Ali Asghar Ghaderi; Barat Ali Fakheri; Nafiseh Mahdi Nezhad
Abstract
In order to investigate the effects of foliar application of ascorbic acid on the growth indexes and physiological traitsof thyme under drought stress, an experiment was conducted in the split plots based on randomized complete block design with three replications at the Research Farm, Faculty of Agriculture ...
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In order to investigate the effects of foliar application of ascorbic acid on the growth indexes and physiological traitsof thyme under drought stress, an experiment was conducted in the split plots based on randomized complete block design with three replications at the Research Farm, Faculty of Agriculture University of Zabol, Iran. The main factor was drought stress and applied based on the irrigation at 75, 55 and 35% FC and the subplot was foliar application with three levels including distilled water (control), 10 mM and 20 mM ascorbic acid. Main effects of drought stress and foliar application of ascorbic acid were significant (P≤0.01) for all studied traits. The interaction of water stress and foliar application of ascorbic acid was significant only for proline. Applying severe stress compared with control was decreased the total chlorophyll, carotenoid, root and shoot dry weight (29.0, 39.9, 50.5 and 43.0%, respectively), while the leaf proline and the root length were increased (44.2 and 26.6%, respectively). The foliar application of ascorbic acid (20 mM) significantly increased the amounts of photosynthetic pigments, shoot length, root and shoot weight. Simple correlation coefficients of the traits showed a significant and positive relationship between shoot dry weight and other traits, in drought stress and 20 mM foliar application of ascorbic acid conditions. Factor analysis was identified four factors for normal and four factors for severe stress conditions that at overall were explained 98 and 95% of total variation, respectively. In general, it was concluded that photosynthetic pigments and root-related traits would be the important yield related criteria (shoot dry weight), that can be beneficial in the development of thyme with higher performance under stress conditions.
FARIBA SAEDI; Said Mohsen Mosavi Nik; Abdoll Rahman Rahimian Boger
Abstract
In order to investigate effectsof different fertilizers on reduce negative effects of drought stress in chicory (Cichorium intybus L.), manure and poular fertilizers, Nano potassium and potassium sulfate were used on morphophysiological characteristics of chicory under drought stress. This experiment ...
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In order to investigate effectsof different fertilizers on reduce negative effects of drought stress in chicory (Cichorium intybus L.), manure and poular fertilizers, Nano potassium and potassium sulfate were used on morphophysiological characteristics of chicory under drought stress. This experiment was carried out in a factorial plot based with a randomized complete block design in three replications at the Agricultural Research farm of Zabol University in 2014-2015. Water stress treatments included 60, 90 and 120 mm water evaporation from evaporate pan class assigned to the first plots and different types of fertilizers included manure and poular fertilizers were applied at 30 ton/ha, and nano potassium (27percent) and potassium sulphat were applied 10 and 150 kg. Results showed that drought stresses were decreased the growth characteristics significantly, while application of different fertilizers were decreasing the negative effects of drought on growth characteristics, especially two organic fertilizers are effective on reduce the negative effects of drought. Also, the highest plant height, flower diameter, flower number, lateral branches, flower yield and shoot yield were obtained at manure fertilizer treatments. Strong stress was showed the lowest content of chlorophyll a and b significantly, but carotenoids and anthocyanin are increases. Application of manure fertilizer improve a / b chlorophylls, and carotenoids significantly under drought stress. So the highest anthocyanin obtained at Nano potassium treatment. Different fertilizer treatments have had significant effects on antioxidant enzymes activities in comparison with control treatment.