Yapraktan Uygulanan Melatonin ve L-Triptofan, Tuz Stresi Altındaki Marulun Büyüme Parametrelerini Nasıl Etkiler?

Bu çalışmanın amacı, dışsal Melatonin (100, 300 ve 500 µM) ve L-trytophan (125, 250, 375 ppm) uygulamalarının, tuz stresi altında yetiştirilen marul bitkilerinin bazı büyüme parametreleri üzerine etkilerini incelemektir. Çalışma ilkbahar sezonunda yarı kontrollü sera koşullarında yürütülmüştür. Bitkilere dışsal uygulamalar yapraktan spreyleme şeklinde iki kez yapılmıştır. Tuz stresi ise sulama suyuna ilave edilen NaCl (0 mM, 100 mM, 200 mM) ile oluşturulmuştur. Çalışma tesadüf parselleri deneme desenine göre üç tekerrürlü olarak yürütülmüştür. Çalışma sonunda, 200 mM tuz stresi koşulunda yetiştirilen bitkilerde yaprak sayısı, tuz nekrozu, yaprak yaş ağırlığı, kök yaş ağırlığı ve toplam yaprak yüzey alanı parametreleri üzerine en yüksek dozdaki dışsal uygulamaların, en yüksek etkiye sahip oldukları anlaşılmıştır. Bu değerler üzerine dışsal uygulamaların etkisi karşılaştırıldığında, melatonin etkisinin daha belirgin olduğu anlaşılmıştır. Yaprak genişliği, yaprak uzunluğu ve yaprak yüzey sıcaklığı değerlerine dışsal uygulamaların herhangi bir etkisi olmamıştır. Bu değerler sadece tuz konsantrasyonuna bağlı olarak değişmiştir. Çalışma sonucunda, 500 µM melatonin uygulamasının marul bitkisinde tuz toleransını önemli ölçüde artırdığı sonucuna varılmıştır. Ancak daha genel bir yargıya varmak için doz aralıklarının ve genotip/çeşit sayısının artırılması gerektiği anlaşılmıştır.

How Do Foliar Application of Melatonin and L-Tryptophan Affect Lettuce Growth Parameters Under Salt Stress?

The aim of this study was to investigate the effects of exogenous Melatonin (100, 300 and 500 µM)and L-tryptophan (125, 250, 375 ppm) applications on some growth parameters of lettuce plantsgrown under salt stress. The study was carried out under semi-controlled greenhouse conditions inspring (March/April) season. The exogenous applications to lettuce plants were carried out two timesas foliar spraying. Salt stress was generated by adding NaCl (0 mM, 100 mM, 200 mM) to irrigationwater. The complete randomized design was used with three replications in this experiment. At theend of the study, it was found that the highest doses of exogenous applications had the highest effecton the parameters of the number of leaves, salinity necrosis, fresh leaf weight, fresh root weight, andtotal surface area of lettuce plants under 200 mM salinity condition. When the effects of the subtracton these values were compared, the effect of melatonin was found to be more pronounced. Leafwidth, leaf length, and leaf surface temperature values were not affected by the external application.These values only changed depending on salt concentration. As a result of the study, it was concludedthat the application of 500 µM melatonin significantly increased salt tolerance in lettuce plants.However, in order to reach a more general conclusion, the dose ranges and genotype/variety numbersshould be increased.

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