Volume 6, Issue 1 ((Spring and Summer) 2019)                   Iranian J. Seed Res. 2019, 6(1): 19-32 | Back to browse issues page

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Nazer M, Ehteshami S M, Salehi M, Kafighasemi A. Quantification of the Best Harvest Time of Guar (Cyamopsis tetragonoloba) Seed with High Quality in Golestan Province. Iranian J. Seed Res.. 2019; 6 (1) :19-32
URL: http://yujs.yu.ac.ir/jisr/article-1-359-en.html
University of Guilan , smrehteshami@yahoo.com
Abstract:   (61 Views)
DOR: 98.1000/2383-1251.1398.6. 19.11.1. 1603.1606

Extended Abstract
Introduction: Guar (Cyamopsis tetragonolob) which belongs to fabaceae and leguminosae families is self-pollinating and is indigenous to India and Pakistan. This plant is suitable for growth in dry, damp and sandy soils, and can tolerate saline and relatively alkaline soils. Determining the best time for harvesting seeds and its timing with maximum quality is one of the important issues in the field of seed production management. The changes in the physiological quality of seeds occur during development until seed treatment. The use of high-quality seeds plays an important role in the final yield of crops. The purpose of this study was to determine the most suitable time for harvesting seeds because seed moisture content at harvest time is one of the most important factors affecting seed quality.
Materials and Methods: This research was carried out in July 2013 at Iraqi Research Station in Gorgan, Golestan, Iran in a split-plot design with four replications. The treatments consisted of the time of harvesting the seeds from the mother's base in six stages (with different moisture content) and harvesting places (upper, middle, and bottom pods) so that, starting from the podding, every 7 days, the seeds were removed from the base. The mother was harvested and such traits as germination rate, germination percentage, seedling vigor, seed moisture content, and alpha-amylase activity were calculated. In this research, a logistic model was used to study the changes in germination percentage, germination rate, seedling vigor index and straw index during seed dressing on Guar.
Results: The results of this study showed that the hypothesis that seed reaches its maximum quality at the end of the period of seed filling is confirmed, suggesting that with a moisture content of 30 and 14% in late seed filling period, Guar seeds have the highest quality. In general, the results of the present study confirm that the stages of development and management of Guar seeds on maternal basis have an impact on its quality. In the early stages of growth (humidity 85, 80 and 62 percent), due to prematurity and lack of essential seed structures, the qualitative traits of germination percentage, germination rate, seedling vigor, and strawberry index were low, and with the evolution of essential structures and reduced seed moisture content (58, 30 and 14%), the quality traits increased.
Conclusions: In general, it can be concluded that the best timing for harvesting Guar seeds with the highest quality in Golestan province is when seed moisture reaches 14% or 100 days after planting, and the pods formed at the bottom are the ones with the highest quality.
  1. To investigate the qualitative indices of Guar seed on the mother plant during seed filling period
  2. To determine the best harvest time and its adaptation with the highest quality of Guar seed
Full-Text [PDF 452 kb]   (12 Downloads)    
Type of Study: Research | Subject: Seed Physiology
Received: 2018/07/4 | Accepted: 2018/11/24

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