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    The assessment of boron toxicity tolerance in F-6 RILs of durum wheat [Triticum turgidum (L.) Tell. convar. durum (Desf.) Mackey]
    (Springer Heidelberg, 2021) Gocmen Taskin, Belgin; Ozbek, Ozlem; Keskin San, Sibel; Nachit, Miloudi Mikael; Kaya, Zeki
    The identification of new genotypes tolerant to the boron toxicity is very important for the breeding programs carried out in the arid and semiarid regions of West Asia and North Africa region. This study aims to determine the genotypes tolerant to the boron toxicity in 141 F-6 recombinant inbred lines (RILs) of durum wheat. 141 RILs were characterized in terms of their tolerance to boron toxicity using the parameters: 1-5 scale of symptom score, dry matter yield, biomass reduction, tissue boron concentration. The component of variance varied from 0.69 to 0.95. 22 RILs tolerant for 1-5 scale, 121 RILs ranged from moderately tolerant to tolerant for the biomass reduction, 22 RILs moderately tolerant for the tissue concentration, and 75 RILs varied from moderately tolerant to the most tolerant for the boron content. The B toxicity evaluation parameters used in this study are efficient when they are used all together, and they produced fast and reliable results. However, the principal component analyses displayed that BC, DMY (%) and BR parameters were the most effective and reliable for the evaluation of B toxicity tolerance. The RILs represented a wide range of the genetic variation in response to the B toxicity treatments. The boron toxicity tolerance could be improved by the breeding studies.
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    Variation in cold tolerance in F-6 durum wheat [Triticum turgidum (L.) Tell. convar. durum (Desf.) Mackey] RILs and the relationships of cold tolerance with some quality parameters and genetic markers
    (Cambridge Univ Press, 2020) Taskin, Belgin Gocmen; Ozbek, Ozlem; San, Sibel Keskin; Eser, Vehbi; Nachit, Miloudi Mikael; Kaya, Zeki
    Low temperature is one of the critical factors for determining agricultural production. Therefore, the main objective was to develop the durum wheat lines, which are tolerant to cold particularly in Central Anatolia. The recombinant inbred lines (RILs) (141) derived from F-6 progeny of durum wheat, developed from Kunduru-1149 (female parent) and Cham-1 (male parent) cross, were characterized in terms of their cold tolerance both in the field and under controlled (in growth chamber) conditions. A 0-9 scale was used for the visual evaluation of cold damage under field conditions, and a quantitative measure of photochemical efficiency (Fv/Fm = variable fluorescence/maximum fluorescence) method was used for the evaluation of cold damage under controlled conditions. Seventeen RILs displayed the scores within the range of 1-2.5 in 0-9 scale evaluation, while 41 RILs showed the scores equal to or higher than 0.70 approaching to optimal (similar to 0.83) in Fv/Fm evaluation. Some quality parameters tested and some gliadin fragments and random amplified polymorphic DNA loci showed meaningful correlations with the data of 0-9 scale and Fv/Fm ratios from lower to the medium level. The RILs considered as cold resistant; might have the potential to be used as parental lines to develop cold-resistant durum wheat varieties in the future durum wheat-breeding programmes.