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Somayeh Rastegar, Mostafa Ahmadzadeh, Hojat Piroozy,
Volume 2, Issue 2 ((Autumn & Winter) 2016)

Allelopathic compounds display an important role in biodiversity, stability and ability of ecosystem production. An experiment was conducted to investigate the allelopathic effect of six species, Cordia myxa, Melia indica, Delonix regai, Terminalia catappa, Eucalyptus camadulensis, Ficus religiosa on germination and seedling growth of Calendula officinalis. An experiment was performed in a completely randomized design with three replications in the lab of the horticultural Hormozgan university during 2014. A completely randomized design with three replications was carried out in the laboratory. Results indicated that the percentage of germination, seed germination rate, plumule and radicle length, and seed vigor of Calendula officinalis significantly reduced under aqueous extract of all species. But, there was no significant difference between dry weights. Delonix regia extract ceased the seed germinates in both concentrations. After that Melia indica extract had a highly significant inhibitory effect on seed germination, plumule and radicle length when compared to control. The results of this experiment also showed that the inhibitory effects of Cordia myxa and Terminalia catappa were lower in compared to other species. Between two concentrations, 100% concentration has a more inhibitory effect. The results of the present study revealed that inhibition of germination and growth parameters of Calendula officinalis showed variation according to the different plants. Cultivation of Calendula officinalis with Melia indica, Delonix regia species don’t suggest in the landscape.

Somayeh Rastegar, Akbar Peikari,
Volume 3, Issue 1 ((Spring and Summer) 2016)

In order to study the salt tolerance of three species, Coreopsis grandiflora, Celosia cristata and Matthiola incana in germination stage, an experiment was carried out based on a completely randomized design with three replications in Hormozgan University laboratory in 2015. Salinity levels, including 3, 6, 9, and 12 dS/m were applied by dilution seawater and distilled water used as a control. In this research, some seed germination indices such as germination percentage, germination rate and mean germination time, length, fresh and dry weight of seedling, seed vigor germination, were measured. Germination percentage, germination rate, seed vigor and dry weight of Coreopsis grandiflora seedling, were significantly different compared with control. In Celosia cristata, germination percent, seed vigor germination and seedling length didn’t show a significant difference in 9 dS/m salinity. In more characters, significant increases were seen with increasing salinity (9 dS/m). Germination percentage was decreased in comparisons with control (24.6%). In addition, the fresh and dry weight of seedling didn’t show a significant difference. The effect of salinity on seed germination of Matthiola incana in a different level of salinity was not significant. Although seed germination decreases gradually by salinity. In general, according to the observed results, Coreopsis grandiflora and Celosia cristata showed more tolerance to salt in comparison with Matthiola incana.

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