H. Yıldız DAŞGAN, Sibel KOÇ, Bulut EKİCİ, HAKAN AKTAŞ, Kazım ABAK

Bazı fasulye ve börülce genotiplerinin tuz stresine tepkileri

Bu çalışmada, 10 fasulye ve 3 börülce genotipinin genç bitki aşamasında tuzluluğa karşı göstermiş oldukları tepkiler ''iyon dengesi (regülasyonu)" yönünden incelenmiş ve genotiplerin tuzluluğa karşı tepkileri bakımından sınıflandırması yapılmıştır. Bitkiler, "derin akan su kültürü" tekniği ile yetiştirilmiştir. Su kültürü ortamında 125 mM NaCl uygulamasının, uygulanmayan kontrol grubu ile iyon alımı açısından karşılaştırılması amacıyla bitkilerin yeşil aksam dokularında Na, K ve Ca konsantrasyonları incelenmiştir. Tuzlu koşullarda yetiştirilen bitkilerde, tuz zararı 1 ile 5 arasında değişen bir skala ile değerlendirilmiştir. Ayrıca, iyonların birbirleriyle olan ilişkileri korelasyon analizleriyle incelenmiştir. Araştırma sonucunda fasulye ve börülce genotiplerinin 125 mM NaCI uygulamasında farklı savunma mekanizmaları ile farklı duyarlılık seviyeleri gösterdikleri belirlenmiştir.

Anahtar Kelimeler:

büyüme ortamı, iyon dengesi, potasyum, sodyum, fasulye, Phaseolus, kalsiyum, börülce, genotip

Responses ofsome bean and cow pea genotypes to salt stress

In this study, 10 bean and 3 cow pea genotypes at early growth stage were investigated for their "ion regulation" under salinity stress. The genotypes were classified for their salinity responses as susceptible or resistant. Plants were grown in "deep re-circulating water culture" system. Bean and cow pea plants were exposed to 125 mM salt (NaCl). Plant shoots with and without salt treatments compared for ion concentrations. Ion analysis of Na, K and Ca of shoot were carried out in order to investigate "ion regulation of the genotypes". A 1 to 5 scale visual evaluation was performed under salt stress plants. The correlations of shoot ion concentrations with each others had also been investigated. It was concluded that, bean and cow pea genotypes showed different responses to 125 mM NaCI, and different susceptibility levels of the genotypes were determineted.

Keywords:

growing media, ion balance, potassium, sodium, bean, Phaseolus, calcium, cowpeas, genotypes,

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