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Journal of Environmental BiologypISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP |
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Abstract - Issue Mar 2009, 29 (2) BackSeed germination of Cistus creticus L.
and Cistus laurifolius L.
as influenced by dry-heat, soaking in distilled
water and gibberellic acid Fahrettin Tilki* Faculty of Forestry, (Received: December 22, 2006
; Revised received: March 05, 2007 ; Re-revised received: May 08, 2007 ;
Accepted: June 22, 2007) Abstract: The effects of
dry-heat and seed soaking in distilled water or in gibberellic
acid on germination performance of Cistus creticus L. 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 24 hr resulted in 28% germination in C. creticus
and 43% in C. laurifolius. Gibberellic acid
applications (20, 100 and 250 mg l-1) for 24 hr 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 șC 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 șC for 1 or 5 min (80% and 83%, respectively) and in C. laurifolius at 100 șC 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. Key words: Cistus, Pretreatment, Seed dormancy, Seed scarification PDF of full length paper is available with
author (fahrettintilki@yahoo.com) Copyright
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