Ayçiçeði (Helianthus annuus L.)'nde giberellik asit dozlarýnýn verim ve abiyotik stres koþullarýnda çimlenme üzerine etkileri | The effects of gibberellic acid doses on yield and germination under abiotic stress conditions in sunflower (Helianthus annuus L.)

anglais. This study was carried out to determinate the effects of different gibberellic acid doses on sunflower yield, yield components in Eskiþehir conditions and to detect the GA3 doses on seed germination under abiotic stress conditions. Field and laboratory experiments were performed in 2013 using Sanbro MR and gibberellic acid as materials in this study. Yield and yield components of sunflower were investigated after gibberellic acid doses of control (distilled water), 50, 100, 200, 300, 400 ppm were pulverized to the plants with growing stage of 6-8 leaves (V6-V8). Salinity and drought stresses were performed by using the same doses of GA3 applied to the seeds both for 8 and 16 h. According to the research results, although plant height and one thousand seed weight enhanced by increasing GA3 doses, blooming time, head diameter, seed yield per plant, oil content, oil yield, chlorophyll content decreased. Increasing GA3 doses shortened two days of blooming time. In laboratory experiment, especially lower doses of GA3 were effective for salt and drought stresses. It was concluded that seed treatment with 50 ppm dose of GA3 for 8 h can be beneficial for decreasing the effect of abiotic stress conditions on germination.

Summaries (En, Tr)

turc. Bu araþtýrma, Eskiþehir koþullarýnda farklý giberellik asit (GA3) dozlarý uygulanan ayçiçeðinde verim ve verim öðeleri ile tohuma uygulanan GA3 dozlarýnýn abiyotik stres koþullarýnda çimlenme üzerine etkilerini belirlemek amacýyla yürütülmüþtür. Çalýþmada materyal olarak Sanbro MR ayçiçeði çeþidi ile GA3 kullanýlmýþtýr. 2013 yýlýnda yürütülen tarla denemelerinde kontrol (saf su), 50, 100, 200, 300 ve 400 ppm GA3dozlarý bitkiler 6-8 yapraklý (V6-V8) olduðu dönemde uygulanarak verim ve verim öðeleri incelenmiþtir. Çimlendirme denemelerinde, ayný dozlarda GA3 ayçiçeði tohumlarýna 8 ve 16 saat süreyle uygulanarak tuz ve kuraklýk stresinde çimlenme performanslarý incelenmiþtir. Araþtýrma sonuçlarýna göre, artan GA3 dozlarý çiçeklenme süresinin 2 gün kýsalmasýný saðlamýþtýr. Bitki boyu ve bin tane aðýrlýðý GA3 dozlarý ile artmasýna raðmen, çiçeklenme süresi, tabla çapý, bitkide tane verimi, yað oraný, yað verimi ve klorofil içeriði azalmýþtýr. Laboratuvar denemelerinde ise özellikle düþük dozlarda uygulanan GA3 dozlarý tuz ve kuraklýk stresinde etkili olmuþtur. Tohuma 8 saat süreyle uygulanacak 50 ppm GA3 dozunun tuz stresinin çimlenme üzerine etkisini azaltmak bakýmýndan yararlý olabileceði sonucuna varýlmýþtýr

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