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    The assessment of tomato fruit quality parameters under different sound waves
    (Springer India, 2019) Altuntas, Ozlem; Ozkurt, Halil
    Sound stress is an abiotic stress factor wherein the sound wave form affects the growth and development of plants as an alternative mechanical stress. To explore this, 10-week-old tomato (Solanum lycopersicum) plants were used in this experiment. The tomato plants were exposed to three different frequency values consecutively: 600Hz in the first week, 1240Hz in the second week and 1600Hz in the third week. The decibel (dB) value was adjusted to 90dB in the sound amplifier. At the end of the experiment, lycopene, vitamin C, total sugar, total acid and total phenol levels were analysed and pH and (0)Brix were measured in tomato fruits. As a result, it was determined that as the sound frequency intensity level increased, the concentration of fruit parameters also increased: lycopene, vitamin C, total sugar, total acid and total phenol. The total phenol content, lycopene content and ascorbic acid of the tomato plants that were exposed to sound waves at different frequencies increased at a rate of 70%, 20% and 14%, respectively. According to the results of all measured parameters in tomato fruits, 1600Hz has been determined the best of sound wave frequency value.
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    EFFECTS OF SALINITY STRESS ON CHLOROPHYLL AND CAROTENOID CONTENTS AND STOMATA SIZE OF GRAFTED AND UNGRAFTED GALIA C8 MELON CULTIVAR
    (Pakistan Botanical Soc, 2017) Yarsi, Garip; Sivaci, Aysel; Dasgan, H. Yildiz; Altuntas, Ozlem; Binzet, Riza; Akhoundnejad, Yelderem
    Salinity is known as the most important abiotic stress that decreases crop production and plant growth, and changes the anatomy and morphology of plants. In this study, the growth rate of grafted and ungrafted melon plants were studied under salinity stress. Maximus F-1, Shintoza F-90 F-1 and Nun 9075 F-1 (Cucurbita maxima x Cucurbita moschata) were used as a rootstock and Galia C8 melon cultivar was used as a scion. In this study, the stomata size and chlorophyll and carotenoid contents were investigated. According to the results, chlorophyll and carotenoid contents and stomata length and width of upper and lower surface of leaf were generally reduced under salinity stress.
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    EFFECTS OF SALINITY STRESS ON PLANT GROWTH AND MINERAL COMPOSITION OF GRAFTED AND UNGRAFTED GALIA C8 MELON CULTIVAR
    (Pakistan Botanical Soc, 2017) Yarsi, Garip; Altuntas, Ozlem; Sivaci, Aysel; Dasgan, H. Yildiz
    In this study, the growth performance and mineral composition of grafted and ungrafted melon plants were studied under salinity stress. In this study, the plant biomass such as total fresh and dry weight, roots and shoots length; and Ca2+, K+, Na+ and Cl- content in leaves, shoots and roots were investigated. Salt stress resulted in the decrease of total fresh and dry weight by 41.75% and 53.62% for ungrafted but this ratio was 17.17% and 19.25% for Maximus F-1/Galia, respectively. The amounts of Na+ and Cl- in leaves of ungrafted plants were very high levels than grafted plants. The effect of salinity was less pronounced in grafted melon plants compared with ungrafted melon plants.
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    Quality Parameter Levels of Strawberry Fruit in Response to Different Sound Waves at 1000 Hz with Different dB Values (95, 100, 105 dB)
    (Mdpi, 2018) Ozkurt, Halil; Altuntas, Ozlem
    All living organisms perceive mechanical signals, regardless of their taxonomic classifications or life habits. Because of their immobility, plants are influenced by a variety of environmental stresses, such as mechanical stress, during their growth and development. Plants develop physiological behaviors to adapt to their environment for long-term development and evolution. Sound-induced stressan abiotic stress factoris an example of mechanical stress and is caused by sound waves generated by different sources. This stress has a negative effect on the development and growth of plants. The strawberry plants evaluated in this study were exposed to three different sound intensity levels (95, 100, 105 dB) at a constant frequency of 1000 Hz. In strawberry plants, stress induced by sound waves is thought to trigger increased production of secondary metabolites as a defense mechanism. To determine the effect of sound applications, the fresh and dry weights of the roots and shoots were measured in strawberry plants, and the pH, total soluble solids (Brix), titratable acidity, vitamin C, total sugar, total acid, and total phenols were analyzed in the fruits. Results show that the sound stress, which was produced at a constant frequency (1000 Hz) and different sound levels (95, 100, 105 dB), affects the growth parameters of the plant and several quality parameters of the fruit.
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    Silicon-induced Salinity Tolerance Improves Photosynthesis, Leaf Water Status, Membrane Stability, and Growth in Pepper (Capsicum annuum L.)
    (Amer Soc Horticultural Science, 2018) Altuntas, Ozlem; Dasgan, H. Yildiz; Akhoundnejad, Yelderem
    Salt stress is a major problem worldwide because it decreases yields of many important agricultural crops. Silicon is the second-most abundant element in soil and has numerous beneficial effects on plants, particularly in alleviating stress-related impacts. Pepper is an important crop in the Mediterranean region, but pepper varieties differ in their salinity tolerances. The objective of this research was to test the ability of silicon to mitigate effects of salt stress in both salt-sensitive and salt-tolerant cultivars. Salt damage was evaluated by measuring biomass, photosynthetic-related variables, leaf water potential, and membrane damage. We found that the addition of silicon solute to a growth medium was highly effective in improving plant growth by enhancing photosynthesis, stomatal conductance (g(S)), leaf water status, and membrane stability, which in turn led to higher biomass production in salt-stressed pepper plants, especially in a salt-sensitive cultivar. From an agronomic viewpoint, application of Si may provide economically relevant productivity improvements for salt-sensitive pepper genotypes grown under moderate salinity conditions and for salt-tolerant genotype grown under higher-salinity conditions.