Browsing by Author "Kabay, T."

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The Effect of Drought Stress on Plant Development in Some Landraces and Commercial Tomato Genotypes
(Centenary University, 2017) Alp, Y.; Kabay, T.
One of the important factors that adversely affect tomato production is drought. As well as reducing yield and quality of tomato production, drought also reduces farmer’s income. One of the most important ways of alleviating its adverse effects is to determine the varieties that are tolerant to drought. For this reason, our study aimed to determine the tolerance of the varieties to drought. Accordingly, three hybrids varieties, three standards varieties and three landraces were used in the study. Tomato seeds were planted in a 2 litres-pot that contains 1:1 mixture of peat + perlite. After the cotyledon leaves busted out, the plant was irrigated with the Hoagland nutrient solution. While irrigation was carried on the control plants until the end of the application, irrigation was suddenly halted during the seedling period in the plants that are exposed to drought. After 12 days, plant fresh and dry weights, growth rates, leaf numbers, stem diameters, plant weights, 0-5 scale values, membrane damage indices and leaf proportional water contents were investigated. It was observed that there were significant differences in these parameters examined for the determination of tomato varieties that are tolerant and sensitive to drought stress. © 2017, Centenary University. All rights reserved.
Effects of Drought Stress on Plant Growth Parameters, Membrane Damage Index and Nutrient Content in Common Bean Genotypes
(Pakistan Agricultural Scientists Forum, 2017) Kabay, T.; Erdinc, C.; Sensoy, S.
Common bean (Phaseolus vulgaris L.) is an important crop in both Turkey and the world. Drought is one of the important abiotic stress factors limiting the quality and quantity of common bean. This study was conducted to determine the drought-tolerant and susceptible common bean genotypes in Lake Van Basin of Turkey. Total 48 bean genotypes consisted of 40 genotypes from Lake Van Basin, 6 from different parts of Turkey and 1 drought susceptible varietyZulbiye and 1 drought tolerant variety-Yakutiye. The drought experiment was designed as completely randomized plot with 4 replicates in plastic greenhouse conditions. The four-week-old bean seedlings were subjected to drought stress by completely stopping irrigation for 8 days compared to control seedlings. The investigated traits were growth rate, fresh and dry shoot weights, fresh and dry root weights, stem diameter, area and number of leaves, leaf relative water content (LRWC), membrane damage index (MDI), and ion contents (K, Ca and Na) beside the 0-5 visual scale assessment of drought. At the end of the study, it was determined that plant growth and development of the bean genotypes were negatively affected by drought; however, the studied bean genotypes reacted variously to this stress factors. The genotypes V7, V15, V33, V82, V89 and V-A1 were found to be drought sensitive as the variety Yakutiye, while the genotypes V21, V62, V69, V71, V86, V95 and T7 were found to be drought tolerant as the variety Zulbiye.
Effects of Low Temperatures on Enzyme Activity, Chlorophyll and Ion Contents in Common Bean Genotypes
(Corvinus Univ Budapest, 2018) Kabay, T.
Low temperatures slow down plant growth and development and generate physiological damages on plants. Metabolism of largely produced and consumed common bean (Phaseolus vulgaris L.) plants decelerates at temperatures below 15 degrees C. This study was carried out at Van Yuzuncu Yil University in Van province of Turkey with limited vegetation period due to its cold climate in winter. In this study, the bean plants were subjected to low temperature stress and catalase (CAT), super oxide dismutase (SOD), ascorbate peroxidase (APX) enzyme activities, malondialdehyde (MDA), chlorophyll-a, chlorophyll-b and total chlorophyll, K, Ca, and Mg ion contents of low temperature stress-tolerant Yakutiye and C30 and low temperature stress-sensitive Zulbiye and C13 bean genotypes were measured on 25th, 30th, 35th and 40th days of low temperature stress. Four bean seeds were sown in 2-liter pots filled with 2:1 peat:perlite mixture as to have 2 plants in each pot. The pots were irrigated with Hoagland nutrient solution. Low temperature stress plants were sown on 15th of March with low outdoor temperatures. In control group, been seeds were sown on 25th of April and plant samples were taken in again 5-day intervals in 4 periods (25th, 30th, 35th and 40th days of growth). Significant differences were observed in enzyme activities, chlorophyll contents and ion contents of low temperature-tolerant and sensitive bean genotypes in 4 measurement periods.
Effects of Potassium Applications on Changes of Chlorophyl, Ion and Enzyme Activity in Heat Sensitive Bean Genotypes
(Centenary University, 2018) Kabay, T.
One of the most important problems in greenhouse production is the negative effect of high temperature. High temperature that is one of the stress factors negatively affects quality and yield in the cultivation of greenhouse bean. This study aimed to reduce yield and quality losses due to high temperature during production period. In this study, which investigated the effectiveness of potassium applications, Zulbiye bean variety were used that it is sensitive to high temperature stress and the V71 genotype investigated in our previous studies were used that it is sensitive to high temperature stress. Bean seeds were planted in 2-liter pot containing a 2: 1 mixture of peat and perlite. Doses of potassium (K) were in the form of 0 (control) ppm, 500 ppm, 1000 ppm and 2000 ppm, and the study was performed in the four repetitions and four pots in each repetition, and two plants in each pot, according to the factorial experimental design. Plants were irrigated with the Hoagland nutrient solution from bean seeds were planted to the end of the study. When it reaches 24 days from planting, the temperature of the control plants varies between 20-25 0 C in the greenhouse, whereas plants applied high temperature were taken an additional tunnel in the green house. In order to be able to see the effect of stress on the bean plants, in the bean genotypes, CAT, SOD, APX, MDA, chlorophyll a, chlorophyll b, total chlorophyll, K, Ca and Mg contents changes were examined. In conclusion, in the study investigating the effect of different doses K applications on tolerance to high temperature in beans, especially 1000 ppm K dose might be used to reduce adverse effects of high temperature. © 2018, Centenary University. All rights reserved.
Effects of Salt Stress on Some Nutrient Content and Total Antioxidant and Total Phenol Content in Different Bean Genotypes
(Centenary University, 2019) Kipçak, S.; Ekıncıalp, A.; Erdınç, Ç.; Kabay, T.; Şensoy, S.
In this study, the effects of salt stress on 20 bean genotypes collected from Lake Van Basin were investigated. The salt application was treated in 0 mM, 25 mM and 50 mM NaCl concentrations, and then the plants were grown in growth chamber conditions. To determine the effect of stress, total antioxidant capacity, total phenolics and some nutrient elements content (P, Mg, Fe, Cu, Mn and Zn) were evaluated. In the parameters examined in terms of tolerance to the salt, the genotypes showed different responses. When the rate of change of the plants response to salt stress according to control was examined, it was determined that with the increase in salt doses, total phenolic and total antioxidant capacity decreased at high rate and salt stress had a negative effect on genotypes. It was found that the contents of P in both doses and Fe at 50 mM were increased in shoot, while the contents of Mg, Cu and Zn at 25 mM and 50 mM, Mn at 50 mM were decreased. In the root, the contents of Fe, Mg and Mn were decreased at 25 mM, and P, Mg, Cu, Mn and Zn contents were detected to increase with the increase in salt doses as well as. The genotypes G9 and G30 showed high levels of tolerance in both salt concentrations and the genotypes G31, G49 and G94 were found to be sensitive to both 25 mM and 50 mM salt concentrations. © 2019, Centenary University. All rights reserved.
Enzyme, Chlorophyl and Ion Changes in Some Common Bean Genotypes by Drought Stress
(Centenary University, 2016) Kabay, T.; Şensoy, S.
In recent years, as a result of the increase in drought, one of the most important abiotic stress conditions, large declines have been observed in the yield and quality of agricultural products. The solution will be much easier if the drought damage in crops has to be defined well. Scientific studies have been carried out in order to minimize the decrease in yield and quality. The present study aimed to determine the enzyme and ion changes in common bean, an important product consumed and enjoyed a lot in the world and our country, during drought stress. Drought stress has been created by cutting irrigation water gradually for common bean plants grown in pots containing 2:1 peat + perlite mixture. The enzyme and ion level changes in the drought tolerant (Yakutiye and V-a1) and in drought sensitive (Zulbiye and T7) bean genotypes have been analyzed in five different periods of drought stress. The changes in the level of catalase (CAT), superoxide dismutase (SOD), ascorbate peroxidase (APX), malondialdehyde (MDA), chlorophyll-a, chlorophyll-b, the total chlorophyll, K, Ca and Na were examined on the 0th, 2nd, 4th, 6th and 8th days of the drought stress. Obvious differences have been observed for these examined parameters in drought tolerant and susceptible genotypes. © 2016, Centenary University. All rights reserved.