Dormancy and Germination Requirements of Five Species From Brassicaceae

Öz

The germination requirements of fve plant species from Brassicaceae; Thlaspi papillosum Boiss.
& Huet, Thlaspi lilacinum Boiss., Draba brunifolia ssp. olympica Sibth. ex DC., Aubrieta olympica Boiss., Iberis
spruneri Jord., from alpine site on Uludağ Mountain, Turkey, were investigated. The effects of moist chilling (+4 °C)
for 15 and 30 days, and gibberellic acid (GA3; 250, 500 and 1000 ppm), and combined GA3 and moist chilling
treatments were studied under darkness (20°C) and light (20/10 °C; 12/12 h, light/dark). T.papillosum seeds were
found as non dormant, but the other four Brassicaceae seeds were found to have physiological dormancy which
can be broken by moist chilling and GA3 combinations. T. lilacinum and D. bruniifolia seeds, were resulted highest
germination percentage at 1000 ppm GA3 at darkness with 30 days of moist chilling and GA3 combinations. A.
olympica seeds germinated best at 15 days moist chilling and GA3 combinations at darkness. I. spruneri seed
germination increased at 15 days moist chilling and GA3 combinations at both darkness and photoperiod conditions.
Interactions among moist chilling and GA3 were signifcant in I. spruneri and A. olympica seeds, but signifcant
only at darkness in T. lilacinum, and non-signifcant in D. bruniifolia seeds. Thus, prolonged moist chilling of seeds
combined by GA3 under photoperiod conditions required to change the dormant status in these species. Our results
suggest that these fve Brassicaceae species, three of them are endemic, have different germination requirements to
escape unfavorable habitat conditions.

Anahtar Kelimeler

• Acid,brassicaceae,endemic,gibberellic chilling,seed germination

Brassicaceae Familyasından Beş Türde Dormansi ve Çimlenme Gereksinimleri

Öz

Bu çalışmada Uludağ alpin bölgede yetişen Brassicaceae familyasına ait Thlaspi papillosum Boiss. & Huet,
Thlaspi lilacinum Boiss., Draba brunifolia ssp. olympica Sibth. ex DC., Aubrieta olympica Boiss., Iberis spruneri
Jord. türlerinin çimlenme gereksinimleri araştırıldı. Karanlık (20°C) ve fotoperiyot (20/10 °C; 12/12 h, ışık/
karanlık) koşullarında, nemli soğuklama (15 ve 30 gün, +4 °C) ve gibberellik asit (GA3; 250, 500 and 1000 ppm) ile
nemli soğuklama ve GA3 kombinasyonlarının etkileri araştırıldı. T.papillosum tohumlarının dormant olmadığı fakat
diğer dört Brassicaceae türünün tohumlarının nemli soğuklama ve GA3 kombinasyonları ile kırılabilen fzyolojik
dormansiye sahip oldukları tespit edildi. T. lilacinum ve D. bruniifolia türlerinde en yüksek çimlenme başarısı
karanlıkta ve 30 gün nemli soğuklama ile 1000 ppm GA3 kombinasyonlarında bulundu. A. olympica tohumları en
yüksek karanlıkta ve 15 gün gün nemli soğuklama ile GA3 kombinasyonlarında çimlendi. I. spruneri çimlenmesi
karanlık ve fotoperitotta 15 gün gün nemli soğuklama ile GA3 kombinasyonlarında arttı. I. spruneri ve A. olympica
türlerinde nemli soğuklama ve GA3 interaksiyonu anlamlı, T. lilacinum türünde sadece karanlıkta anlamlı ve D.
bruniifolia türünde ise anlamsız bulundu. Sonuç olarak üçü endemik olan beş Brassicaceae türünde dormansinin
kırılması için daha uzun süre nemli soğuklamaya veya GA3kombinasyonlarına gerek duyulduğu, bu farklı çimlenme
davranışlarının türlerin uygun olmayan çevre koşullarından kaçınabilmek için gerekli olduğu belirlenmiştir.

Anahtar Kelimeler

• Brassicaceae,çimlenme,endemik,gibberellik asit

Kaynakça

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