Effect Of Different Zinc Levels Research Articles

Effects of zinc levels on synthesis and translocation of 13C-photoassimilates in leaves to fruit of apple during fruit expanding stage

To explore the effects of zinc levels on the synthesis and translocation of photosynthetic products from leaves to fruits, and to lay a theoretical foundation for improving fruit quality through zinc supplementation during the critical period of apple fruit development, a field experiment was carried out with a eight-year old 'Hanfu'/GM256/Malus baccata Borkh apple. We used the 13C tracer method to examine the effects of different zinc levels (ZnSO4·H2O 0, 0.1%, 0.2%, 0.3%, 0.4%, expressed by CK, Zn1, Zn2, Zn3, Zn4, respectively) on translocation of photosynthate to fruit during the stage of fruit expanding. The results showed that, with increasing zinc concentration, Rubisco enzyme activity, net photosynthetic rate, sorbitol and sucrose content, sorbitol 6-phosphate dehydrogenase, and sucrose phosphate synthase enzyme activities of leaves first increased and then decreased, with the highest values being observed in Zn3 treatment. Zn3 treatment significantly increased the 13C assimilation capability of leaves. Compared with other treatments, the 13C of self-retention (labeled leaves and labeled branches) was lowest in Zn3 treatment (61.2%) and the output of 13C photoassimilates was highest in Zn3 treatment (38.8%). 13C absorption of apple fruit showed a trend of Zn3 ＞ Zn2 ＞ Zn4 ＞ Zn1 ＞ CK. In summary, foliar zinc application under appropriate concentration (0.3% ZnSO4·H2O) enhanced photosynthesis, increased the assimilation capability of leaves, and promoted the directional transportation of photosynthate to fruit.

Effects of different zinc levels on grain yield and some phenological characteristics of red lentil (Lensculinaris Medic.) under arid conditions

This research aimed to determine the effects of different zinc (Zn) levels on the grain yield and some phenological characteristics of the Firat-87 red lentil variety (Lens culinaris Medic.). The study was conducted during the winter months of 2013-2014 and 2014- 2015 in Zn-deficit areas of Sanliurfa, Turkey. The experimental design was a randomized complete block design with 4 replicates. The Firat-87 lentil variety and Zn sulfate (ZnSO4.7H2O) were used as the plant material and Zn source, respectively. The Zn levels used were the control (0 kg ha-1 Zn), 5 kg ha-1 Zn, 10 kg ha-1 Zn, 15 kg ha-1 Zn, 20 kg ha-1 Zn, and 25 kg ha-1 Zn. The Zn levels were significant (P ≤ 0.01) for the harvest index, 1000-kernel weight, protein rate, and grain yield. All of the tested characteristics were positively affected by increasing applications of Zn. The grain, leaf, and soil Zn contents were higher with increasing levels of Zn. Although the highest grain yield was 15 kg ha-1 Zn in both years, according to the regression analysis, the optimum Zn level was 17 kg ha-1 Zn. However, the economic Zn level was determined as 15 kg ha-1 Zn.

Effects of Different Zinc Levels on Vegetative Growth and Essential Oil Contents of some Iranian and Turkish Cumin (Cumin cyminum L.) Genotypes

Cumin (Cuminum cyminum L.), originated from East Mediterranean country of Egypt, is widely cultivated in Middle Eastern, Asia minor and South East Asian countries. Zn is an essential factor in tryptophan metabolism and affects auxin contents in plants. In order to evaluate effects of Zn on vegetative growth, grain yield and its components on cumin genotypes, a field experiment was carried out at the department of field crops Ankara University; Turkey using randomized complete blocks split plot design with four replications during 2011 growing season. Four amounts of Zn (0, 1.5, 3 and 4.5 kg ha-1) in the form of soil application, were allocated at main plots and six genotypes [Kashmar, Bardskan, Mashhad (Iranian-origin)], [Haymana, Turkman and Egebin, (Turkish-origin)] were assigned to sub plots. Analysis of variance results showed significant interaction of zinc levels and genotypes for traits like root heights, grain yield, total dry matter, number of branches per plant and grain essential oil (p<0.01). Applications of different Zn levels was better than control in grain yield and its components. The highest amount of grain yield and essential oil (3.64%) was recorded using 3kg ha-1 Zn application. Grain yield had significant and positive correlation with plant height (r=0.95**) and root length (r=0.95**). Root length (3.59) and total dry maater (2.71), had the most positive direct effects and incontrast plant height (-1.63), number of branches per plant (-2.33) had negative direct effect on grain yield. At the regression model based on grain yield as a dependent variable, traits of plant height, root length, total dry matter, number of branches per plant and oil yield remained at the final model. Concerning essential oil constituents, β-terpinene was the major compound followed by p-cymene and β-pinene. Highest γ-terpinene content (49.14%) was recorded in Kashmar genotype using 3 kg ha-1 Zn.

Effects of different levels and sources of zinc on dry matter production and nutrient uptake by cotton (Gossypium hirsutum L.) in salt affected soil

The present study was aimed to study the effects of different zinc levels and sources on nutrient availability of cotton in saline sodic soil. A pot experiment was conducted in Factorial Completely Randomized Design with three replications. The treatments consisted of three different sources of zinc namely zinc sulphate, zinc –EDTA and zinc humate and four levels of Zn (0, 1.25, 2.5 and 5.0 mg kg). Cotton variety MCU-7 was grown as test crop. The dry matter production (DMP) and Zn uptake at different stages of crop growth were recorded in each pot separately. The uptake of NPK was recorded at harvest. The results of the study indicated that soil application of Zn significantly increased the dry matter production of the cotton invariably at all stages of crop growth. Among the three sources, Zn-humate recorded the highest DMP when compared with other two sources. Increasing the levels of Zn (0 to 5.0 mg kg) significantly increased the uptake of nitrogen, potassium and Zn. But phosphorus uptake by cotton was increased upto 2.5 mg kg of Zn. Beyond that level, significant reduction in phosphorus uptake was observed. The present study concluded that 2.5 mg kgof Zn through zinc humate is the optimum dose for highest dry matter production and maximum NPK and Zn uptake.

Effect of different zinc levels on activity of superoxide dismutases & acid phosphatases and organic acid exudation on wheat genotypes.

A field study was carried out to investigate the effect of three Zn levels 0, 20kg ZnSO4 ha(-1) and 20kg ZnSO4 ha(-1)+ foliar spray of 0.5% ZnSO4 on superoxide dismutase activity, acid phosphatase activity and grain yield and a pot experiment to study the effect of zinc deficient and sufficient conditions on organic acid exudation. Increasing Zn levels was established as beneficial in improving the enzyme activities of genotypes. Combined foliar and soil application of Zn proved to be superior of all the treatments. Zinc application resulted in a maximum increment limit of 96.8% in superoxide dismutase activity, 75.76% in acid phosphatase activity, and a decrement limit of 88.57% in oxalic acid exudation irrespective of stages and year of study. The increased enzyme activities had a positive impact on grain yield. As an average of all genotypes an improvement of 19.88% in 2009 and 21.29% in 2010 due to soil application while of 16.45% in 2009 and 13.01% in 2010 due to combined application was calculated for grain yield. There existed a variation among genotypes in showing responses towards zinc application and the genotypes UP 2584 and PBW 550 were found to be more responsive.

Effects of different Zinc levels in the sperm culture medium on sperm recovery and quality of sperms in the swim up procedure for sperm processing

A controlled ill vitro study was carried out to observe the effect of different Zinc (Zn) levels on sperm recovery rate, chromosome integrity, cell membrane integrity and motility in the swim up procedure. Semen samples were obtained from males who underwent seminal fluid analysis at the Infertility Laboratory, Department of Obstetrics and Gynaecology, Faculty of Medicine, Ragama. Twenty normozoo­ spermic samples were randomly selected for the study and each sample was processed with supplemented Earl's Balanced Salt Solution (EBSS) containing different concentrations of Zn [0.5ml of supplemented EBSS with 251'1 of solution containing 0.61'mol (group 1) and 1.2 I'mol (group 2) of Zn respectively]. One aliquot processed with 25 1'1 of physiological saline with added EBSS served as the control. Pre and post wash sperm counts and motility were recorded immediately after processing. Post wash sperms from the three groups were observed for chromosome integrity, cell membrane integrity, and motility. Motility changes after four hours of incubation were also observed. The mean sperm concentration showed an increase in group 1 compared to the control sample [21.87 ± 21.61 (SO) millions / ml compared to 18.34 ± 19.73 millions / ml, P 0.05]. The mean differences in sperm concentration compared to the control showed statistically Significant differences in both groups where an increase was observed in group 1 [3.52 ± 4.96 (SO) millions / ml] and a reduction in group 2 (- 2.08 ± 6.59 millions/ ml).

The effect of different zinc levels on the growth of grapevines

Abstract The effect of different zinc levels on the vegetative growth, photosynthetic activity, and Zn content of water‐cultured Muscat d'Alexandrie, grafted onto 110 Richter and 140 Ruggeri, was investigated under greenhouse conditions. Typical Zn deficiency symptoms, such as small leaves and disturbed apical dominance occurred at low Zn concentrations. An increase in Zn concentration resulted in slight increases in fresh and dry mass. With rootstock 140 Ruggeri average leaf area and internode length seemed to increase with an increase in Zn concentration. The photosynthetic activity generally increased with an increase in Zn concentration.