Ekinezya (Echinacea purpurea L.) Bitkisinde Kuraklık Stresi ve Deniz Yosunu Uygulamalarının Bazı Fizyolojik Parametreler Üzerine Etkisi

Bu çalışma, Echinacea purpurea L.’da PEG 6000 ile oluşturulan farklıozmotik basınçta (kontrol,-0.5 MPa, -1.0 MPa ve -1.5 MPa) kuraklıkstresi ile deniz yosunu (Ascophyllum nodosum) uygulamalarının(kontrol, 2, 4 ve 6 cc/l) bazı fizyolojik parametreler üzerindekietkilerini belirlemek amacıyla yapılmıştır. Ekinezya bitkisininyaprak alanı, yaprak klorofil miktarı, yaprak dokularında iyonsızıntısı, malondialdehit düzeyi (MDA), yaprak dokularında bağıl suiçeriği ve yaprak dokularında membran dayanıklılık indeksi gibiparametreler incelenmiştir. Araştırma sonucunda; kuraklık stresininbitkinin yaprak alanı, yaprak dokularında bağıl su içeriği vemembran dayanıklılık indeksini azalttığı, MDA düzeyi ve yaprakdokularında iyon sızıntısı miktarında ise artışlara neden olduğubelirlenmiştir. Kuraklık stresinin yaprak klorofil oranı üzerine iseönemli bir etkisi bulunmamıştır. Deniz yosunu ile kuraklık stresininbitki üzerindeki olumsuz etkileri azaltılmıştır. Deniz yosunuuygulamalarının, MDA düzeyi ve yaprak dokularında iyon sızıntısıhariç incelenen yaprak klorofil oranı ve membran dayanıklılık indeksiüzerindeki etkisi olumlu ve arttırıcı yönde olmuştur. Deniz yosunuuygulamaları, yaprak dokularında bağıl su içeriği ile yaprak alanı gibiparametreleri etkilememiştir.

Effect of Drought Stress and Seaweed Applications on Some Physiological Parameters in Echinacea (Echinacea purpurea L.)

This study was carried out to determine the effects of seaweed (Ascophyllum nodosum) extract applications (control, 2, 4 and 6 cc/l) and drought stress at the different osmotic pressure (control,-0.5 MPa, -1.0 MPa and -1.5 MPa) generated by PEG 6000 on some physiological parameters in Echinacea. The leaf area, leaf chlorophyll content, ion leakage in leaf tissues, malondialdehit level (MDA), relative water content, and membrane endurance index in leaf tissues of echinacea plants were investigated.As a result of the research; leaf area, membrane endurance index and relative water content in leaf tissues decreased under drought stress. It was determined that there was increase in the level of MDA and ion leakage in leaf tissues by the applications. Drought stress did not have any significant effect on the leaf chlorophyll content. It has been determined that seaweed applications had the negative effects on the plant of drought stress. There were positive and increasing effects on the examined parameters such as leaf chlorophyll content and membrane endurance index except for MDA level and ion leakage in leaf tissues of seaweed applications. Seaweed applications did not affect investigated parameters includfing relative water content of leaf tissues and leaf area.

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