Browsing by Author "Shahsavar, Ali Reza"
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Item Comparative efficacy of citric acid and Fe(II) Sulfate in the prevention of chlorosis in orange trees (Citrus sinensis L. cv ‘Darabi’)(Uludağ Üniversitesi, 2009) Amri, Elias; Shahsavar, Ali RezaA field experiment was carried out comprising foliar spray of citricric acid and Fe(II) sulfate alone and in combination with citricric acid were applied to evaluate the recovery of iron chlorosis of orange trees (Citrus sinensis L. cv ‘Darabi’ , grafted on Citrus aurantifolia L.) grown on a calcareous soil. The treatments were Fe(II) sulfate (500 mg Fe/L), citric acids plus Fe(II) sulfate (1000 mg/L + 500 mg Fe/L), citric acid (1000 mg/L), and distilled water as a control. A non-ionic wetting agent was used in all treatments. The use of frequent foliar sprays alleviated Fe chlorosis in orange trees. On 4 of 7 measurement dates, trees in the citric acids plus Fe(II) sulfate treatment had higher leaf chlorophyll indexes determined with a SPAD meter (SPAD values) than trees in all other treatments. Trees in the Fe(II) Sulfate treatment had higher SPAD values than trees in the citric acids and control treatments. Total leaf iron content was higher for the citric acids plus Fe(II) sulfate and Fe(II) sulfate treatments than the citric acids and control treatments. There was a difference in total leaf iron content between the citric acids and control treatments. Sprays of citric acids plus Fe(II) sulfate improved fruit size and quality compared to fruits of control trees. Sprays of Fe(II) sulfate also improved fruit quality and increase fruit size. Sprays of citric acids also improved fruit size and quality compared to fruits of control trees. These results suggest that foliar sprays with Fe could help to avoid yield and quality losses caused by Fe chlorosis in citrus orchards. Furthermore, these treatments could be done with relatively cheap materials such as solutions containing Fe(II) sulfate.Item Endogenous promoters and ınhibitors in olive cuttings in relation to adventitious root formation(Uludağ Üniversitesi, 2010) Asl moshtaghi, Elham; Shahsavar, Ali RezaLevels of endogenous rooting promoters and inhibitors were determined in olive cvs "Roghani"(high rooting ability), "Tokhmkabki" and "Konservalia"(low rooting abilities). Cuttings were prepared and rooted in greenhouse under intermittent mist after that, samples for each cultivar were taken 60 days after cuttings preparation. Thin layer chromatography was used for purification and identification of endogenous plant hormones (Indol-3-acetic acid (IAA), Abscisic acid (ABA), Gibberellins (GAs) and cytokinins). Results indicated that "Roghani" olive cuttings gave significantly higher rooting percentage than "Tokhmkabki" and "Konservalia". Results showed significant differences in IAA concentration in leaves of "Roghani", "Tokhmkabki" and "Konservalia" at sampling date. IAA concentration in "Roghani" leaves was significantly higher than "Tokhmkabki" and "Konservalia" cultivars. These results suggest that auxin was confirmed as limiting factor of root initiation. However, insignificant differences in ABA and cytokinins concentration were recorded between the 3 olive cultivars. But the high GAs concentration in "Tokhmkabki" and "Konservalia" leaves coincides with the low rooting percentages of the cuttings.Item Endogenous soluble sugars, starch contents and phenolic compounds in easy - and difficult – to – root olive cuttings(Uludağ Üniversitesi, 2010) Aslmoshtaghi, Elham; Shahsavar, Ali RezaThis study was carried out to elucidate the relationship between the monthly changes of rooting ability and inner condition of cuttings, such as soluble sugars, starch contents and the total phenolic content in cuttings of olive, and to determine the great differences in the rooting potential of cultivars and clones within a species were shown in many cultivars of olives. Several factors, at biochemical and molecular levels, interact in the formation and development of adventitious roots. The formation of adventitious root is an essential process in propagation of olive tree. The ability of rooting is critical in several strongly recalcitrant olive cultivars. The availability and mobilization of carbohydrates towards the base of cuttings appear can be major factors related to rooting of olive cuttings. Although "Roghani" cuttings shows a maximum soluble sugars and starch contents at the beginning of the experiment. But a completely different situation was found 60 days later. Soluble sugars were higher in all of the cultivars in comparison with at the beginning of the experiment. There were significant differences between 3 cultivars in the total phenolic content and the highest phenolic compounds were found in "Konsrvalia" after 120 days and the lowest phenolic compounds were found in "Roghani" cultivar.