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    Determination the effect of defoliation timing on cotton yield and quality
    (Journal of central european agriculture, 2007-10-01) Karademir, Emine; Karademir, Çetin; Başbağ, Sema
    This study was carried out for determining the effect of different application times at 40, 50, 60 and 70 % boll opening and untreated plot of the defoliant on cotton yield, earliness and technological properties in Southeast Anatolia Region conditions in Turkey. Maras 92 cotton variety was used as plant material in the experiment field of the Southeast Anatolia Agricultural Research Institute during 2000-2001. Defoliant was including thidiazuron + diuron chemical substance. The result of this study showed that ginning percentage, 100 seed weight, seed germination percentage, fiber fineness, fiber length, fiber strength, reflectance, elongation and seed cotton yield were not affected by the treatment; plant height and first picking percentage in 2001, fiber uniformity in 2000 were 5 % significantly affected. This study showed that application of defoliant didn’t affect significantly yield and technological properties of cotton and after 40 % boll opening the defoliant can be used.
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    THE EFFECTS OF HIGH TEMPERATURE STRESS ON SOME AGRONOMIC CHARACTERS IN COTTON
    (Pakistan Journal of Botany, 2017-04-04) Ekinci, Remzi; Başbağ, Sema; Karademir, Emine; Karademir, Çetin
    High temperature is one of the abiotic stress causing morphological, physiological, biochemical and molecular changes on plant growth and productivity. One hundred and sixty cotton genotypes obtained from genetic stocks was evaluated for high temperature tolerance based on some agronomic characters under field and controlled conditions. Genotypes showed differences for all investigated characters. Plant height, node number and HNR ranged from 68.38-136.45 cm, 18.22-30.10 number.plant-1, 2.89-6.31 (HNR) respectively. Maximum and minimum values in terms of number of sympodial branches, boll abscission at first position, number of seed and seed-cotton yield changed from 11.09-24.42 number.plant-1; 4.17%-20.80%; 20.39-44.11 number.boll-1 and 5.74-60.30 gr.plant-1 respectively. Differences among genotypes were statistically significant for all characters under high temperature stress conditions. High temperature stress was declined the cotton plant development, the decline are important for cotton breeders and cotton breeding programs on the genotypes less affected from high temperature.
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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.
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    Screening for high-temperature tolerent cotton (Gossypium Spp.) by using some physio-morphological leaf treats
    (Fresenius Environmental Bulletin, 2017-12-03) Ekinci, Remzi; Başbağ, Sema; Karademir, Emine; Karademir, Çetin
    One hundred sixty cotton genotypes obtained from genetic stocks were evaluated for high temper- ature tolerance based on some physio-morphological leaf traits under field conditions and controlled con- dition. Genotypes showed differences for all investi- gated traits. In the study, stomal density ranged from 83.49-128.35 stomata. (mm2)-1, stomatal conduct- ance ranged from 140.77-394.90 mmol.m-2.s-1, sto- mal width ranged from 92.39-154.01 µm, stomatal rate of width/length ranged from 0.42-0.58, canopy temperature ranged from 20.24-52.00 oC, leaf area ranged from 67.50-173.05 cm2, leaf SPAD value ranged from 31.80-63.73, and leaf photosynthesis yield ranged from 12.72-33.05 µmol.m-2s-1. The re- sults showed that high temperature stress did not in- fluence stoma numbers, whereas it decreased sto- matal conductance, stomatal width, stomatal width/length, leaf area, leaf SPAD and leaf photo- synthesis yield; and that it increased canopy temper- ature values. The Fantom was determined to be tol- erant with respect to stomatal conductance trait and the Tropikal-225 genotype with respect to stoma width and width/length traits.