Volume 8, Issue 2 ((Autumn & Winter) 2022)
Iranian J. Seed Res. 2022, 8(2): 21-40 |
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latifzadeh Shahkhali M, Ehtehsami S M R, Moradi F. (2022). Investigating the Effects of Natural and Artificial Seed Deterioration on Reactive Oxygen Species, Antioxidant Enzymes, and Seed Germination Characteristics in Local and Improved Rice (Oryza sativa) Cultivars Derived from the Farms in Guilan Province. Iranian J. Seed Res.. 8(2), : 2 doi:10.52547/yujs.8.2.21
URL: http://yujs.yu.ac.ir/jisr/article-1-494-en.html
URL: http://yujs.yu.ac.ir/jisr/article-1-494-en.html
Associated Professor, Department of Agronomy and Plant Breeding, Faculty of Agriculture, University of Guilan, Guilan, Iran , smrehteshami@yahoo.com
Abstract: (3372 Views)
Extended abstract
Introduction: Seed deterioration is associated with oxidative stress and uncontrolled accumulation of reactive oxygen species. Seeds have a group of enzymatic and non-enzymatic antioxidants that protect them against reactive oxygen species and help maintain seed vigor and support seed germination processes. The response of different cultivars to seed deterioration is different. Knowledge about the sources and mechanisms of deterioration and how different cultivars respond can help to select the appropriate cultivar for the region and also provide useful information in selecting and applying appropriate management methods for storage and increasing the storage time of seeds.
Materials and Methods: The Experiment was conducted as factorial based on a completely randomized block design with three replications. Treatments included one and six months of natural storage (4˚C, 11 percent moisture content of seeds and 60% RH) and accelerated aging (96 hours at 45˚C and 100% RH) applied on four cultivars including Hashemi, Gilaneh, Khazar and Domsiyah. Germination percentage, germination rate, shoot length, radicle length, shoot dry weight, radicle dry weight, shoot vigor index (SVI), α-amylase activity, catalase (CAT), peroxidase (POX), superoxide dismutase (SOD) activity, malondialdehyde (MDA) and hydrogen peroxide (H2O2) content were evaluated.
Results: The results showed that accelerated ageing and storage of seeds for six months led to reduced germination percentage, germination rate, shoot length, radicle length, shoot dry weight, radicle dry weight, shoot vigor index (SVI), α-amylase activity reduced in all four cultivars. This decrease was accompanied by an increase in the free radical content of MDA and H2O2 and a decrease in the activity of the antioxidant enzymes SOD and POX. Malondialdehyde content was lower in the seeds stored for six months. The activity of CAT increased after deterioration treatment, this increase was more intense in the seeds stored for six months. These seeds also showed lower H2O2 content compared to accelerated aging seeds. Khazar cultivar showed lower H2O2 content as a result of higher CAT enzyme activity. Moreover, this cultivar showed better germination percentage and germination rate after deterioration treatment compared to other cultivars. The decrease in germination percentage due to deterioration in Domsiyah was very severe. This cultivar showed the lowest germination percentage, germination rate, seed vigor and α-amylase activity in the accelerated aging treatment. Gilaneh and Hashemi cultivars showed higher germinability, α-amylase activity and SOD and POX at the beginning of the experiment, but after deterioration treatment, their germinability decreased along with the activity of antioxidant enzymes.
Conclusions: In all studied cultivars, the accelerated aging and storage of seeds for six months adversely affected germination rate. This decrease was accompanied by an increase in free radicals in the seeds and a decrease in the activity of antioxidant enzymes SOD and POX, which were less severe in Khazar cultivar and more severe in Domsiyah cultivar. These results indicate the greater importance of the storage conditions in Domsiyah cultivar.
Highlights:
1- The effect of storage and seed deterioration on the activity of antioxidant enzymes, reactive oxygen species and seed germination in rice was investigated.
2- The results of accelerated aging test and natural aging were compared for a better conclusion about the response of the cultivars.
3- The two improved cultivars were compared with two local cultivars (with high cultivation area).
Introduction: Seed deterioration is associated with oxidative stress and uncontrolled accumulation of reactive oxygen species. Seeds have a group of enzymatic and non-enzymatic antioxidants that protect them against reactive oxygen species and help maintain seed vigor and support seed germination processes. The response of different cultivars to seed deterioration is different. Knowledge about the sources and mechanisms of deterioration and how different cultivars respond can help to select the appropriate cultivar for the region and also provide useful information in selecting and applying appropriate management methods for storage and increasing the storage time of seeds.
Materials and Methods: The Experiment was conducted as factorial based on a completely randomized block design with three replications. Treatments included one and six months of natural storage (4˚C, 11 percent moisture content of seeds and 60% RH) and accelerated aging (96 hours at 45˚C and 100% RH) applied on four cultivars including Hashemi, Gilaneh, Khazar and Domsiyah. Germination percentage, germination rate, shoot length, radicle length, shoot dry weight, radicle dry weight, shoot vigor index (SVI), α-amylase activity, catalase (CAT), peroxidase (POX), superoxide dismutase (SOD) activity, malondialdehyde (MDA) and hydrogen peroxide (H2O2) content were evaluated.
Results: The results showed that accelerated ageing and storage of seeds for six months led to reduced germination percentage, germination rate, shoot length, radicle length, shoot dry weight, radicle dry weight, shoot vigor index (SVI), α-amylase activity reduced in all four cultivars. This decrease was accompanied by an increase in the free radical content of MDA and H2O2 and a decrease in the activity of the antioxidant enzymes SOD and POX. Malondialdehyde content was lower in the seeds stored for six months. The activity of CAT increased after deterioration treatment, this increase was more intense in the seeds stored for six months. These seeds also showed lower H2O2 content compared to accelerated aging seeds. Khazar cultivar showed lower H2O2 content as a result of higher CAT enzyme activity. Moreover, this cultivar showed better germination percentage and germination rate after deterioration treatment compared to other cultivars. The decrease in germination percentage due to deterioration in Domsiyah was very severe. This cultivar showed the lowest germination percentage, germination rate, seed vigor and α-amylase activity in the accelerated aging treatment. Gilaneh and Hashemi cultivars showed higher germinability, α-amylase activity and SOD and POX at the beginning of the experiment, but after deterioration treatment, their germinability decreased along with the activity of antioxidant enzymes.
Conclusions: In all studied cultivars, the accelerated aging and storage of seeds for six months adversely affected germination rate. This decrease was accompanied by an increase in free radicals in the seeds and a decrease in the activity of antioxidant enzymes SOD and POX, which were less severe in Khazar cultivar and more severe in Domsiyah cultivar. These results indicate the greater importance of the storage conditions in Domsiyah cultivar.
Highlights:
1- The effect of storage and seed deterioration on the activity of antioxidant enzymes, reactive oxygen species and seed germination in rice was investigated.
2- The results of accelerated aging test and natural aging were compared for a better conclusion about the response of the cultivars.
3- The two improved cultivars were compared with two local cultivars (with high cultivation area).
Article number: 2
Type of Study: Research |
Subject:
Seed Physiology
Received: 2020/08/2 | Revised: 2024/02/20 | Accepted: 2020/10/27 | ePublished: 2022/05/21
Received: 2020/08/2 | Revised: 2024/02/20 | Accepted: 2020/10/27 | ePublished: 2022/05/21
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