Makedonya meşesi (Quercus trojana P.B. Webb.) fidanlarında kuraklık stresinin su potansiyeli ve gaz değişim parametreleri üzerindeki etkisi

Küresel iklim değişikliğine bağlı olarak yaz kuraklıklarının süre uzunluğunun ve şiddetinin artması ormanları olumsuz etkileyecek olup, artan kuraklık nedeniyle ağaçların maruz kaldığı kuraklık stresinin tür bazında incelenmesi, türün verdiği tepkinin anlaşılması oldukça önemlidir. Bu çalışmada Quercus trojana P.B. Webb. fidanlarında kuraklık stresinin fizyolojik (gün ortası su potansiyeli, relatif su içeriği, gaz değişim parametreleri) ve biyokimyasal (toplam çözünebilir şeker içeriği) özellikler üzerindeki etkisi araştırılmıştır. Sera koşullarında 1+0 yaşlı fidanlara kontrol (haftada 2-3 kez sulama) ve kuraklık stresi (30 gün susuz bırakma) olmak üzere iki işlem uygulanmıştır. Kuraklık stresi ardışık iki kez tekrar edilmiştir. İki aylık stres döngüsü sonunda kuraklık stresi, gün ortası su potansiyelini, relatif su içeriğini, net fotosentez hızını, stoma iletkenliğini ve terleme oranını düşürürken, su kullanım etkinliğini ve toplam çözünebilir şeker içeriğini arttırmıştır. Çalışmada gün ortası su potansiyeli, net fotosentez hızı, stoma iletkenliği, terleme oranı ve toplam çözünebilir şeker içeriği arasında güçlü ilişkiler tespit edilmiştir.

Anahtar Kelimeler:

Su stresi, Quercus trojana, Gün ortası su potansiyeli, Fotosentez, Çözünebilir şeker

Impact of drought stress on water potential and gas exchange parameters in Macedonian oak (Quercus trojana P.B. Webb.) seedlings

The increase in the duration and severity of summer droughts due to global climate change will adversely affect forests, and it is very important to examine the drought stress that trees are exposed to as a species due to increasing drought and to understand the response of the species. In this study, the effects of drought stress on physiological (midday water potential, relative water content, gas exchange parameters) and biochemical (total soluble sugar content) characteristics were investigated in Quercus trojana P.B. Webb. seedlings. Under greenhouse conditions, two treatments were applied to 1+0 old seedlings: control (2-3 times a week for watering) and drought stress (no watering for 30 days). Drought stress was repeated twice, consecutively. At the end of the two-month stress cycle, drought stress decreased the midday water potential, relative water content, net photosynthesis rate, stomatal conductance and transpiration rate, while increasing the water use efficiency and total soluble sugar content. In the study, strong relationships were found between midday water potential, net photosynthesis rate, stomatal conductance, transpiration rate and total soluble sugar content.

Keywords:

Water stress, Quercus trojana, Midday water potential, Photosynthesis, Soluble sugar,

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