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دراسات كيميائيه حيويه على نبات القطن تحت تأثير الجفاف
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Abstract: The results obtained can be summarized as follows:
1. Drought stress
a. Drought stress on cotton plants led to decreased pigments (Chl a, b, total Chl. and caroteinoids contents) in Giza 90 and Giza 92 cultivars by (27.58%, 18.83%, 23.73% and 24.05%) and (28.98%, 29.17%, 29.07% and 37.72%) respectively.
b. Drought conditions tended to decrease reducing (55.26% and 62.18%), non reducing (16.23% and 39.93%) and total soluble sugars (45% and 54.88%) in Giza 90 and Giza 92 cultivars respectively.
c. Water stress reduced total phenols content in Giza 90 and Giza 92 cultivars (13.67% and 24.34%), total free amino acids (30.96% and 40.06%), total soluble protein contents (54.54% and 62.46%) and catalase activity (66.45% and 20.26%) respectively.
d. Drought stress on cotton plants led to increased proline (311.83% and 630%), total antioxidant capacity (87.78% and 65.57%) and peroxidase activity (207.15% and 204.85%) in Giza 90 and Giza 92 cultivars respectively, while seed contents (oil, protein and nitrogen) were decreased as compared with control plants (turgid) by (20.56%, 29.52% and 47.12%) in Giza 90 cultivar and Giza 92 cultivar (20.14%, 21.01% and 37.39%) respectively.
e. Drought due to decrease growth characters as compared with control plants (turgid) in the two cultivars (Giza 90 and Giza 92) in the two seasons.
f. Seed cotton yield were decreased as a result to drought conditions in season 2010 (8.04% and 31.4%) and season 2011 (7.06% and 30.71%) Giza 90 and Giza 92 cultivars respectively.
2. Effect of sodium nitroprusside, putrescine and glycine betaine
a. Exogenous application of SNP, Put and GB with different concentrations on cotton plant under drought stress led to improve physiological, morphological and chemical constitution of cotton. So it can use them for cotton plant tolerance of drought stress. The best treatment was spraying cotton plants with GB (800 ppm) then Put (600 ppm) and SNP (0.05 mM) in the two cotton cultivars.
b. The most effective treatment was spraying Giza 90 and Giza 92 cultivars with GB (800 ppm) which increased pigments (chl. a, b, total chl. and caroteinoids) by (29.59%, 28.51%, 29.09% and 26.36%) and (14.25%, 23.15%, 18.64% and 30.43%) respectively, carbohydrates (reducing, non-reducing and total soluble sugars) by (66% 45.33% and 59.93%) and ( 63.57%, 41.39% 56.11%) respectively, total phenols (35.66% and 34.58%), proline (52.82% and 54.05%), total amino acids (29.46% and 38.33%), total soluble protein (15.2% and 28.72%), increasing activity of catalase (73.31% and 31.6%) and peroxidase (36.33% and 17.74%) and increase total antioxidant capacity (7.61% and 29.63%) in cotton leaves. Also, increased oil, protein and nitrogen contents by (14.37%, 18.94% and 20.36%) and (17.48%, 18.63% and 31.85%) in seeds of Giza 90 and Giza 92 cultivars respectively as compared with drought stress plants.
c. Exogenous application of GB on cotton plant improved growth characters in the two cotton cultivars in two experimental seasons as compared with drought stress plants.
d. Exogenous application of GB (800 ppm) increased seed cotton yield in the Giza 90 and Giza 92 cultivars in season 2010 (43.1% and 19.52%) and season 2011 (40.39% and 34.6%) respectively as compared with drought stress plants.
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| Publication year |
2013
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| Organization Name |
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| Country |
Egypt
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| Author(s) from ARC |
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| Publication Type |
Master Thesis
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