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Amin Abbasi, Fariborz Shekari, Seyed Bahman Mousavi, Naser Sabaghnia, Abdollah Javanmard,
Volume 3, Issue 2 (3-2017)
Abstract

The percentage and rate of germination and proper establishment of seedlings are important factors contributing to higher yield per unit area. As an essential element for plant growth and development, Zinc plays a critical role in many metabolic processes, and also has a positive effect on seed germination. The effects of seed priming with concentrations of 0.5, 1 and 2 percent zinc sulfate on the partitioning of reserved materials in seed, the start of autotrophic seedling growth and the activity of alpha-amylase enzyme were investigated in wheat seeds, using a factorial experiment in the Research Farm of the University of Maragheh, Iran in 2014 on the basis of a completely randomized design with four replications. The results showed that zinc priming had a significant effect on all the parameters under investigation. Mean comparisons showed that an increase in zinc concentration- up to one percent- had a positive effect on the parameters investigated and increasing its concentration more than one percent caused a negative effect on the parameters touched upon above. The results of this study showed that the dry seed weight of the control and zinc sulfate (0.5%) treatment reached a stable level on day 21 and 20, respectively. In addition, in the control and 0.5% zinc sulfate, the total dry weight reached its initial weight (seed weight) on day 15 and 13, respectively. In addition, the growth of autotrophic plant began 10-12 days after soaking. The seeds treated with 5.0 and 1 percent zinc sulfate had more leaf area than the other treatments; this could be due to the earlier entrance of the seedlings produced by 5.0 and 1% zinc sulfate treatments into the autotrophic stage, as compared with other treatments. The results of variance analysis of the finishing seeds' reserved materials, initial kernel, root dry weight and shoot dry weight confirmed that 0.5 and 1% zinc sulfate treatments were better than other concentrations. The treatments of 0.5 and 1%  of zinc sulfate reached the autotrophic stage sooner than the control and 2% zinc sulfate treatment. Given the results of this study, 5.0 and 1% zinc sulfate treatments were selected for field cultivation.
 


Zahra Mohammadzadeh Nasrabad Olya, Ahmad Mohtadi,
Volume 4, Issue 1 (9-2017)
Abstract

Weeds pose a serious threat to farmers. Using allopathic properties of the plants, especially those of the medicinal plants, has an important role in controlling weeds. This study was conducted to examine the allelopathic potential of Achillea wilhelmsii in germination of Hirshfeldia incana and Hordeum glaucum. A factorial experiment was conducted, adopting a completely randomized design with three replicates in both libratory and pot cultivation. Organ extracts (flower, leaf and root) of Achillea wilhelmsii in four concentrations were used, namely: 1, 2 and 5%. In addition, distilled water was used as a control. The result showed that the greatest percentages of the germination of Hordeum glaucum and Hirshfeldia incana were in the distilled water, which were 100 and 91%, respectively and that their germination reached zero percent under extraction of leaf and flower with a concentration of 5%. The concentration higher than 2% of the extraction of Achillea wilhelmsii significantly decreased germination, length of radicle and aerial part, fresh and dry weight of shoot and root, leaf area index and amount of chlorophyll in Hordeum glaucum and Hirshfeldia incana, in contrast with distilled water. The results showed that leaf and flower extraction of Achillea wilhelmsii had allopathic effects. In addition, it had impacts on germination and growth of the seeds of Hordeum glaucum and Hirshfeldia incana, which could be used in the production of natural herbicides.

Highlights:
  1.  Aqueous extrac of Achillea wilhelmsii significantly decreases germination and growth of Hordeum glaucum and Hirshfeldia incana.
  2. Aqueous extrac of Achillea wilhelmsii can be used to produce the natural herbicides.


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