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    Combining Ability and Line x Tester Analysis on Heat Tolerance in Cotton (Gossypium hirsutum L.)
    (Indian Journal Of Natural Sciences, 2016-02-20) Karademir, Emine; Karademir, Çetin; Başal, Hüseyin
    In recent years cotton breeders have started to interest more and more attention for improving high temperature tolerant cotton varieties due to increased global warming. For this purpose54 cross combinations (6x9) were created in 2010 and 54 F1 hybrid and their 15 parents, totally 69 genotypes were tested at the experimental area of GAP International Agricultural Research and Training Center in 2011. In the populations seed cotton yield, ginning percentage, fiber yield, photosynthetic yield, chlorophyll content and photosynthetically active radiation expressed non-additive gene action (dominant or epistatic) and GCA variance was higher than SCA variance only for fluorescence reflecting the role of additive type of gene action. It was determined that SJ-U86, AGC 375, Fiber Max 819, AGC 208 and STV 453 for seed cotton yield; Fiber Max 819 and Fiber Max 832 for ginning percentage; SJ-U86, DP 90, AGC 375, Fiber Max 819 and STV 453 for fiber yield; Fiber Max 832 and STV 453 for photosynthetic yield; AGC 375, SJ-U 86 and DP 396 for chlorophyll content; Fiber Max 819 and STV 474 for fluorescence; AGC 208 and DP 499 for photosynthetically active radiation (PAR) were the best parent cotton varieties and also having the best (GCA) general combining abilities. In the study specific combining ability (SCA) of hybrids were investigated and some promising cross combinations were selected and transferred to the next generation.
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    Correlations Between Canopy Temperature, Chlorophyll Content and Yield In Heat Tolerant Cotton (Gossypium hirsutum L.) Genotypes.
    (Fresenius Environmental Bulletin, 2018-04-26) Karademir, Emine; Karademir, Çetin; Sevilmiş, Uğur; Başal, Hüseyin
    The study aimed to determine relationships among canopy temperature, chlorophyll content, seed cotton yield and fiber quality properties and using these relationships to screen large material in cotton breeding program under field conditions for heat tolerance. In this study 140 lines and 5 control varieties (Stoneville 468, DP 499, SJ-U 86, AGC 85 and AGC 208) were used as plant material. Field experiment was conducted as augmented design with four blocks. Canopy temperature (CT) measured three times during cotton growing, pre-flowering peak flowering and post flowering, on the other hand chlorophyll content was measured in peak flowering stage. The results of this study indicated that seed cotton yield significantly correlated with canopy temperature and was not affected by crop stage development.
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    Screening cotton varieties (Gossypium hirsutum L.) for heat tolerance under field conditions
    (African Journal of Agricultural Research, 2012-12-13) Karademir, Emine; Karademir, Çetin; Ekinci, Remzi; Başbağ, Sema; Başal, Hüseyin
    Fifteen upland cotton Gossypium hirsutum L., were evaluated for heat tolerance based on agronomical and physiological characteristics under field conditions where temperature exceeded 40°C in July and August. Genotypes showed statistically significant differences for stomatal conductance, photosynthetic yield, fluorescence, photosynthetically active radiation (PAR), seed cotton yield, plant height, boll weight, seed cotton weight, number of seeds per boll and 100 seed weight. In the study, relative cell injury level (RCIL), ranged from 54.56 to 79.44% and stomatal conductance ranged from 264.86 to 570.50 mol m-2s-1. Associations between investigated traits indicated that there were some positive correlations. These data indicated that photosynthetic yield, fluorescence, chlorophyll content (SPAD value), cell membrane thermostability (CMT), plant height and number of bolls per plant can be used for improving seed cotton yield. However, among these measurements CMT, SPAD value and fluorescence were more practical in large breeding trials. The results showed that AGC 375 and AGC 208 cotton varieties had lower relative cell injury level (higher cell membrane thermostability) and higher seed cotton yield and photosynthetic yield than other investigated varieties.