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۱Effect of EDTA Application on Lead and Zinc Uptake and Germination of Thlaspi caerulescens L. in a Contaminated Soil
اطلاعات انتشار: ECOPERSIA، سوم،شماره۴، Autumn ۲۰۱۵، سال
تعداد صفحات: ۱۲
Pot experiment was carried out to investigate the effects of ethylenediaminetetraacetic acid (EDTA) on some morphological characteristics of Thlaspi caerulescens L., and also on the accumulation of lead (Pb) and zinc (Zn) in roots and shoots of T. caerulescens L.. Experiments were then set up in three treated pots with doses of 3, 6 and 9 mmol kg–1 of EDTA and control pots (C: uncontaminated soil and W: contaminated soil). The results indicated the significant effect of EDTA on morphological characteristics and accumulation of heavy metals in the plant (P0.05). Data revealed that the maximum of germination (99.11 and 96.00%), maximum of root length (73.31 and 70.14 mm) and maximum of shoot length (51.64 and 44.14 mm) and maximum of biomass weight (61.31 and 52.18 mg) were achieved by C treatment followed by W treatment. The maximum bioconcentration factor (3.57) and translocation factor (0.89) was observed on 9 mmol kg–1 EDTA. In addition, the effect of EDTA on Tolerance Index (TI) showed that the TI decreased with increasing doses of EDTA. The findings indicated that the study species tolerated heavy metals concentration. EDTA had potential to promote the uptake of heavy metals for T. caerulescens L., butwith respect to non–significant differences between 6 mmol kg–1 EDTA and 9 mmol kg–1 EDTA treatments. Thereore, low dose of EDTA suggested to be applied because of its environmental risk.

۲Effect of Humic Acid on Seed Germination and Seedling Growth of Borago officinalis and Cichorium intybus
نویسنده(ها): ،
اطلاعات انتشار: ECOPERSIA، چهارم،شماره۱، Winter ۲۰۱۶، سال
تعداد صفحات: ۱۱
The study was conducted to investigate the effect of humic acid on germination properties of medicinal plants Borago officinalis and Cichorium intybus in a completely randomized design with five replications. Experimental treatment comprised the following dosage 0, 15, 30 g l–1. Results revealed that effect of humic acid on germination properties of C. intybus was significant (p0.01) except for the germination percentage and mean germination time (p 0.01). In addition, results showed that humic acid was effective on morphological properties of C. intybus except for radical and pedicel dry weight. Impact of humic acid was effective on germination properties of B. officinalis except for the germination percentage (p1%) and was only effective on morphological properties viz. radical fresh weight, seedlings pedical length and allometric coefficient. The most effect was obtained in the 30 g l–1 humic acid.The control treatment had the least effect on the plant's properties. In conclusion, the results showed application of 30 g l–1 humic acid was effective in germination of the plant species and stimulated the plant germination.
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