فهرس المقالات Zinnia

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  1 - Salicylic Acid Alleviates the Copper Toxicity in Zinnia elegans
  Maryam Afrousheh Ali Tehranifar Mahmud Shoor Vahid Reza Safari
  Salicylic acid (SA) plays a key role in plant disease resistance and hyper-sensitive cell death but is also implicated in hardening responses to abiotic stress. The aim of this study is to examine the effects of salicylic acid on the growth, eco-physiological and bioche أکثر

  Salicylic acid (SA) plays a key role in plant disease resistance and hyper-sensitive cell death but is also implicated in hardening responses to abiotic stress. The aim of this study is to examine the effects of salicylic acid on the growth, eco-physiological and biochemical characteristics in Zinnia elegans plant exposed to copper stress. Effects of copper (Cu) on biomass, root length and shoot height and Cu uptake are also discussed. This experiment was arranged as a factorial experiment based on completely randomized design with four replications in greenhouse conditions. The experimental treatment consisted of four levels of Cu (0, 100, 200, and 400 mg/kg in potted soil) and three levels of salicylic acid (0, 1, 2 mM) as foliar spray and chelate to soil. Results showed that with increasing levels of copper, reductions in shoot and root growth, leaf area and leaf number were statistically significant (p<0.01). Analysis of some biochemical indices (chlorophyll content) and eco-physiological indices such as primary florescence chlorophyll (Fo), ratio of variable chlorophyll to maximum (Fv/Fm) in treated plants were statistically significant (p<0.01). The results showed that copper accumulation was higher in the roots than shoots. The Fluo-rescence measurements showed that primary florescence chlorophyll (Fo) was increased but maximum florescence chlorophyll (Fm) was decreased progressively with increasing Cu. Salicylic acid significantly increased root and shoot growth and chlorophyll content in copper stressed plants. SA applying as chelate 2 mM also showed an increased level of tolerance toward high Cu concentrations. The results support the conclusion that SA alleviates Cu toxicity. تفاصيل المقالة
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  2 - The Effect of Cycocel and Pot Size on Vegetative Growth and Flowering of Zinnia (<i>Zinnia elegans)
  Sadaf Taherpazir Davood Hashemabadi
  Zinnia is a very attractive and beautiful ornamental plant due to the diversity of color and flowering period. The effect of cycocel and pot size was studied on growth and flowering of zinnia in a factorial experiment based on a randomized complete design with two facto أکثر

  Zinnia is a very attractive and beautiful ornamental plant due to the diversity of color and flowering period. The effect of cycocel and pot size was studied on growth and flowering of zinnia in a factorial experiment based on a randomized complete design with two factors: cycocel at 3 levels (0, 1000 and 2000 ppm) and pot size at 4 levels (10, 12, 14 and 16 cm) with 12 treatments and 3 replications. The interaction results showed that cycocel and pot size had a significant effect on all studied traits, that 2000 ppm cycocel in 12 cm pots produced the minimum height and that 16 cm pots treated with 1000 ppm cycocel or without cycocel treatment produced the maximum plant height. Maximum flowering period was related to 14 cm pots &times; 1000 ppm cycocel that had no significant difference with plants in 16 cm pot size in all three concentrations of cycocel. Minimum flowering period was related to 10 cm pot size at all three concentrations of cycocel. Zinnias planted in 10 cm pot size without cycocel treatment exhibited the minimum fresh weight and in 14 cm pot size without cycocel treatment exhibited the maximum root fresh weight. Overall, flowers in 14 and 16 cm pot sizes treated with 1000 ppm cycocel were found to be the best treatments. تفاصيل المقالة
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  3 - The Effect of Silicon on the Growth Traits and Resistance of Zinnia (<i>Zinnia elegans</i> Jacq.) to Powdery Mildew Disease
  Seyyedeh Maryam Mirsafaye Moghaddam Mohammad Naghi Padasht Dahkaei
  To investigate the effects of silicon on the growth characteristics and the reduction of the powdery mildew damage to Zinnia (Zinnia elegans Jacq. ʻMagellanʼ), an experiment was carried out as a factorial experiment in the form of a randomized complete block design with أکثر

  To investigate the effects of silicon on the growth characteristics and the reduction of the powdery mildew damage to Zinnia (Zinnia elegans Jacq. ʻMagellanʼ), an experiment was carried out as a factorial experiment in the form of a randomized complete block design with two factors including eight treatments and three replications. The first factor included silicon concentrations at four levels (0, 50, 100, 150 mg L-1 Si) and the second factor consisted of the Si application methods (foliar spray and medium drenching). Depending on the concentration and method of silicon supplied, several horticultural traits were improved as a result of Si supplementation. Silicon content of Si-treated plants (100 and 150 mg L-1 Si foliar spray) significantly increased as compared with untreated controls. Disease severity of powdery mildew was reduced by sodium silicate. The results of our study demonstrated that foliar spray treatments were more effective in managing disease than drenches treatments. تفاصيل المقالة