, respectively in C. laurifolius. Dry-heat pretreatments at 50, 80 and 100 degrees C for several times (1-60 min) also significantly increased germination percentage in two species. The highest germination in C. creticus was obtained with dry-heat at 100 degrees C for 1 or 5 min (80% and 83%, respectively) and in C. laurifolius at 100 degrees C for 5 min (87%). A significant increase in germination rate was also achieved under different pretreatments. The physiological dormancy caused by an impermeable seed coat can be overcome by dry-heat pretreatments in two Cistus species.