Tuz Stresine (NaCl) Karşı Portulaca oleracea L. Türünün Kültür ve Yabani Formlarında Morfofizyolojik Yanıtların Karşılaştırılması

Öz

Toprak tuzluluğu, küresel ölçekte tarımsal üretimi kısıtlayan başlıca çevresel stres etmenlerinden biridir. Bu çalışma, farklı NaCl konsantrasyonlarının (0, 50, 100, 200 ve 300 mM) kültür ve yabani semizotu (Portulaca oleracea L.) formlarında çimlenme ve fide gelişimi üzerindeki etkilerini değerlendirmeyi amaçlamaktadır. Bulgular, artan tuz seviyelerinin her iki formda da çimlenme oranı, kök ve sürgün gelişimi gibi büyüme parametrelerini anlamlı biçimde azalttığını ortaya koymuştur. Özellikle 200 ve 300 mM NaCl uygulamaları bu parametreleri ciddi şekilde baskılamıştır. Bununla birlikte, 50 ve 100 mM konsantrasyonlarında bazı morfolojik parametrelerde sınırlı da olsa artış gözlemlenmiş; bu durum, semizotunun hafif ve orta düzeydeki tuz stresine belirli bir tolerans geliştirebildiğine işaret etmektedir. Klorofil düzeyleri, başlangıçta artış göstermesine rağmen yüksek tuz seviyelerinde (200 ve 300 mM) keskin şekilde azalmış ve klorofil sentezi neredeyse tamamen durmuştur. Karşılaştırmalı analizler, kültür semizotu bireylerinin yabani türe kıyasla daha yüksek tuz toleransı sergilediğini göstermiştir. Bu sonuçlar, kültür semizotunun tuzlu topraklarda yetiştirilebilecek alternatif bir sebze türü olabileceğini ve sürdürülebilir tarım ile tuzlu toprakların rehabilitasyonu gibi uygulamalarda potansiyel taşıdığını göstermektedir.

Anahtar Kelimeler

• Tuz stresi
• semizotu (Portulaca oleracea L.)
• tuz toleransı
• klorofil miktarı

Comparative Assessment of Morphophysiological Responses to Salt Stress (NaCl) in Cultivated and Wild Forms of Portulaca oleracea L.

Öz

Soil salinity is one of the major environmental stress factors limiting agricultural production on a global scale. This study aims to evaluate the effects of different NaCl concentrations (0, 50, 100, 200, and 300 mM) on germination and seedling development in cultivated and wild forms of Portulaca oleracea L. The findings revealed that increasing salt levels significantly reduced growth parameters such as germination rate, root, and shoot development in both forms. In particular, 200 and 300 mM NaCl treatments severely suppressed these parameters. However, at 50 and 100 mM concentrations, limited increases were observed in some morphological traits, indicating a certain level of tolerance of purslane to mild and moderate salt stress. Although chlorophyll levels initially increased, they sharply declined under high salt conditions (200 and 300 mM), with chlorophyll synthesis nearly coming to a halt. Comparative analyses showed that the cultivated purslane individuals exhibited greater salt tolerance than the wild type. These results suggest that cultivated purslane may be a viable alternative vegetable for saline soils and holds potential for applications in sustainable agriculture and the rehabilitation of salt-affected lands

Anahtar Kelimeler

• Salt stress
• Purslane (Portulaca oleracea L.)
• Salt tolerance
• Chlorophyll content

Kaynakça

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