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Shahed University , paravar69@gmail.com
Abstract: (320 Views)
Extended abstract
Introduction: The longevity of seeds is a crucial aspect of seed quality and a significant concern for the seed industry. The lifespan of a seed, which can extend over several years or even decades, is essential for safeguarding the plant's genetic resources. Storage conditions, including seed moisture level, relative humidity, gases (such as oxygen, nitrogen, carbon dioxide), and temperature, are the primary factors that determine seed lifespan. Among these aging factors, oxygen in dry storage conditions has the most detrimental effect on seed germination, storage metabolic activities, and enzyme activity of dried seeds. Lalemantia iberica and Lallemantia royleana seeds contain high levels of fatty acids, especially linolenic acid (56-67%), which have significant beneficial effects on health. However, a large number of L. iberica and L. royleana seeds deteriorate due to inadequate storage conditions by most farmers. The aim of this study is to investigate the effects of different storage conditions, especially natural aging, controlled aging, aging with oxygen, and nitrogen on germination, chemical activities, metabolic reserves, and enzymatic activities of dry L. iberica and L. royleana seeds.
Materials and Methods: A completely randomized factorial design with four replications was implemented in the seed science laboratory at the Faculty of Agriculture, Shahid University in 2021. The experimental treatments included storage environments (control, natural aging, controlled aging, aging with oxygen and nitrogen pressure) and plant species (Lallemantia iberica and Lallemantia royleana).
Results: The results indicated that aging with oxygen had the most detrimental impact on the germination rate, seed germination, reservoirs content, and the activity of alpha and beta amylase enzymes, compared with controlled aging and natural aging. Conversely, the highest levels of electrical conductivity, hydrogen peroxide, lipid peroxidation, saturated and unsaturated fatty acids were observed in dry seeds stored under oxygen aging conditions. In comparison to artificial aging (controlled aging and oxygen aging), seeds stored under natural aging conditions exhibited the highest germination rate, storage compound content, and amylase enzyme activity. Throughout the storage process, it was observed that the deterioration rate was higher in the dry seeds of L. iberica compared with L. royleana.
Conclusions: Aging with oxygen can be regarded as a rapid artificial aging method for assessing the longevity of dry seeds. Conversely, the use of low temperature and humidity conditions in natural aging can be considered a practical method for preserving the quality and longevity of seeds. Due to their high content of storage compounds (sucrose, starch, and total sugar content), L. royleana seeds can be stored for extended periods.
Highlights:
Introduction: The longevity of seeds is a crucial aspect of seed quality and a significant concern for the seed industry. The lifespan of a seed, which can extend over several years or even decades, is essential for safeguarding the plant's genetic resources. Storage conditions, including seed moisture level, relative humidity, gases (such as oxygen, nitrogen, carbon dioxide), and temperature, are the primary factors that determine seed lifespan. Among these aging factors, oxygen in dry storage conditions has the most detrimental effect on seed germination, storage metabolic activities, and enzyme activity of dried seeds. Lalemantia iberica and Lallemantia royleana seeds contain high levels of fatty acids, especially linolenic acid (56-67%), which have significant beneficial effects on health. However, a large number of L. iberica and L. royleana seeds deteriorate due to inadequate storage conditions by most farmers. The aim of this study is to investigate the effects of different storage conditions, especially natural aging, controlled aging, aging with oxygen, and nitrogen on germination, chemical activities, metabolic reserves, and enzymatic activities of dry L. iberica and L. royleana seeds.
Materials and Methods: A completely randomized factorial design with four replications was implemented in the seed science laboratory at the Faculty of Agriculture, Shahid University in 2021. The experimental treatments included storage environments (control, natural aging, controlled aging, aging with oxygen and nitrogen pressure) and plant species (Lallemantia iberica and Lallemantia royleana).
Results: The results indicated that aging with oxygen had the most detrimental impact on the germination rate, seed germination, reservoirs content, and the activity of alpha and beta amylase enzymes, compared with controlled aging and natural aging. Conversely, the highest levels of electrical conductivity, hydrogen peroxide, lipid peroxidation, saturated and unsaturated fatty acids were observed in dry seeds stored under oxygen aging conditions. In comparison to artificial aging (controlled aging and oxygen aging), seeds stored under natural aging conditions exhibited the highest germination rate, storage compound content, and amylase enzyme activity. Throughout the storage process, it was observed that the deterioration rate was higher in the dry seeds of L. iberica compared with L. royleana.
Conclusions: Aging with oxygen can be regarded as a rapid artificial aging method for assessing the longevity of dry seeds. Conversely, the use of low temperature and humidity conditions in natural aging can be considered a practical method for preserving the quality and longevity of seeds. Due to their high content of storage compounds (sucrose, starch, and total sugar content), L. royleana seeds can be stored for extended periods.
Highlights:
- Seed aging led to an increase in biochemical indices such as lipid peroxidation, hydrogen peroxide, saturated and unsaturated fatty acids.
- The rate of deterioration in dry seeds of L. iberica was higher than L. royleana.
- The content of storage compounds and the activity of amylase enzymes were higher in L. royleana seeds compared to L. iberica.
Article number: 5
Type of Study: Research |
Subject:
Seed Physiology
Received: 2024/03/13 | Revised: 2024/09/29 | Accepted: 2024/08/3
Received: 2024/03/13 | Revised: 2024/09/29 | Accepted: 2024/08/3
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