Volume 5, Issue 1 ((Spring and Summer) 2018)                   Iranian J. Seed Res. 2018, 5(1): 87-100 | Back to browse issues page


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Kiani J, Abbasi Surki A, Danesh Shahraki A. Effects of Seed Pretreatments on Seed Germination Characteristics of Sugar Beet (Beta vulgaris) under Drought Stress Conditions. Iranian J. Seed Res.. 2018; 5 (1) :87-100
URL: http://yujs.yu.ac.ir/jisr/article-1-199-en.html
College of Agriculture, Shahrekord University , aabasi59@yahoo.com
Abstract:   (4898 Views)
DOR: 98.1000/2383-1251.1397.5.87.9.1.1578.1610

Extended abstract
Introduction: Drought stress is one of the major problems in sugar beet production in Iran, and is the most important limiting factor for germination and establishment of sugar beet in the early stages of growth. Seed priming with chemical, nutrient elements or pre-chilling techniques are the most effective methods to improve germination percentage and speed, leading to uniform and tolerant seedlings in adverse environmental conditions.
Material and Methods:  In order to assess the effect of cold stratification and HCl treatments on the germination of sugar beet seed, cv. Ekbatan, under drought stress conditions, a RCBD factorial experiment with three replications was conducted in Seed Science and Technology Lab of Shahrekord University.  The first factor was stratification in two levels; the second factor was  seven levels of pretreatments including 2, 4 and 6 hours’ soaking in water and 0.03 HCL accompanied with control, and the third factor was four drought levels (control, -2, -4, -6 bar).
Result: Compared with the control, seed germination percentage and germination rate increased by at least 5-fold, relative germination by 50% and root and shoot length by 10%, due to stratification and duration of exposure to HCl treatments. With no stratification, germination traits increased with increases in exposure time in acid, and the highest values were obtained for the seeds exposed to HCl 0.03 normal for 6 hours. Although under optimal conditions, the effect of HCl was compensated for by stratification, in drought conditions, the highest values ​​were observed in stratified seeds and those placed in acid.
Conclusions: Since successful establishment of sugar beet seedlings at drought stress conditions is critical to achieving optimum density and yield, application of stratification treatments for one week and seed exposure to HCl increased the seed performance under stress conditions. This trend continued to increase with drought stress intensity, and placement of seeds in acid doubled seed germination in -2 bar drought conditions, which continued by 4 times in -6 bar, compared with stratified control seeds. Compared to separate application of the treatments, application of stratification and HCl treatments had synergistic effects on sugar beet seed performance, especially under drought stress conditions.
 
 
Highlights:
  1. Cold stratification and hydrochloric acid treatments increase the efficiency of sugar beet seeds under drought stress conditions.
  2. Cold stratification and Hydrochloric acid treatment have a synergistic effect on sugar beet seeds.

Keywords: Germination percentage, Hydrochloric acid, Stratification, Sugar beet
DOR: 98.1000/2383-1251.1397.5.87.9.1.1578.1610
Full-Text [PDF 978 kb]   (948 Downloads)    
Type of Study: Research | Subject: Seed Ecology
Received: 2018/02/7 | Accepted: 2018/07/12

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