Kuraklık Stresi Altındaki İki Akçaağaç Türünün (Acer negundo ve Acer pseudoplatanus) Fidanlarının Gaz Değişim Parametrelerinin Karşılaştırılması

Öz

Öz − Bu çalışmada, iki yaşında çıplak köklü Acer negundo ve Acer pseudoplatanus fidanlarının büyüme dönemi sonundaki yaprak gaz alışveriş parametrelerini incelenmek için sera içinde (kontrol vs. kuraklık stresi altında) ve dışında açık alan koşulları altında yetiştirilmiştir. Morfolojik özellikler yanında, net fotosentez (Anet), terleme oranı (E), stoma iletkenliği (gs), hücreler arası CO2’in ortamdaki CO2’ye oranı (Ci/Ca), anlık bitki su kullanım etkinliği (WUE=Anet/E) ve içsel (gerçek) su kullanım etkinliği (iWUE=Anet/gs) ölçülmüştür. Sonuç olarak A. pseudoplatanus fidanları A. negundo’ya göre daha fazla boy büyümesi yapmıştır. A. negundo’nun A. pseudoplatanus’tan daha yüksek Anet ve daha düşük iWUE ve Ci/Ca’ya sahip olduğu tespit edilmiştir. Kontrol uygulaması altında yetişen fidanlar, diğer uygulamalara göre daha yüksek Anet, gs, E ve daha düşük iWUE, WUE ve Ci/Ca değerlerine sahip olduğu tespit edilmiştir. Sonuç olarak, gaz değişim parametreleri açısından iki akçaağaç türü arasında önemli bir fark bulunmamıştır. Ancak, A. negundo ve A. pseudoplanus’un kuraklığa dayanıklı bir ağaç türü olduğu söylenebilir.

Anahtar Kelimeler

• Acer negundo
• Acer pseudoplatanus
• stoma iletkenliği
• net fotosentez
• su kullanım verimliliği

Comparison of the Gas Exchange Parameters of Two Maple Species (Acer negundo and Acer pseudoplatanus) Seedlings under Drought Stress

Abstract

In this study, two-year-old bare-root Acer negundo and Acer pseudoplatanus seedlings were grown indoors (control vs. drought-stressed) and outside the hoop house to examine leaf gas exchange parameters in the late growing period. Besides morphological features, several gas exchange parameters, such as net photosynthetic rate (Anet), transpiration rate (E), stomatal conductance (gs), intercellular CO2 to ambient CO2 (Ci/Ca), water use efficiency (WUE=Anet/E), intrinsic water use efficiency (iWUE=Anet/gs) were measured. As a result, A. pseudoplatanus seedlings had a higher stem height growth. A. negundo had a higher Anet, and a lower iWUE and Ci/Ca than A. pseudoplatanus. Seedlings grown under control treatment had a higher Anet, gs, E, and a lower iWUE, WUE, and Ci/Ca values than other treatments. In conclusion, there was no significant difference between the two Acer species in terms of gas exchange parameters. However, it can be said that A. negundo and A. pseudoplatanus are drought resistant.

Keywords

• water use efficiency.
• Acer negundo
• Acer pseudoplatanus
• stomatal conductance
• net photosynthetic rate
• water use efficiency

Kaynakça

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