Glisin Betain Uygulamalarının Tuz Stresi Altında Domatesin Bazı Büyüme ve Fizyolojik Özellikleri Üzerine Etkisi

Çalışmada, farklı dozlarda (0, 5, 10 ve 20 mM) yapraktan glisin betainin (GB) uygulamasının tuz stresi altında yetiştirilen domateslerde bitki büyümesi, klorofil içeriği, stoma iletkenliği, fenolik ve prolin içeriği üzerindeki etkileri değerlendirilmiştir. Bu amaçla, domates bitkileri (Lycopersicon esculentum Mill.), 2 ay boyunca 75 mM NaCl ile tuzluluk stresine maruz bırakılmıştır. Tuz stresinin, büyüme parametrelerinde, klorofil içeriğinde ve stoma iletkenliğinde belirgin bir düşüşe yol açtığı tespit edilmiştir. GB uygulaması, domates bitkisinin büyümesi üzerine tuz stresinin engelleyici etkisini azaltarak, stoma iletkenliğinin ve klorofil içeriğinin artmasına neden olmuştur. Tuz stresine karşı toleransı artırmada en etkili GB dozunun 10 mM olduğu belirlenmiştir. Bitki boyu 5, 10 ve 20 mM GB uygulamalarında kontrol grubuna göre sırasıyla % 2.2, % 13.1 ve % 18.9 oranında artmıştır. 5 ve 10 mM GB uygulamaları, klorofil değerlerini (sırasıyla 51.18 ve 53.44) kontrole kıyasla önemli derecede artırmıştır (48.92). 10 mM GB, stoma iletkenliğinde kontrol ile karşılaştırıldığında % 11.3 oranında bir artış göstermiştir. Ayrıca, 10 mM GB, prolin içeriğini kontrole kıyasla % 53.4 artırdığı saptanmıştır. Çalışmamızın sonuçlarına göre, GB uygulamasının, tuzluluk koşullarında büyümeyi arttırmak için domates üretiminde faydalı bir uygulama olabileceği sonucuna varılmıştır.

Anahtar Kelimeler:

Glisin betain, Bitki toleransı, Tuz stresi, Domates

Effects of Exegenous Glycine Betaine Treatments on Growth and Some Physiological Characteristics of Tomato under Salt Stress Condition

The effects of the exogenous foliar application of glycine betaine (GB) with different doses (0, 5, 10 and 20 mM) on plant growth, chlorophyll content, stomatal conductance, phenolic and proline contents in tomato grown under salt stress were evaluated. Tomato plants (Lycopersicon esculentum Mill.) were imposed to salinity stress for 2 months with 75 mM NaCl. Salt stress reduced the growth, chlorophyll reading values and stomatal conductance in tomato. GB application decreased the inhibation of salt stress on tomato plant growth, and increased stomatal conductivity and chlorophyll content. The effective dose of GB was 10 mM to increase tolerance against salt stress. Plant height significantly increased in 5, 10 and 20 mM GB treatments by 2.2, 13.1 and 18.9%, respectively compared to the control. 5 and 10 mM GB treatments significantly increased chlorophyll reading values (51.18 and 53.44, respectively) compared with control (48.92). 10 mM GB exhibited a rapid increase in stomatal conductivity by 11.3% compared with control. Moreover, 10 mM GB showed an increase in proline content by 53.4% compared with control. According to results of our study, it can be suggested that exogenous GB treatments could mitigate the deleterious effects of salt stress in tomato.

Keywords:

Glycine betaine, Plant tolerance, Salt stress, Tomato,

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