Yazar "Toptas, Irem" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • [ X ]
    Öğe
    ASSESSMENT OF THE GRAIN QUALITY OF WHEAT GENOTYPES GROWN UNDER MULTIPLE ENVIRONMENTS USING GGE BIPLOT ANALYSIS
    (Parlar Scientific Publications (P S P), 2018) Yildirim, Mehmet; Barutcular, Celaleddin; Koc, Mujde; Dizlek, Halef; Hossain, Akbar; Islam, Mohammad Sohidul; Toptas, Irem
    The field experiment was conducted in agricultural research field under the department of field crops, faculty of agriculture, University of Dicle, Turkey (37 degrees 53' N, 40 degrees 16' E) during spring wheat growing season of 2011-12 for assessing the grain yield and quality of sixteen spring wheat genotypes grown under late sown rainfed condition (high temperature combined with drought stress) as compared with early sowing in irrigated condition (favourable environment). The experiment was laid out in a split split plot design with three replications. Two sowing times: early sowing (cool environment) and late sowing (warm environment) were allocated in main plots, sub-plots were in two irrigation conditions (rainfed and irrigation) and finally sub-sub plots were arranged with sixteen spring wheat genotypes. Data on grain weight (GW), grain protein content (GPC), grain starch content (GSC), test weight (TW), Zeleny sedimentation volume (ZT), dry gluten content (DGC), gluten index (GI) and grain flour content (GFC) were determined to know the adverse effect of high temperature in combined with drought stress. The results of the present study indicates that high temperature combined with drought (late sown heat stress condition) significantly influenced the grain yield and quality parameters of all tested wheat genotypes. Grain protein content showed a positive correlations with DGC and ZT, while negative correlation with GW under normal and heat stress conditions. Moreover, a significant negative association was found between GSC and GPC content due to the adverse effect of high temperature in combined with drought stress. These results support that the performance of genotypes 'Inqilab-91', 'Cham-6', 'Adana-99' and 'Meta-2002' were better in respect of the most important traits of grain quality under adverse environment. Therefore, the genotypes may be considered as prospective good candidates for new wheat varieties for cultivation under heat (late sowing) and drought stress (rainfed) conditions of Turkey.
  • [ X ]
    Öğe
    EVALUATION OF SPAD CHLOROPHYLL IN SPRING WHEAT GENOTYPES UNDER DIFFERENT ENVIRONMENTS
    (Parlar Scientific Publications (P S P), 2016) Barutcular, Celaleddin; Yildirim, Mehmet; Koc, Mujde; Akinci, Cuma; Toptas, Irem; Albayrak, Onder; Tanrikulu, Abdulkadir
    Wheat is an important food crop. Its production is limited by multiple environmental stresses, especially terminal heat stress. High temperature and drought are the main stresses affecting wheat production in the Mediterranean region. Hence, the chlorophyll content in leaves reflects photosynthetic activity and the yield potential of wheat plants. So, the aim of this study was to evaluate SPAD (Soil Plant Analysis Development) chlorophyll meter readings and their relationships with the grain yield of spring wheat growing in different environments, and to examine the physiological responses to environmental stress at different growth stages. Sixteen spring wheat genotypes were grown under two temperature (cool and warm) and two moisture (rain-fed and irrigated) regimes during the 2011/2012 growing season in two locations in Turkey (Adana and Diyarbakir). There were significant genotypic variations in SPAD values under all conditions. There was a significant positive correlation between third-leaf SPAD values and grain yield in the cool-climate conditions at Adana. There was a significant positive relationship between flag-leaf SPAD values at the heading stage and grain yield under cool-climate conditions in Diyarbakir, while the relationship between SPAD values and grain yield was negative under warm-environment conditions. The SPAD values were more strongly affected by location and heat stress than by drought stress. Regarding to the range of SPAD values within each genotype was relatively stable. Together, these results showed that SPAD values can be used as an indicator of grain yield in spring wheat, providing that the measurements are taken at appropriate stages at each location.