INFLUENCE OF BIOREGULATORS UNICONAZOLE AND COUMARIN ON SOME MORPHOLOGICAL, PHYSIOLOGICAL ASPECTS AND FIBER QUALITY OF corros PLANTS | ||||
| Journal of Plant Production | ||||
| Article 4, Volume 30, Issue 7, July 2005, Page 3683-3696 PDF (2.96 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2005.237411 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| M. A. Bekheta,; Amany A. Ramadan | ||||
| Botany Department, National Research Centre, Ookki, Egypt | ||||
| Abstract | ||||
| Two field experiments were carried out in two successive seasons (2001 and 2002) at the middle of Delta. EI-Mahalla El-Kobra region, Gharbia Governorate to study the physiological responses of cotton plants to bioregulators uniconazole at 20. 40 and 60 ppm or coumarin at 50, 100 and 200 ppm. This work aimed at studying the effect of these bioregulators on vegetative growth parameters, some biochemical constituents (e.g. endogenous hormones, photosynthetic pigments. oil and fatty acids composition of the produced seeds) and the reflection of all these physiological changes on the yield and fiber properties of colton (Gossyp < /em>ium barbadense, Cv. Giza 86) plants. The obtained results revealed that plant height. internode length and the number of internodes/ptant were significantly decreased mostly at all the used levels of bioregulators. Meanwhile, number of leaves/plant and the number of branches/plant were Significantly increased at 40 or 60 ppm of uniconazole and at 100 or 200 ppm of coumarin. Application of uniconazole at the rate of 40 or 60 ppm and coumarin at the rate of 100 or 200 ppm led to mostly significant increases in number of flowers/plant. number of bolls/plant, boll set1ing %, number of open bolls/plant. seed cotton yield/plant and seed cotton yield/(ed. Also. the fiber properties, e.g. uniformity, fiber length, fiber strength. elongation and micronaire reading of the produced cotton. were improved and increased mostly at all used leve's The application of bioregulators ill ali the used levels led to decreases in the content of endogenous hormones indole acetic acid (1M) and gibberellic acid (G~). but the endogenous content of scscisrc acid (ABA) was increased. While the photosynthetic pigments (chI. a. chi band carotenoids) were significantly increased mostly at all the used le;,els of unicooazole. Oil percentage and fatty acid comoos.uon of the produced seeds were improved mostly at all the used levels of uniconazole and coumarin | ||||
| Keywords | ||||
| uniconazole. coumarin; endogenous hormones; fatly acids. photosynthetic pigments; fiber properties. cotton | ||||
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