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Öğe Combined drought and heat stresses trigger different sets of miRNAs in contrasting potato cultivars(Springer Heidelberg, 2021) Gokce, Zahide Neslihan Ozturk; Aksoy, Emre; Bakhsh, Allah; Demirel, Ufuk; Caliskan, Sevgi; Caliskan, Mehmet EminMicroRNAs are small, non-coding RNAs that are responsible for regulation of gene expression during plant growth and development. Although there are many studies on miRNAs in other plants, little work has been done to understand the role of miRNAs in abiotic stress tolerance in potatoes. This study investigates changes in miRNA profiles of two different potato cultivars (tolerant, Unica and susceptible, Russet Burbank) in response to heat, drought and their combination. Transcriptomic studies revealed that miRNA profiles depend on the susceptibility and tolerance of the cultivar and also the stress conditions. Large number of miRNAs were expressed in Unica, whereas Russet Burbank indicated lesser number of changes in miRNA expression. Physiological and transcriptional results clearly supported that Unica cultivar is tolerant to combined drought and heat stress compared to Russet Burbank. Moreover, psRNATarget analysis predicted that major miRNAs identified were targeting genes playing important roles in response to drought and heat stress and their important roles in genetic and post-transcriptional regulation, root development, auxin responses and embryogenesis were also observed. This study focused on eight miRNAs (Novel_8, Novel_9, Novel_105, miR156d-3p, miR160a-5p, miR162a-3p, miR172b-3p and miR398a-5p) and their putative targets where results indicate that they may play a vital role at different post-transcriptional levels against drought and heat stresses. We suggest that miRNA overexpression in plants can lead to increased tolerance against abiotic stresses; furthermore, there should be more emphasis on the studies to investigate the role of miRNAs in combined abiotic stress in plants.Öğe Combined Use of Green Manure and Farmyard Manure Allows Better Nutrition of Organic Lettuce(UNIV AGR SCI & VETERINARY MED CLUJ-NAPOCA, 2014) Caliskan, Sevgi; Yetisir, Halit; Karanlik, SemaOrganic crop production has become a major business due to rising consumer demand, price premiums and increasing market opportunities. A field experiment was conducted to compare organic and conventional production systems by evaluating growth, yield and mineral content of lettuce leaves. Six organic productions systems, green manure (GM), farmyard manure (FYM), commercial organic fertilizer (COP) and their combinations were compared with conventional production system (CPS). A non-fertilized control treatment was also included. Plant growth and yield were found higher in the organic production system compare to conventional production system. The lowest plant growth and yield were obtained in the control treatment. Values of vitamin C content of lettuce grown in the organic production systems were higher than those of the conventional production system. The highest lettuce yield (71.8 and 76.5 t ha(-1)) was obtained with GM + FYM treatment. The results indicated that combined use of green manure and farmyard manure can be successfully used in organic lettuce production.Öğe Comparison of Aeroponics and Conventional Potato Mini Tuber Production Systems at Different Plant Densities(Springer, 2021) Caliskan, Mehmet Emin; Yavuz, Caner; Yagiz, Ayten Kubra; Demirel, Ufuk; Caliskan, SevgiMini tubers are the starting materials of a disease-free seed potato production scheme. Low multiplication rates as well as non-homogenous tuber size distribution are considered the main constraints of a conventional mini tuber production system. In recent years, an aeroponics production system has been developed to overcome the aforementioned problems. It has previously been observed that this system allows multiple harvests with an average yield of 20-50 mini tubers per plant. Several factors, such as cultivar, planting density, nutrient composition of the mist solution, spraying interval and duration and lighting also affect both tuber number and tuber size. However, less attention has been paid to the association of these factors with the aeroponics system. This paper highlights the importance of planting density effect on conventional and aeroponics system. The mini tuber production performances of three potato cultivars (Hermes, Marabel and Sante) were compared at four different planting densities (25, 50, 100 and 200 plants/m(2)) under both conventional and aeroponics systems in two production cycles. The number of tubers per plant increased with decreasing planting density, being highest at 25 plants/m(2)and lowest at 200 plants/m(2)for both cycles. Mean tuber number in the aeroponic system was 19.85 tubers per plant at 25 plants/m(2)and 13.20 tubers per plant at 200 plants/m(2). As the number of tubers per plant decreased, so did their size. As planting density increased, tuber yield per plant both in aeroponics and conventional system decreased, but in general, tuber yield per plant was higher in aeroponics than in the conventional system. In the 1st cycle, the number of tubers per m(2)for Hermes, Sante and Marabel was 290, 364 and 334, respectively, in the conventional system and 787, 1021 and 1168, respectively, in the aeroponics system. Similar numbers were recorded in the 2nd cycle. The average tuber weight was higher in the conventional than in the aeroponics system. Tuber yield/m(2)in this study varied from 5.9 to 9.3 kg/m(2)in the aeroponics system, about twice as high as in the conventional system.Öğe Comparison of organic and traditional production systems in chickpea (Cicer arietinum L.)(2013) Caliskan, Sevgi; Erdogan, Cahit; Arslan, Mehmet; Caliskan, Mehmet EminYield and yield components, and protein content of chickpea (Cicer arietinum L.) were compared in traditional and organic production systems since organic farming has many advantages on environment, animal and human health over traditional production systems. In the study, organic production system, green manure, farmyard manure and effective microorganisms and their combinations were tested as six treatments. Seed yield and some yield components were found higher in the traditional production system than those of organic production systems. The highest protein content was obtained in green manure and farmyard manure applications. Among the organic production systems, green manure and farmyard manure applications could be strongly recommended for organic chickpea producer since the highest seed yields with 2729 in 2007 and 3838 kg ha -1 in 2008 were found in green manure + farmyard manure treatment among the organic production systems.Öğe EFFECT OF GIBBERELLIC ACID ON GROWTH, TUBER YIELD AND QUALITY IN POTATOES (Solanum tuberosum L.)(Soc Field Crop Sci, 2021) Caliskan, Sevgi; Hashemi, Mohammad Samim; Akkamis, Mustafa; Aytekin, Ramazan Ilhan; Bedir, MehmetThe purpose of this study was to determine the effects of different doses of gibberellic acid (GA(3)) on growth, tuber yield and some tuber quality traits of potato. The experiment was arranged in a split-plot design with three replicates, cultivars Marabel, Alegria and Agria were arranged in the main plots, and GA(3) doses (0, 25, 50 and 100 mg GA(3) L-1) in the sub-plots. Gibberellic acid was applied to leaves by spraying on the 50th day after planting (during flowering). The effects of GA(3) applications on tuber yield of potato cultivars were varied. GA(3) applications resulted in significant decrease on chlorophyll content (SPAD), tuber dry matter and chips quality of potato. But it caused significant increase on number of tubers and tuber yield plant(-1). In 2019 and 2020 years, the highest tuber yield was obtained from Alegria cultivar (62.78 and 50.55 t ha(-1) respectively). Total tuber yield values increased from 52.08 t/ha to 65.14 t ha(-1) in 2019 and from 42.12 t ha(-1) to 53.94 t ha(-1) in 2020 with increasing to 100 mg GA(3) L-1 from 0 mgL(-1). Overall, increasing doses of GA(3) resulted in a reduction in tuber dry matter and starch ratio. The GA(3) applications caused deformations in tuber shape, the deformations increased with increasing GA(3) doses.Öğe Effects of Different Irrigation Levels and Nitrogen Fertilization on Some Physiological Indicators of Potato(Springer, 2024) Akkamis, Mustafa; Caliskan, SevgiWater and nitrogen are widely used agricultural inputs in potato production areas. However, the excessive and inappropriate use of these significant inputs may lead to the rapid depletion of water resources and inappropriate nitrogen leakage. In potato production, insight into the effects of water and nitrogen on the physiological properties will help to overcome these difficulties. This study was therefore conducted to determine the effects of different nitrogen and irrigation levels on the physiological (photosynthesis rate, leaf area index, leaf chlorophyll content, and leaf temperature) characteristics of potato. Field experiments were conducted during the 2021-2022 and 2022-2023 primary potato cropping seasons to select the suitable combination of irrigation and fertilization levels for potato production in the Nigde Province of the Central Anatolia Region of Turkey. Employing a factorial design, the study encompassed six nitrogen fertilization rates and three irrigation levels. Measurements were systematically recorded at five distinct intervals (40, 50, 60, 70, and 80 days) post-emergence. The outcomes underscored that nitrogen treatments augmented physiological traits, manifesting in heightened photosynthetic rates, chlorophyll content, and leaf area indices, barring leaf temperature, in comparison to the control group (devoid of nitrogen treatments). Full irrigation (I1) yielded the utmost values for both photosynthesis and leaf area index, with I1N3 (full irrigation and intermediate nitrogen supply) was identified as the most efficacious treatment for these parameters. This study identifies the most appropriate nitrogen and irrigation application for optimum physiological yield of the potato for crop producers. However, it is important to note that the study focused solely on one commercial potato cultivar (Agria), and further research on various potato cultivars is recommended for more conclusive results.Öğe Effects of Elevated Temperature on Agronomic, Morphological, Physiological and Biochemical Characteristics of Potato Genotypes: 1. Agronomic and Morphological traits(Springer, 2024) Naawe, Eric Kuopuobe; Koeken, Ibrahim; Aytekin, Ramazan Ilhan; Gleku, Olivet Delasi; Caliskan, Sevgi; Caliskan, Mehmet EminGlobal elevated temperatures create uncertainties in crop yield production and sustainability, threatening potatoes' food security and sustainability roles. This has been among the primary research concerns necessitating the need to evaluate potato genotypes' response to elevated temperature under field conditions. This study assessed potato genotypes' agronomic and morphological responses to elevated temperatures. The experiments were conducted under field conditions in the 2022 and 2023 cropping seasons in a split-plot design. Two heat treatments were applied; a control treatment in which the plants received the field temperature of the experimental station, and a heat treatment in which the plants received a temperature of + 6.0-10.0 degrees C depending on the date and time of day. The agronomic and morphological traits evaluated included tuber yield, mean tuber weight, days to emergence, plant height, number of stems per plant, days to physiological maturity, and tuber size distribution. The results showed significant (P < 0.01) variations in the potato genotypes in response to elevated temperature in all traits except days to emergence. Elevated temperature promoted plant height by 36.94%, and days to physiological maturity by 2.55%, while reducing the number of stems per plant by 11.77% and days to emergence by 2.31%. Furthermore, elevated temperature increased total tuber yield by 25.38%, the number of tubers per plant by 18.75%, mean tuber weight by 8.89%, third-class tuber size distribution by 25.95% and malformed tuber ratio by 1.98%, while decreasing first-class tuber size distribution by 10.11%, second-class size distribution by 1.70% and marketable tuber yield by 4.22%. The results of this study demonstrated the impact of heat stress on potato tuber yield and size distribution. The study showed that temperatures around 27.0 degrees C to 33.0 degrees C effectively promoted total tuber yield, number of tubers per plant and mean tuber weight; thus, an increase in temperature within the effective range of potato plants promoted yield and yield-related components. This study demonstrates that open-sided field chambers can be a screening tool for heat tolerance of potato genotypes under field conditions. Potato genotypes with less variation in the traits between the heat and control treatment demonstrate heat tolerance and could be used as selection markers for heat-tolerant genotypes.Öğe Irrigation and potassium fertilization effects on plant growth, tuber yield, quality, and water use efficiency of potato(Springer, 2024) Aytekin, Ramazan Ilhan; Caliskan, SevgiPotato (Solanum tuberosum L.) requires high levels of water and potassium to achieve optimal yield and quality. This is of importance for the sustainable agriculture, and therefore, it is quite concern of agronomists to define the proper irrigation level and potassium rates in potato. In this study, we tested three irrigation levels (full irrigation (I100), 66% full irrigation (I66; 33% deficit), 33% full irrigation (I33; 66% deficit)), and six potassium doses (K0:0 kg ha-1 of K, K1:40 kg ha-1 of K, K2:80 kg ha-1 of K, K3:120 kg ha-1 of K, K4:160 kg ha-1 of K and K5:200 kg ha-1 of K) in Agria. The study was conducted in Nigde (Central Anatolia, Turkiye, 37 degrees 56 ' 31.8 '' N 34 degrees 38 ' 04.2 '' E) as a two-year field experiment. In the experiment, the respective values were recorded for each variable; plant height 36.0-92.0 cm, maturation period 82.0-98.0 days, number of stem per plant 3.4-4.7, number of tuber per plant 4.1-7.7, tuber yield per plant 247.1-846.2 g, marketable tuber ratio 79.4-99.4%, discarded tuber ratio 0.6-5.7%, secondary structured tuber ratio 0.0-16.6%, total tuber yield 11.8-38.7 t, dry matter 19.2-21.6%, specific gravity 1.072-1.087 g cm3, and starch 13.2-15.9%. Besides, it was determined that the optimum irrigation x potassium interaction was achieved at I100xK3 and I100xK4 in terms of plant and yield parameters, and I33xK3 and I33 x K4 in terms of tuber quality parameters. In our work, we concluded that a water need of average 590-720 mm (not including the effective rainfall amount) and potassium supply of 120-160 kg ha-1 in Central Anatolia will be optimal for the potato cultivation. The findings of this study will contribute to potato cultivation practices by providing proper information about the optimal irrigation need and potassium dose.Öğe Overview on domestication, breeding, genetic gain and improvement of tuber quality traits of potato using fast forwarding technique (GWAS): A review(Wiley, 2021) Naeem, Muhammad; Demirel, Ufuk; Yousaf, Muhammad Farhan; Caliskan, Sevgi; Caliskan, Mehmet EminTuber quality is the subject of great interest among the processing industry and consumers worldwide. Being a polygenic trait, its enhancement requires a systematic understanding of their genetic complexity. Molecular genetics offered valuable solutions to the challenging endeavours of slow genetic gains in conventional potato breeding. With the advent of linkage maps, molecular markers and availability of next-generation sequencing (NGS) platforms, the plant breeding programmes worldwide have achieved faster genetic gain due to marker-assisted selection (MAS). Linkage mapping detects QTLs in biparental population; alternatively, genomic and phenotypic differences can be identified by extensive genotyping and phenotyping of a germplasm panel depicting natural biological diversity to reveal QTLs, in other words, marker-trait associations. Due to advancements in the fields of genome sequencing and bioinformatics, researchers have preferred to use the genome-wide association mapping (GWAS) method for detecting QTLs due to its higher resolution. In potato, GWAS identified causative allele(s)/loci and provides reliable platform for the development of diagnostic SNP markers by employing Infinium SolCAP SNP array. Later, KASP validation markers can be developed to be used as selection markers in order to bred improved cultivars. The current review focuses on recently used approaches for genetic analyses (linkage mapping or association mapping) regarding potato tuber quality traits, provides comprehensive knowledge about breeding, genetic gain, basic genetic and statistical GWAS concepts and subsequently highlights the genetic discoveries using GWAS and KASP markers.Öğe Recent advances in potato genomics, transcriptomics, and transgenics under drought and heat stresses: a review(TUBITAK SCIENTIFIC & TECHNICAL RESEARCH COUNCIL TURKEY, 2015) Aksoy, Emre; Demirel, Ufuk; Ozturk, Zahide Neslihan; Caliskan, Sevgi; Caliskan, Mehmet EminSustainable potato production practices are crucial for food security and social sustainability in the future since potato is a highly nutritious food and it is considered as one of the most promising crops to reduce human hunger and poverty in the world due to its high yield potential. However, being a temperate crop, potato is exposed to various environmental stresses, including extended periods of drought and heat. The majority of potato genomics, transcriptomics, and transgenics studies concentrate on the characterization of molecular mechanisms governing cold hardiness of tubers and response and tolerance mechanisms against diseases. Likewise, potato breeding studies focus on increasing the yield, extending the postharvest storage, and developing cultivars that withstand biotic stresses. The number of genomics, transcriptomics, and transgenics studies of drought and heat tolerance in potato is limited, although they are necessary state-of-the-art research procedures to characterize and identify the regulatory mechanism underlying any stresses in order to develop new crop varieties that can tolerate harsh environmental conditions. For these reasons, this review focuses on recent advances in genomics, transcriptomics, and transgenics of drought and heat tolerance in potato.Öğe Responses of yield, quality and water use efficiency of potato grown under different drip irrigation and nitrogen levels(Nature Portfolio, 2023) Akkamis, Mustafa; Caliskan, SevgiProper irrigation and fertilization are essential for achieve high tuber yield and quality in potato production. However, the high cost of these inputs necessitate optimization of their use to improve both water use efficiency and crop productivity. This study aimed to investigate the impact of irrigation and nitrogen fertilization on potato yield, quality and water use efficiency. The research included different drip irrigation treatments (100%, 66%, and 33% of field capacity) and nitrogen levels: 0 (N0), 100 (N1), 200 (N2), 300 (N3), 400 (N4) and 500 (N5) kg N ha(-1). The results indicated that potato yield and growth were more sensitive to irrigation treatment than nitrogen levels. Full irrigation with 300 kg N ha(-1) produced the highest total tuber yield, while low irrigation treatments resulted in significantly lower yields. In contrast, the 66% field capacity irrigation treatment consistently had the highest water use efficiency in both years of the study. Furthermore, the study showed that the quality characteristics of the tubers were negatively impacted by full irrigation treatments compared to low irrigation. These findings suggest that with appropriate irrigation and nitrogen application, potatoes can be produced with acceptable yields while conserving water and minimizing nitrogen use. This research emphasizes the importance of optimizing inputs to improve water use efficiency and yield productivity while reducing water. As a result, obtaining useful information on crop management for farmers to make informed decisions may be possible by achieving optimal irrigation and nitrogen levels.Öğe ROW AND PLANT SPACING EFFECTS ON THE YIELD AND YIELD COMPONENTS OF SAFFLOWER IN A MEDITERRANEAN-TYPE ENVIRONMENT(Soc Field Crop Sci, 2018) Caliskan, Sevgi; Caliskan, Mehmet EminThis study was conducted to determine the effects of inter-row and intra-row spacing on two safflower cultivars under the Eastern Mediterranean conditions in Hatay, Turkey during 2010-2011 and 2011-2012 growing seasons. The field experiments were laid out in a split split plot design with three replications with two cultivars (Dincer and Remzibey) as a main plots, four inter-row spacing (15, 30, 45 and 60 cm) as sub-plot and three intra-row spacing (5, 10 and 15 cm) as sub-subplot. Seed yield and yield-related traits were lower in both cultivars in 2012 comparing to previous year probably due to lower rainfall. Two years' data indicated that cultivars, inter-row and intra-row spacing significantly affected growth, yield and yield components of safflower. Increasing plants population reduced yield components and yield of individual plants, but increased yield per unit area. Low plant density resulted in significantly higher branches/plant, heads/plant, seeds/head. The highest seed yields per hektare were obtained with sowing safflower cultivars at 5 cm intra-row spacing in 45 cm spaced rows in 2011, and in 30 cm spaced rows in 2012. Our results indicated that higher plant density can be advantageous under yield limiting conditions while sowing winter safflower at 45 x 5 cm inter- and intra-row spacing can be recommended for regular seasons in Mediterranean-Type Environments.Öğe Soybean: A new frontier in understanding the iron deficiency tolerance mechanisms in plants(Springer, 2017) Aksoy, Emre; Maqbool, Amir; Tindas, Ilknur; Caliskan, SevgiSoybean (Glycine max L.) is an agronomic crop belonging to the legume family, and is the top second plant species with the highest iron (Fe) content. When exposed to Fe-deficiency during growth in the field, soybean yields are negatively affected from impaired chlorophyll biosynthesis, which is called as Fe-deficiency chlorosis (IDC). Although IDC in soybeans has been observed for years, the molecular studies to develop IDC-tolerant soybean cultivars were slower compared to the studies of other plant species. Recently, there are efforts to understand the molecular mechanisms behind IDC tolerance and use them to develop IDC-tolerant soybeans via molecular breeding and transgenic approaches. Genetic transformation of soybean is relatively easy, and loss-of-function mutant collections are readily available. There is a divergence in IDC tolerance among soybean cultivars, suggesting a potential improvement of soybean tolerance to IDC via molecular breeding. This mini review covers the latest developments in the field of soybean research to elucidate the molecular mechanisms of IDC tolerance. Soybean should be used a new model plant in understanding the Fe-deficiency tolerance mechanisms especially because of its high potential to be used as a bio-fortified crop to treat the iron deficiency in humans in the future.Öğe The lepidopteran pests of sweet potato: First record of Helcystogramma triannulella (Herrich- Schaffer) (Lepidoptera: Gelechiidae) with population development and natural enemies in Turkey(ENTOMOLOGICAL SOC TURKEY, EGE UNIV, 2016) Kaya, Kamuran; Can Cengiz, Feza; Caliskan, Mehmet Emin; Caliskan, SevgiThe study was conducted in Hatay Province, east Mediterranean Region, Turkey in 2012 and 2013 to determine major lepidopteran pests of sweet potato and to document the population development of the newly recorded species Helcystogramma triannulella (Herrich-Schaffer) (Lepidoptera: Gelechiidae) in 2013. Four lepidopteran species, Aedia leucomelas (L.) (Noctuidae), Agrius convolvuli (Linnaeus) (Sphingidae), Hydriris ornatalis (Duponchel) (Crambidae) and H. triannulella were found. This was the first detection of H. triannulella in Turkey, so its population development was studied in the second year. The larval population of H. triannulella began to increase towards the end of July and reached its peak in mid-August. During the study, predators, Hippodamia variegata (Goeze), Oenopia conglobata (L.), Scymnus interruptus (Goeze), Scymnus mediterraneus Khnzorian, Stethorus gilvifrons (Mulsant) (Coleoptera; Coccinellidae); Nabis viridulus Spinola (Hemiptera: Nabidae) were found in the folded parts of the leaves, and parasitoids, Apanteles sp., Chelonus sp. (Hymenoptera: Braconidae) and Compsilura concinnata (Meigen) (Diptera: Tachinidae) were obtained in the laboratory from larvae of H. triannulella.
