Kırmızı Hevhulma (Lythrum salicaria L.) Ekstraktlarının Farklı Sıcaklık ve Konsantrasyonlarının Marul Tohumları Üzerindeki Allelopatik Etkisi

Bu çalışmada, farklı konsantrasyonlar (0, 0,5, 1 ve 5 g/100 ml kök, gövde ve yaprak) ve sıcaklıklarda bekletilerek (24 ve 80 °C) eldeedilen kırmızı hevhulma (Lythrum salicaria L.) ekstraktlarının, marul (Lactuca sativa L.) bitkisinin çimlenme ve fide gelişimi üzerineallelopatik etkileri araştırılmıştır. 24 °C ve 80 °C’de hazırlanan bitki ekstraktları karşılaştırıldığında, 80 oC’de hazırlanan bitkiekstraklarının konsantrasyon artışına paralel olarak marul tohum çimlenme yüzdesini ve fide gelişimini 24 °C’ye göre önemli orandaazalttığı tespit edilmiştir. Saf suda 24 °C’de elde edilen ekstraktlar kendi içinde değerlendirildiğinde ise, 5 g yaprak ekstraktıçimlenmeyi tamamen engellediği halde diğer uygulamalar arasında istatistiksel bir fark bulunmamıştır. Bunun aksine kök, gövde veyaprak ekstraktlarının fide gelişimini azalttığı saptanmıştır. Bitki kök, gövde ve yaprağından hem 24 °C hem de 80 °C’de hazırlananekstrakların büyümeyi engelleyici etkileri yüksekten düşüğe göre sıralandığında, sıra yaprak > kök > gövde olarak tespit edilmiştir.Yaptığımız çalışma sonuçlarına göre allelopatik aktivitenin ekstrakt konsantrasyonları ile kaynaklarına (kök, gövde, yaprak) göredeğiştiği belirlenmiştir.

Allelopathic Effect of Different Temperatures and Concentrations of Purple loosestrife (Lythrum salicaria L.) Extracts on Lettuce Seeds

In this study, allelopathic effects of purple loosestrife (Lythrum salicaria L.) extracts, obtained from different concentrations (0, 0.5, 1 and 5 g / 100 ml root, stem and leaves) and temperatures (24 and 80 ° C), on germination and seedling growth of lettuce were investigated. When the plant extracts prepared at 24 °C and 80 °C were compared each other, it was found that the plant extracts prepared at 80 °C significantly decreased the germination percentage and seedling growth of lettuce than plant extracts prepared at 24 °C. When the extracts obtained in pure water at 24 °C were evaluated, 5 g leaf extract completely inhibited germination but there was no statistical difference among the other treatments. In contrast, root, stem and leaf extracts were found to reduce seedling growth. When the growth inhibitory effects of extracts, prepared at both 24 °C and 80 °C from root, stem and leaf, sorted according to high to low, the order was determined as leaf> root> stem. According to the results of our study, allelopathic activity varied according to extract concentrations and sources (root, stem, leaf).

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