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    Improvement of grain yield and yield associated traits in bread wheat (Triticum aestivum L.) genotypes through mutation breeding using gamma irradiation
    (Namik Kemal University - Agricultural Faculty, 2019) Balkan, Alpay; Bilgin, O?uz; Başer, Ismet; Balaban Göçmen, Damla; Demirkan, Alp Kayahan; Deviren, Birol
    The present research was conducted to evaluate the M1, M2, M3 and M4 bread wheat (Triticum aestivum L.) mutant populations for yield and yield related traits during 2010-11, 2011-12, 2012-13 and 2013-14 at Tekirda? ecological conditions. Three wheat genotypes were treated with different levels of gamma rays (100 Gy, 200 Gy, 300 Gy, 400 Gy, 500 Gy and Control). The mutated plants were evaluated along with parental lines (control) for grain yield (GY) and its contributing traits such as plant height (PH), spike length (SL), the number of spikelets per spike (NSPS), the number of grains per spike (NGPS), grain weight per spike (GWPS), harvest index (HI) and thousand grain weight (TGW) under field conditions. The results obtained from the present study showed that the genotypes significantly and variably differed in their response for various traits at different gamma rays doses. The traits such as PH, TGW and grain yield (GY) showed generally reduction with higher gamma irradiation doses as compared to low doses, while mutagenic treatments shifted the mean values mostly towards the negative direction in the other yield components. But, the negative or positive shifts were not unidirectional or equally effective for all the traits. These findings suggested that the variability could be induced through the use of gamma irradiations in bread wheat. Some of the traits showed improvement due to the induced mutations could be used in future wheat breeding programs. The differences in mean values and the nature of variability observed in M2 indicated a possible preference of selection in M3 generation. © This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (https://creativecommons.org/licenses/by-nc/4.0/). Tekirda? 2019.
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    THE EFFECTS OF WATER STRESS ON GRAIN YIELD AND YIELD COMPONENTS IN BREAD WHEAT
    (Academic Publishing House, 2024) Başer, Ismet; Akseki, Seher Semerci; Göçmen, Damla Balaban; Balkan, Alpay; Bilgin, Oguz
    The study was carried out with 24 wheat genotypes at different drought levels. The 24 genotypes used in the study were determined based on data from 45 genotypes at drought levels created with PEG. The experiment was carried out in plastic tubes 30 cm wide × 70 cm high. In the study, plant height, spike length, number of spikelets per spike, number of grains per spike, grain weight per spike, root length and root weight were investigated. When the plants were grown in tubes with 100%, 75%, 50%, and 25% field capacity, the highest values for all properties, except plant height, were obtained in plants with 100% field capacity. According to the data obtained, Bora, NKU Ergene, Enola and Rumeli were least affected by drought, while LG 59, Adelaide and Kavlıca genotypes were most affected by drought. Root length increased with drought and the longest roots were at 25% field capacity, which was the highest level of drought. The root weight was highest at 100% field capacity and lowest at 25% field capacity. Spike length, number of spikelets per spike, number of grains per spike, and grain weight per spike decreased significantly as the level of drought increased. © 2024 Academic Publishing House. All rights reserved.