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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Mar 2009, 29 (2)                                     Back


Ovarian development in Labeo dyocheilus (McClelland) during active

Seed 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, Artvin Coruh University, Artvin - 08000, Turkey

(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)

 

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