Search published articles


Showing 3 results for Seedling Weight
The Effect of Seed Pod Removal on Salinity Tolerance of Annual Medic (Medicago scutellata) at the Germination Stage
Farzaneh Fakhari, Hossein Sadeghi,
Volume 3, Issue 1 (8-2016)
Abstract

There have been a few studies on removing the seed pods in annual medics, despite its importance. To investigate the role of pod removal on seed germination, seedling growth and antioxidant enzyme activities in annual medic (Medicago scutellata L.) Under salt stress, a factorial experiment was conducted based on a completely randomized design with four replications in 2014. Salinity at 5 levels: 0.62 (tap water as a control), 3, 6, 9 and 12 dS m-1 was applied using sodium chloride. The results showed that salt stress caused changes in the characteristics of germination, seedling growth and antioxidant enzyme activities. With increasing in salinity levels, rate and percentage of germination as well as root length, shoot length and seedling weight was significantly decreased. However, increasing salinity levels increased the activity of antioxidant enzymes. Germination and growth in seed without pod was greater than those in seeds with pod; however, there were no significant differences between antioxidant enzyme activity; except about ascorbic peroxide that was significantly higher in seed without a pod. In general, salinity reduced germination and growth and increased antioxidant enzyme activity of annual medics. The results showed that planting seeds without pod had advantages for better germination and growth, especially under saline conditions.


Effect of Salt and Drought Stresses on Germination, Seedling Growth and Cell Membrane Stability of Anise (Pimpinella anisum) and Fennel (Foeniculum vulgare)
Roozbeh Farhoudi, Zahra Khodarahmpour,
Volume 4, Issue 1 (9-2017)
Abstract
The present study was conducted to evaluate the impact of drought and salinity stresses on germination, seedling growth and cell membrane stability of anise (Pimpinella anisum) and fennel (Foeniculum vulgare) in two separate experiments, using a completely randomized design with three replications in Islamic Azad University, Shoushtar Branch in 2013. Drought stress was applied by PEG 6000 and included 0, -2, -4, -6 and -8 bar and salinity treatments were 0, 40, 80 and 120 mM NaCl solutions. Salt and drought stresses significantly reduced germination percentage and seedling fresh weight of anise and fennel, but increased mean germination time and seedling electrical leakage. The results showed that the highest salinity and drought stresses levels increased seedling electrical leakage of anise by 83% and 76% compared with the control conditions. Moreover, seedling electrical leakage of fennel increased up to 77% and 75%, as compared with the control. The results showed that at germination stage, salt and drought stresses increased cell membrane damage, but decreased anise and fennel seedling growth.

Highlight:
  1.  Variations in concentration and the rate of destruction of seedling membranes of anise and fennel plants were studied in response to environmental stresses.
  2. The germination characteristics of anise and fennel were studied under salt and drought stresses.

Effect of Different Levels of Temperature and Drought Stress on Germination Characteristics of Roman Nettle (Urtica pilulifera)
Zakia Ibrahim Quchi, Gholamreza Mohsenabadi , Hamed Hassanpour ,
Volume 4, Issue 2 (3-2018)
Abstract

In order to investigate the effect of different levels of temperature and drought stress on seed germination parameters of nettle roman (Urtica pilulifera L.), an experiment was conducted as factorial in a completely randomized design with three replications at the Department of Agronomy, College of Agriculture, University of Guilan, in 2014. Treatments included different temperature levels (5, 10, 15, 20 and 25 °C) and drought stress levels (0 (control), -2, -4,-6 and -8 bars). The results showed that treatments and their interactions had a significant effect on germination percentage (GP), germination rate (GR), root length and root dry weight. The highest GP (88%), GR (1.8 seed/day) and root dry weight (0.06 g) were obtained as the result of the interaction between the temperature of 25°C and no-stress condition. In this study, with an increase in drought stress and a decrease in temperature, GP, GR, root dry weight, root length and shoot length decreased. The impact of drought stress on GR and GP was lower at 20°C, compared with the temperature of 25°C. A decrease in water potential from -4 to -6 bars at 20°C caused a reduction of 50% and 30% in GP and GR, respectively. However, these reductions at 25°C were 75% and 70%, respectively. According to the results, it could be stated that the significant reduction threshold of seed germination parameters was -2 bars.

 
Highlights:

  1. The germination characteristics of Roman nettle were studied under drought stress and temperature.
  2. In drought stress of -4 bars, germination percentage and germination rate decreased significantly.

Page 1 from 1     

© 2024 CC BY-NC 4.0 | Iranian Journal of Seed Research

Designed & Developed by : Yektaweb


This work is licensed under a Creative Commons Attribution 4.0 International License.