Onion seed viability during storage and drying declines with genotype specificity. Changes in antioxidant enzymes at different viability levels were investigated in seeds of the three onion cultivars Akg-12, Valencia and TEG-502. For this purpose, 95, 80, 60, 40 and 20% viability levels were obtained by the use of controlled deterioration treatments in seeds of each onion cultivar. Subsequently, catalase (CAT), peroxidase (POX) and superoxide dismutase (SOD) activity measurements were conducted at these viability levels. POX activity was below detection limit in aged onion seeds. The activities of CAT and SOD decreased due to seed ageing in each cultivar. The decreases observed in CAT and SOD activities were more evident when seed viability decreased below 60% level. Moreover, a high level of correlation was found between loss of seed viability and the decreases occur in CAT and SOD activities, in seeds of each onion cultivar.

Lavender is an important perfume, cosmetic and pharmaceutical plant worldwide because of its high quality and quantity essential oil content. Besides, it is an important ornamental plant with pleasant fragrance and beautiful vegetative pattern in bush form. In seed propagation, there are some problems such as low germination times and germination rate. The aim of this study was to investigate the effects of some selected osmotic conditioners on lavender seeds. Osmotic conditioning (OC) was performed in seeds with methyl jasmonate (MeJA) (1.0 mM) and seaweed ( Ascophyllum nodosum ) extract (1:500 seaweed extract) at 20°C for 1 and 2 days. After the treatment, seeds were characterized for germination tests at 25°C. Germination indexes of the seeds, germination rates and mean germination time were determined. Seaweed treatment for 1 and 2 day applications and MeJA treatment for 2 days significantly increased the germination rates in lavender seeds compared to the control. In addition seaweed 2 day treatment and MeJA 2 day treatment also increased the germination index. In conclusion, this study indicated that both MeJA and seaweed treatments had positive effects on germination parameters studied in lavender seeds.

Bu çalışma ile çerezlik kabak tohumlarının bölgemizdeki çimlenme oranları, tohumların nem kapsamları ve tohumların protein, şeker ve yağ içerikleri araştırılmıştır. Bölgenin ekolojik koşulları göz önüne alındığında özellikle çerezlik kabak tohumlarını ekim zamanı düşük toprak ve hava sıcaklığı nedeniyle çimlenme ve çıkış kayıpları olmaktadır. Bu tezin amacı Kayseri ilinin Develi ve Tomarza ilçelerinden toplanıp S5 ve S6 kademesine kadar kendilenmiş 15 adet hat da 12 ve 15°C’de çimlenme; çimlenmenin, tohumun yağ, protein düzeyleriyle ilişkisini araştırmak amacıyla yapılmıştır. Kabak tohumlarının 12 ve 15°C’deki çimlenme oranları, ortalama çimlenme süresi ve indeksi hesaplanmış, 15 °C’de %86 - 100, 12°C’de ise çimlenme performansları ise %55 - 100 oranındadır. Tohumlarının protein içeriği %18.76 - 29.48 yağ içeriği ise %30.85 - 45.93 değerleri arasında değişmiştir. Çimlenme testleri sonuçlarına bakılınca tohumların protein, yağ içeriklerinin tohum gücü üzerinde önemli bir etkisinin olduğu tespit edilmiştir. Sonuç olarak incelenen parametrelerden iki farklı sıcaklık altında çalışılan hatlar arasında farklılıklar olduğu tespit edilmiştir. Bu durum ıslahçılar tarafından göz önünde bulundurulmalıdır.

In this study, the effects of black and white colored water pillows on the yield and water use efficiency of 'Marathon' cucumber variety were investigated and compared with the drip irrigation (DI) method. Thise study examined yield per decare and per plant, number of fruits per plant and per square meter, and seasonal water consumption values. In terms of the evaluated parameters, water pillows provided statistically higher values compared to drip irrigation, except for the seasonal water consumption, where they provided lower values. Yield per hectare for white and black water pillows were found to be 124.67 and 126.53 tons, respectively, while the drip irrigation yield was 78.24 tons. Seasonal plant water consumptions were 419 mm for water pillows and 622 mm for drip irrigation. These results indicate that the water pillow irrigation method is more effective in terms of yield and water use efficiency than drip irrigation in greenhouse cucumber cultivation.

In this study, effects of blue and black polyethylene mulches used together with drip irrigation on yield of Yagmur cucumber cultivar were investigated under greenhouse conditions and mulching treatments were compared with unmulched drip irrigation treatments. Experiments were conducted in a polycarbonate greenhouse in Kayseri province of Turkey in 2019. Throughout the growing season, 655 mm irrigation water was applied in drip+mulch treatments and 776 mm in unmulched drip irrigation treatments. Although 16% less water was applied in drip+mulch treatments, 37% more yield was obtained from drip+blue mulch treatments and 34% more from drip+black mulch treatments. The highest cucumber yields per decare (12296.7 and 11783.6 kg) were respectively obtained from drip+blue mulch and drip+black mulch treatments and the lowest (7771 kg) from unmulched drip irrigation treatments. The highest weed dry biomass (88.42 g m-2) was obtained from unmulched drip irrigation treatments. While the effects of mulching treatments on weed biomass were found to be significant as compared to unmulched treatments, blue and black mulches were not significantly different.