Murat YILDIRIM, Okan ERKEN, Bayram KIZILKAYA

Su stresi altında yetiştirilen kırmızı lahanada (Brassica oleracea L.var.Rubra) bazı bioaktif bileşiklerin değişimleri

Kırmızı lahana (Brassica oleracea L.var.Rubra) üzerinde iki yıl süreyle yürütülen bu çalışmada farklı sulama seviyelerinin verim, şeker ve organik asit miktarları üzerine etkisi belirlenmeye çalışılmıştır. Bu çalışma killi-tın toprak bünyesi üzerinde damla sulama sistemi kullanılarak yürütülmüştür. Her bir sulama konusu 4 gün aralıklarla A-sınıfı buharlaşma kabına göre sulanmıştır. Normal sulama (I1.0) konusunda A-sınıfı buharlaşma kabından meydana gelen buharlaşmanın tamamı (1.00xEp) uygulanmış, kısıtlı sulama konularında uygulanan sulama suyu miktarları bu uygulamanın farklı fraksiyonları I0.7 (0.7xEp), I0.3 (0.3xEp), I0.0 (0.0xEp) şeklinde gerçekleştirilmiştir. Yapılan uygulamalar sonucunda, kırmızı lahananın olgunlaşma ve veriminde toprak nem düzeyinin sulama ile belli düzeyde tutulmasının önemli olduğu gözlemlenmiş ve aşırı su stresinin yaşandığı I0.3 ve I0.0 konularında bitkinin morfoloji ve veriminde önemli azalmaların olduğu buna bağlı olarak sulama ile verim arasında doğrusal bir ilişki olduğu belirlenmiştir. Bu nedenle suyun kıt bir kaynak olmaması durumunda kırmızı lahananın su ihtiyacının tam karşılanması gerektiği görülmektedir. Ancak, su kısıtının uygulandığı konularda toplam şeker ve asitler içerisinde; askorbik, okzalik, tartarik ve malik asit miktarlarında artış olmuş, ancak laktik asitte azalma olduğu gözlenmiştir, diğer taraftan da farklı su seviyelerinin sitrik asit içeriğinde önemli bir etki yapmadığı bu çalışma sonucunda belirlenmiştir.

Anahtar Kelimeler:

Kırmızı lahana, Brassica, Organik asitler, Su stresi, Abiotik stress

Changes in some bioactive compounds of red cabbage (Brassica oleracea L.var.Rubra) under water stress

A two-year study was performed on red cabbage (Brassica oleracea L.var.Rubra) to assess the effect of different irrigation levels on yield, sugar and organic acid contents. The study was conducted using drip irrigation system on a clay loam soil. The volume of irrigation water applied with 4-day intervals to each treatment was based on Class-A pan evaporation (Ep). In the full irrigation treatment (I1.0), a pan evaporation using screen covered Class-A pan was measured with 4-day intervals and all amount of evaporation was applied in the normal (1.00xEp) treatment, and deficit amounts were imposed on three irrigation treatments as I0.7 (0.7xEp), I0.3 (0.3xEp), and I0.0 (0.0xEp). The plant-available soil water at maturity and yield of red cabbage was significantly related to irrigation amounts. Imposition of deficit irrigation resulted in yield reduction, especially in the severe stress treatments I0.3 and I0.0. Therefore, yields were related linearly to irrigation. That’s why, if there is no water scarcity full water demand of red cabbage need to be compensated for the whole growing season. However, in the deficit treatment, total sugar and especially ascorbic, oxalic, tartaric and malic acid contents increased, and only lactic acid decreased, on the other hand there was no significant effect of different water levels on the content of citric acid.

Keywords:

Red cabbage, Brassica, Organic acids, Water stress, Abiotic stress,

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