Salt stress is one of the harmful abiotic stress factors. It makes agricultural lands especially in arid and semi-arid regions useless despite the efforts. More than six percent of total world agricultural lands are on the edge of vanishing due to salt stress. Salinity in soil occurs as a result of the factors such as lack of drainage, improper irrigation, excessive accumulation of soluble salts. Salinity limits the growth of plants. Despite the main results, some results of plants due to these limitations vary from species to species. The negative effects get morphological, biochemical and physiological reactions from plants. Slowed or stopped growth of roots and shoots, closuring of stomata, germination slowing, decreased or stopped development of seedling, deterioration of photosynthetic activity are the main reactions of plants to stress. On the other hand, plants also develop tolerance mechanisms as a result of some auxiliaries for surviving under adverse conditions. Plants have tendency to protect themselves from salinity with osmotic protectants synthesized by them such as sugars, proline, amino acids, glycine betaine. In this review, the responses of plants to salt stress were investigated and gathered.
Sunflower (Helianthus annuus L.) is the main raw material used to produce oil for consumption and oilseed in Turkey; however, its production is not sufficient, even for only domestic consumption. Therefore, studies were needed to determine how to increase both the production area and yield in Turkey. The aim of the study was to evaluate the possible effects of climate changes on future sunflower yield. A total of 29 provinces with intense sunflower cultivation during years of 1985-2014 were evaluated. Sunflower production values and meteorological data, which belong to years of 1985-2014, on climate projections, based on HadGEM2-ES Global Climate Model and RCP8.5 scenario that cover period of 2016-2099, were used as material. In the first part of the study, linear regression analyses were conducted between the observation and production data using the least squares method. In the second part, the possible effects of climate changes on sunflower yield for 2016-2040, 2041-2070, and 2071-2099 were determined using regression equations and climate projection data. Projections indicate that decreases in yield are expected, especially in the second half of this century. In Tekirdag and Konya provinces, where there is intensive sunflower cultivation, severe decreases in yield are expected for all studied periods.
Seed germination and seedling emergence is the main step of cultivation and improving them could yield high performance in the field. Improved seedling emergence means less sensitivity to biotic and abiotic stress factors. It is possible to enhance seedling emergence via different technologies. Nanoparticles are one of the improving technology and their impact on crop cultivation are improving day by day. The seeds of hybrid-snack type cultivar Ahmetbey and for seed treatment agent TiO₂ nanoparticles, produced with a hydrothermal method were used in this experiment. This study was conducted to observe the impact of seed treatment with different titanium dioxide (TiO₂) nanoparticles (NPs) concentrations (6, 12, and 24 mg Lˉ¹ ) with dimensions of 20-50 nm during 8 hours on the emergence and seedling growth performance of snack-type sunflower cultivar Ahmetbey. Four replicates of 50 seeds in each treatment were sown in plastic trays 4 cm deep and placed in a growth chamber (Sanyo versatile Growth chamber, Japan) at 20 ± 2 °C 45 μM photons m-² s-¹ light for 16 h. Mean emergence time (MET), emergence percentage, seedling vigor, root-to-shoot length ratio, shoot length, and root length seedling fresh and dry weight were measured. Emergence percentage, shoot length, root length, and fresh and dry weight of seedlings increased with TiO₂ NPs treatments. The results revealed that 8-hour priming with water has a low impact on seeds of cv. Ahmetbey compared to any treatment of TiO₂ NPs.
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