Browsing by Author "Kaydan, Digdem"

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Alleviation of Osmotic Stress of Water and Salt in Germination and Seedling Growth of Triticale With Seed Priming Treatments
(Academic Journals, 2008) Yagmur, Mehmet; Kaydan, Digdem
Effects of seed priming treatments with 0.5% KH2PO4 (w/v) solution and water were determined on germination and seedling characters of hexaploid triticale (Triticosecale Witm., cv. Presto) in different osmotic potential of NaCl and PEG solutions. Drought and salt osmotic stress conditions were separately created by using PEG 6000 and NaCl, respectively, at different osmotic potentials (-0.45, -0.77, -1.03 and -1.44 MPa and control). At the equivalent osmotic potential, the effects of PEG 6000 were more harmful than NaCl on germination and seedling stage. Germination percentage and seedling growth and also relative water content (RWC, %) decreased with the decrease in osmotic potential of PEG 6000 and NaCl. But root-to-shoot length ratios increased with the effects of osmotic stress of PEG 6000 and NaCl. Despite the negative effects of two stress conditions, the two priming treatments were effective in improving germination percentage and seedling growth in Presto. But seed primed treatment was effective at the lowest osmotic potentials; therefore, seedling growth survived at the highest concentrations. Consequently, the effect of hydropriming is very pronounced particularly in improving germination and seedling growth in low stress.
The Effects of Different Sowing Depth on Grain Yield and Some Grain Yield Components in Wheat (Triticum Aestivum L.) Cultivars Under Dryland Conditions
(Academic Journals, 2009) Yagmur, Mehmet; Kaydan, Digdem
The aim of the current study was to determine the effects of sowing depths (3, 5, 7, 9 cm) on grain yield and yield components for wheat cultivars during 2004-2006 at one site in Van Province in Eastern Turkey. Grain yield and yield components were found to positively correlate with coleoptile length, with marked declines observed in grain yield and yield components among varieties with shorter coleoptiles in deepest sowing. Wheat sown at 5 cm gave greater yields than wheat sown at 3, 7 and 9 cm by 19.9, 22.3 and 62.5%, respectively. The highest grain yield (2.98 T ha(-1)) was obtained with the Alparslan cultivar sown at a depth of 5 cm. Grain yield of all varieties tested was drastically reduced when sown at depths of 9 cm, with the exception of the local Tir and Alparslan varieties, both of which, when compared to the other varieties tested, had longer coleoptiles.
Effects of Salicylic Acid on the Growth and Some Physiological Characters in Salt Stressed Wheat (Triticum Aestivum L.)
(Ankara Univ, Fac Agr, 2007) Kaydan, Digdem; Yagmur, Mehmet; Okut, Nese
This study was conducted to determine the effects of seed soaking in salicylic acid (10(-2) mol/L, 10(-4) mol/L, 10(-6) mol/L and control) on the growth and some physiological characters in wheat (Triticum aestivum L.) under salinity (8 ds m(-1)) and non salinity conditions. NaCl reduced the emergence percentage, the growth parameters (shoot and root dry weight), K+/Na+ ratio, osmotic potential and photosynthetic pigments (Chl a, b and carotenoids) contents in wheat seedlings. The emergence percentage was not changed, in contrast, shoot and root dry weight of seedlings, K+/Na+ ratio, photosynthetic pigments (Chl a, b and carotenoids) contents and osmotic potential were increased by salicylic acid treatments under non salinity condition. Seed soaking in SA increased the emergence percentage, osmotic potential, shoot and root dry weight, K+/Na+ ratio, photosynthetic pigments (Chl a, b and carotenoids) contents in the salinity stressed wheat seedlings. These results were indicated that SA has positive effects on plant growth in salinity and non salinity conditions. But the effects of SA was higher on emergenge percentage, K+/Na+ ratio and osmotic potantial in salinity condition compared to non salinity condition was obtained in this study.
Effects of Sowing Methods and Rates on Weeds, Grain Yield and Some Yield Components of Wheat
(Ankara Univ, Fac Agr, 2011) Kaydan, Digdem; Tepe, Isik; Yagmur, Mehmet; Yergin, Reyyan
This research was conducted to determine the effects of different sowing rates (450, 550 and 650 seed m(-2)) and sowing methods (sowing to the rows, broadcasting to seeding depth and contrary rows with 90 degrees) on weeds, grain yield and some yield components of wheat local "Tir" variety (Triticum aestivum L. ssp vulgare Vill. v. leucospermum Korn) under dryland condition of Van in 2006-07 and 2008-09 winter growing seasons. It was found that contrary rows with 90 degrees unaffected to reduce weeds density but it was highly effective sowing methods to decrease weeds biomass. However, higher seeding rates, in the current study, reduced insignificantly weeds density, but it reduced weed biomass. In the current study, sowing methods and seeding rates significantly affected grain yields and yields components. The highest grain yield was obtained 650 seed m(-2) and sowing to contrary rows with 90 degrees.
Germination, Seedling Growth and Relative Water Content of Shoot in Different Seed Sizes of Triticale Under Osmotic Stress of Water and Nacl
(Academic Journals, 2008) Kaydan, Digdem; Yagmur, Mehmet
Effect of seed size ( small, medium and large) on germination and seedling growth of triticale (xTriticosecale Witm. cv. Presto) at the different osmotic potential of NaCl and PEG solutions were determined in the present study. Germination tests were conducted under five osmotic potential levels (-0.45, -0.77, -1.03, -1.44 MPa, and Control) of PEG 6000 and NaCl. Germination percentage (%) at 4 and 8(th) days and also seedling growth traits such as root and shoot length ( mm), dry root and shoot weight (mg), root : shoot length ( R: S) ratio, and relative water content of shoot (RWC, %) were investigated in this study. The results indicated that decreases in the osmotic potentials caused a reduction in germination percentage and seedling growth. It was seen that drought created by PEG 6000 had more negative effects on germination and seedling growth than that of NaCl. In consequence, the total germinability and seedling growth were higher in large seeds rather than in small seeds in control solution and under osmotic stress. In addition, it was observed that seedlings obtained from larger seeds survived even at the lower osmotic potential of PEG and NaCl; whereas, seedling obtained from small seeds did not survive in the intensive stress.
Plant Growth and Protein Ratio of Spring Sown Chickpea With Various Combinations of Rhizobium Inoculation, Nitrogen Fertilizer and Irrigation Under Rainfed Condition
(Academic Journals, 2011) Yagmur, Mehmet; Kaydan, Digdem
In the present study, it was aimed to determine the effects of different combination of rhizobium inoculation, nitrogen application and irrigation on nodule dry weight, protein ratio and seed yield of spring sown chickpea (Cicer arietinum L. cv ILC 482). The field experiment was carried out for two consecutive seasons in Van, Turkey in summer growing seasons of 1999 and 2000. All combinations influenced seed yield and yield components, therefore, there were highly significant differences in plant height (cm), number of branches per plant (plant(-1)), number of pods per plant (pods plant(-1)), number of seed per plant (seed plant(-1)), seed yield (kg ha(-1)), and protein ratio (%). The combination of nitrogen (60 kg N ha(-1)) and irrigation had the highest seed yield. Moreover, this combination was followed by the combination of inoculation and nitrogen (20 kg N ha(-1)) and irrigation (In-1+N-1+Ir-1). In contrast, the combination of uninoculation, no nitrogen application and nonirrigation (In-0+N-0+Ir-0) had the lowest seed yield. Moreover, the results obtained from the combination of inoculation, nitrogen (20 kg N ha(-1)) and irrigation was comparable to that of the combination of nitrogen (60 kg N ha(-1)) and irrigation for seed yield. Therefore, the combination of inoculation and nitrogen (20 kgN ha(-1)) and irrigation treatment can be use instead of the combination of nitrogen (60 kg N ha(-1)) and irrigation in chickpea production for achieving higher seed yield in rainfed condition. It is concluded, that nitrogen or inoculation has superior performance in seed yield and protein ratio under irrigation compared to those of nonirrigation conditions.
A Research on Yield and Yield Components of Some Bread Wheat (Triticum Aestivum L.) Varieties in Van Ecological Conditions
(Ankara Univ, Fac Agr, 2008) Kaydan, Digdem; Yagmur, Mehmet
Grain yield and some yield components of sixteen bread wheat cultivars (Tir, Bezostaja, Gerek-79, Kutluk-94, Kirgiz-95, Suzen-97, Aytin-98, Harmankaya-99, Altay-2000, Dagdas-94, Lancer, Dogu-88, Karasu-90, Palandoken-97, Nenehatun and Alparslan) were determined in this study that were conducted during the 2005-2006 and 2006-2007 growing seasons in Van ecological conditions. Significant differences were determined in grain yield and yield components among wheat cultivars in two years. According to two year average, days to headings ranged between 180.75 (Aytin-98) and 190.62 (Karasu-90) days; grain filling duration, 33.12 (Lancer) - 39.25 (Gerek-79 and Alparslan) days; spike number per m(2), 265.2 (Tir) - 412.2 (Dogu-88), spike lenght, 5.72 (Aytin-98) - 7.27 (Nenehatun) cm; plant height, 66.0 (Harmankaya)- 86.05 (Tir) cm; grain number per spike, 20.32 (Gerek-79) - 27.47 (Harmankaya); grain weight per spike, 0.65 (Alparslan) - 0.93 (Harmankaya) g; thousand grain weight, 29.26 (Aytin-98) - 37.45 (Tir) g; grain yield, 167.07 (Tir) - 238.36 (Dogu-88) kg/da. It was concluded that Dogu-88, Nenehatun and Alparslan bread wheat cultivars were promising cultivars in Van regional conditions.
A Research on Yield and Yield Components of Some Two-Rowed Barley Varieties (Hordeum Vulgare L. Conv. Distichon) in Van Ecological Conditions
(Ankara Univ, Fac Agr, 2007) Kaydan, Digdem; Yagmur, Mehmet
This research was conducted during the 2004-2005 and 2005-2006 growing seasons at one site in Van Province. The experimental design was a randomized complete block with four replications and thirteen barley cultivars (Tokak 157/37, Tarm-92, Orza-96, Bulbul-89, Yesevi-93, Aydanhanim, Kalayci-97, Karatay-94, Efes-3, Efes 98, Anadolu 98, Cildir-02 and Zeynelaga) were used in the study. There were significant differences in tested characters among barley cultivars. According to two-year average, 2 days to headings ranged between 179.3 (Tarm-92) and 189.7 (Bulbul 89) days; spike number per m(2), 249.3 (Aydanhanim)- 560.7 (Tarm-92); culm length 51.2 (Cildir-02) -64.9 (Karatay-94) cm; spike length 5.83 (Kalayci-97))- 7.26 (Aydanhanim) cm; grain number per spike 16.32 (Tarm-92)-20.24 (Efes-98); grain weight per spike 0.73 (Tarm-92)- 0.99 (Aydanhanim) g; thousand grain weight 41.70 (Tarm-92)-46.32 (Aydanhanim) g; seed yield 197.30 (Zeynelaga)-319.70 (Tarm-92) kg da(-1) and harvest index 23.11 % (Yesevi-93)- 36.43 % (Kalayci-97). It was concluded that cv Tarm-92, cv Orza-96, cv Tokak 157/37 and cv Bulbul-89 had higher yield than other cultivars in Van regional conditions.