No abstract

In agricultural production, one of the limiting factors on plant growth and yield is soil salinity. The plant growth regulators are of considerable importance in alleviating the negative effect of salt stress. The study was carried out to determine the effects of salicylic (SA) and gibberellic acid (GA3) on the growth and some physiological characters in canola (Brassica napus L.) under salinity conditions in greenhouse. For this purpose, a factorial experiment set up as completely randomized design was conducted with three levels of SA (0, 0.5 and 1 mM) and GA3 (0, 50 and 100 mg l-1) and four levels of NaCl (0, 50, 100 and 150 mM) with three replications. In the study, leaf area, plant height, electrolyte leakage, chlorophyll content and the loss of leaf turgor were investigated. Salt treatments reduced significantly all of the considered parameters, compared with the control. Salinity caused a significant reduction of 63 and 67%in plant height and leaf area, respectively, as compared to the control plants. On the contrary, electrolyte leakage was markedly increased (six-fold) with increasing NaCl levels. Gibberellic acid increased significantly plant height and reduced the loss of leaf turgor, without a significant improve in other parameters. The results indicated that application of SA and GA3 to salinity stressed plants did not significantly affect canola vegetative growth. However, GA3 caused a partial decrease in the adverse effect of salinity.

Pre-storage applications are of considerable importance in reducing chemical and physiological changes occurring in potato tubers during prolonged storage. The objective of this study is to determine the effect of increasing doses of pre-storage applied calcium on physical and chemical properties of potato tubers. The experiment was carried out in a completely randomized design with three replications at cold storage with +4 °C temperature and 85-90% moisture. The potato tubers were soaked in three calcium solutions (5%, 10% and 15%) for one hour, along with the control (pure water). The calcium pretreatments showed significant ameliorative effects on all physical and chemical attributes of four months stored potato tubers. With calcium application, sprouting tuber rate and shooting length decreased by 15% and 42% as compared to the control, respectively. The prestorage applications of calcium significantly reduced the losses occurring in total phenolic content and antioxidant activity during storage. In conclusion, the present study suggested that pre-storage calcium applications could reduce storage losses in potato tubers.

Objective:The main objectives of this study are determineted essential oil yield and compositions of lemon verbena, cultivated for the first time, in Black Sea Reagion. Materials and Methods:The plant material is obtanied from Atatürk Hortıcultural Central Research Instıtute, Yalova and cultivated in Ordu. The essential oil components are determined GC-MS system.Results: Fourteen compounds were identified, representing 85.2% of the total essential oil. The 59.9 % of total essential oil components are consist of geranial, limonene, neral and 1,8-cineol. Conclusion:Lemon verbena is suitable and sustainable for agriculture due to the ecological conditions Eastern Black Sea region.

Amaç: Bu çalışmanın amacı; kitosan uygulamasının patateste kuru madde oranı, C vitamin içeriği, toplam suda çözünür kuru madde oranı, toplam fenolik madde içeriği ve toplam antioksidan içeriği gibi bazı kimyasal özellikler üzerindeki etkisinin belirlenmesidir. Materyal ve Yöntem: Soğuk hava deposunda gerçekleştirilen bu araştırmada, depolama öncesi patates yumrularına 4 doz (kontrol, %0.5, %1 ve %2) kitosan, püskürtme yöntemiyle uygulanmıştır. Bulgular: Kitosan uygulamaları arasında %1 kitosan dozu, depolama sırasında kuru madde oranı artışını (%50) ve C vitamini içeriğinin azalışını (yaklaşık %40) önleme açısından en etkili olan doz olarak belirlenmiştir. Toplam fenolik bileşiklerin depolama sonunda kontrole göre %20 artması kitosan uygulamaları ile önlenmiştir. Sonuçlar: Sonuçlar, kitosan uygulamasının, depolama sırasında patateslerde meydana gelen bazı kimyasal değişiklikleri azaltabileceğini göstermektedir.