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2025, 14(65): 1-20 |
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Esmaeilzadeh-Moridani M, Esfahani M, Aalami A, Moumeni A, Khaledian M. Evaluation of root response to drought stress in aerobic, flooded and upland rice genotypes (Oryza sativa L.). Plant Process and Function 2025; 14 (65) : 1
URL: http://jispp.iut.ac.ir/article-1-2106-en.html
URL: http://jispp.iut.ac.ir/article-1-2106-en.html
Mahjoubeh Esmaeilzadeh-Moridani1 
, Masoud Esfahani * 2, Ali Aalami3 , Ali Moumeni4 , Mohammadreza Khaledian5
, Masoud Esfahani * 2, Ali Aalami3 , Ali Moumeni4 , Mohammadreza Khaledian5
1- Department of Agronomy and Plant Breeding, Faculty of Agricultural Sciences, University of Guilan, Rasht and Crop and Horticultural Science Research Department, Southern Kerman Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), Jiroft, Iran
2- Department of Agronomy and Plant Breeding, University of Guilan, Guilan, Iran ,esfahani@guilan.ac.ir
3- Department of Agronomy and Plant Breeding, University of Guilan, Guilan, Iran
4- Rice Research Institute of Iran, Mazandaran Branch, Agricultural Research, Education and Extension Organization, Amol, Iran
5- Department of Water Enginearing, University of Guilan, Rasht, Iran and Department of Water Engineering and Environment, Caspian Sea Basin Research Center, Rasht, Iran
2- Department of Agronomy and Plant Breeding, University of Guilan, Guilan, Iran ,
3- Department of Agronomy and Plant Breeding, University of Guilan, Guilan, Iran
4- Rice Research Institute of Iran, Mazandaran Branch, Agricultural Research, Education and Extension Organization, Amol, Iran
5- Department of Water Enginearing, University of Guilan, Rasht, Iran and Department of Water Engineering and Environment, Caspian Sea Basin Research Center, Rasht, Iran
Abstract: (108 Views)
The experiment was conducted in two consecutive years (2015 and 2016) at the Faculty of Agriculture of Guilan University, Rasht, Iran. Cultivation was done in polyethylene pipes in both years. In the first year, the experiment was conducted with 16 (aerobic, upland and lowland) rice genotypes under optimal irrigation conditions, using a completely randomized design with three replicates. Based on cluster analysis results four cultivars Vandana, Neda, Tarom Mahalli, and one upland (IR83141-11) genotype were selected for the second year experiment. The second-year experiment was a factorial design conducted with complete randomization and three replications. The factors were included four rice genotypes and soil water conditions (full irrigation and drought stress). The results indicated that drought stress reduced both the dry matter and growth rates of shoots and roots in rice cultivars. The difference in shoot dry matter between the two irrigation conditions was greater in the Tarom Mahalli (16.2 g.plant-1) compared to the upland genotype (6.7 g.plant-1) and other genotypes. The shoot was more affected by drought stress than the root. The difference in root dry matter between the two irrigation conditions was greater in the Tarom mahalli (1 g.plant-1) and upland genotype (0.09 g.plant-1) and other genotypes. The root dry matter variation between the two irrigation conditions was greatest in the Tarom Mahalli (1 g.plant-1) and lowest in the upland (0.09 g.plant-1). Drought conditions led to a shorter timeframe for the Vandana cultivar to reach maximum growth rate and achieve maximum dry matter accumulation, with growth rate accelerating by three days and accumulation occurring six days earlier. Due to drought stress, the time to reach maximum root dry matter decreased in Neda and Vandana cultivars (with a difference of 4.65 and 0.13 days) and increased in upland genotype and Tarom Mahalli cultivar (2.5 and 6.5 days). Drought stress caused a five-day acceleration and a seven-day delay in reaching the maximum accumulation of root dry matter in Neda and Tarom Mahalli cultivars, respectively. Aerobic and upland genotypes displayed a greater root-to-shoot ratio compared to lowland genotypes, particularly during the initial growth stages, suggesting a more extensive root system in these genotypes. Except for the Tarom Mahalli, drought stress increased root dry weight in other genotypes at most soil depths compared to full irrigation. These traits play a crucial role in breeding programs, particularly those focused on drought tolerance, in order to develop resilient cultivars that can withstand challenging conditions. In this experiment, it is suggested that further research could be conducted on the Vandana, upland, and Neda genotypes due to their superior root traits.
Article number: 1
Type of Study: Research |
Subject:
Droughts Stress
Received: 2024/08/6 | Accepted: 2024/10/15 | Published: 2025/05/3
Received: 2024/08/6 | Accepted: 2024/10/15 | Published: 2025/05/3
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