Proline and carbohydrate metabolism in rice varieties (Oryza sativa L.) under various drought and recovery conditions

Dien, Doan Cong; Thu, Thieu Thi Phong; Moe, Kyi; Yamakawa, Takeo

doi:10.1007/s40502-019-00462-y

Cited by 20 publications

(15 citation statements)

References 37 publications

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“…Our results showed that 'D' plants accumulated more Pro but retained less RWC in their leaves than control plants (Figure 6A,B). These observations suggest that Pro accumulation in droughtstressed plants was not sufficient to retain water under severe water-deficient environments, which also corroborated with the findings of Dien et al [52] and Rahman et al [6]. Alternatively, 'Eth + D' plants replenished water loss in the leaves without a substantial increase of Pro contents, implying that Pro accumulation might be an indicator of soybean cellular dehydration (Figure 6A,B), as also observed in other plants under drought stress [53,54].…”

Section: Discussionsupporting

confidence: 89%

Ethanol Positively Modulates Photosynthetic Traits, Antioxidant Defense and Osmoprotectant Levels to Enhance Drought Acclimatization in Soybean

et al. 2022

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Drought is a major environmental threat to agricultural productivity and food security across the world. Therefore, addressing the detrimental effects of drought on vital crops like soybean has a significant impact on sustainable food production. Priming plants with organic compounds is now being considered as a promising technique for alleviating the negative effects of drought on plants. In the current study, we evaluated the protective functions of ethanol in enhancing soybean drought tolerance by examining the phenotype, growth attributes, and several physiological and biochemical mechanisms. Our results showed that foliar application of ethanol (20 mM) to drought-stressed soybean plants increased biomass, leaf area per trifoliate, gas exchange features, water-use-efficiency, photosynthetic pigment contents, and leaf relative water content, all of which contributed to the improved growth performance of soybean under drought circumstances. Drought stress, on the other hand, caused significant accumulation of reactive oxygen species (ROS), such as superoxide and hydrogen peroxide, and malondialdehyde, as well as an increase of electrolyte leakage in the leaves, underpinning the evidence of oxidative stress and membrane damage in soybean plants. By comparison, exogenous ethanol reduced the ROS-induced oxidative burden by boosting the activities of antioxidant enzymes, including peroxidase, catalase, glutathione S-transferase, and ascorbate peroxidase, and the content of total flavonoids in soybean leaves exposed to drought stress. Additionally, ethanol supplementation increased the contents of total soluble sugars and free amino acids in the leaves of drought-exposed plants, implying that ethanol likely employed these compounds for osmotic adjustment in soybean under water-shortage conditions. Together, our findings shed light on the ethanol-mediated protective mechanisms by which soybean plants coordinated different morphophysiological and biochemical responses in order to increase their drought tolerance.

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Section: Discussionsupporting

confidence: 89%

Ethanol Positively Modulates Photosynthetic Traits, Antioxidant Defense and Osmoprotectant Levels to Enhance Drought Acclimatization in Soybean

et al. 2022

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“…Redox processes, carbohydrate metabolic processes, proteolysis and protein ubiquitination are among the most enriched biological processes within this area. Carbohydrate metabolism in rice is influenced by drought stress, daily changes in environmental conditions and characteristics of various rice varieties [ 60 ]. Ubiquitin conjugation is a major regulator of stress-responsive transcription factors and other regulatory proteins.…”

Section: Resultsmentioning

confidence: 99%

Meta-Analysis of Quantitative Traits Loci (QTL) Identified in Drought Response in Rice (Oryza sativa L.)

Selamat

Nadarajah

2021

Plants

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Rice is an important grain that is the staple food for most of the world’s population. Drought is one of the major stresses that negatively affects rice yield. The nature of drought tolerance in rice is complex as it is determined by various components and has low heritability. Therefore, to ensure success in breeding programs for drought tolerant rice, QTLs (quantitative trait loci) of interest must be stable in a variety of plant genotypes and environments. This study identified stable QTLs in rice chromosomes in a variety of backgrounds and environments and conducted a meta-QTL analysis of stable QTLs that have been reported by previous research for use in breeding programs. A total of 653 QTLs for drought tolerance in rice from 27 genetic maps were recorded for analysis. The QTLs recorded were related to 13 traits in rice that respond to drought. Through the use of BioMercartor V4.2, a consensus map containing QTLs and molecular markers were generated using 27 genetic maps that were extracted from the previous 20 studies and meta-QTL analysis was conducted on the consensus map. A total of 70 MQTLs were identified and a total of 453 QTLs were mapped into the meta-QTL areas. Five meta-QTLs from chromosome 1 (MQTL 1.5 and MQTL 1.6), chromosome 2 (MQTL2.1 and MQTL 2.2) and chromosome 3 (MQTL 3.1) were selected for functional annotation as these regions have high number of QTLs and include many traits in rice that respond to drought. A number of genes in MQTL1.5 (268 genes), MQTL1.6 (640 genes), MQTL 2.1 (319 genes), MQTL 2.2 (19 genes) and MQTL 3.1 (787 genes) were annotated through Blast2GO. Few major proteins that respond to drought stress were identified in the meta-QTL areas which are Abscisic Acid-Insensitive Protein 5 (ABI5), the G-box binding factor 4 (GBF4), protein kinase PINOID (PID), histidine kinase 2 (AHK2), protein related to autophagy 18A (ATG18A), mitochondrial transcription termination factor (MTERF), aquaporin PIP 1-2, protein detoxification 48 (DTX48) and inositol-tetrakisphosphate 1-kinase 2 (ITPK2). These proteins are regulatory proteins involved in the regulation of signal transduction and gene expression that respond to drought stress. The meta-QTLs derived from this study and the genes that have been identified can be used effectively in molecular breeding and in genetic engineering for drought resistance/tolerance in rice.

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“…This study assumed that there must be differences in the content of proline in the rice varieties as the proline accumulation in plants has been shown to correlate with drought stress tolerance. A previous study suggested that the proline accumulation in rice cultivars is an indicator of osmotic tolerance (Dien, Thu, Moe, & Yamakawa, 2019). Studies have shown that the droughttolerant crop varieties including rice accumulate proline in high concentrations than unstressed and nontolerant varieties (Per et al, 2017;Sahoo et al, 2019;Szabados & Savouré, 2010).…”

Section: High Proline Concentration In the Rice Landracesmentioning

confidence: 99%

Effect of Water-Deficit Stress on the Selected Landraces and Improved Varieties of Rice (Oryza sativa L.) in Nepal

2020

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Water stress is one of the adverse factors affecting growth, development and productivity of rice. It is crucial to explore the drought tolerant rice varieties and improve their quality for sustainable production for droughtprone environments. The aim of this study was to know the ability of selected landraces (Aapjhutta, Kartika, Aanadi and Jhapamansuli) and improved varieties (Khumal-8, Khumal-10, Khumal-11 and Chainung-242) of rice to tolerate water-deficit stress in Nepal. The rice plants were grown in polyethylene pots. The pots were watered for the first two days of seedling transplantation and then watering was stopped. Survival and survival probability of seedlings were calculated. In addition, the concentration of an osmolyte (proline) was estimated after complete death of the plants in each variety. Two rice varieties, Jhapamansuli and Aapjhutta showed the highest seedling survival under water-deficit stress than the improved and other rice varieties. Results indicated that these two varieties have the ability to survive better than others under the stress by accumulating a high amount of proline as a compatible solute. Thus, these varieties can be preserved and utilized for breeding activities to develop drought tolerant and high yielding varieties.

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Proline and carbohydrate metabolism in rice varieties (Oryza sativa L.) under various drought and recovery conditions

Cited by 20 publications

References 37 publications

Ethanol Positively Modulates Photosynthetic Traits, Antioxidant Defense and Osmoprotectant Levels to Enhance Drought Acclimatization in Soybean

Ethanol Positively Modulates Photosynthetic Traits, Antioxidant Defense and Osmoprotectant Levels to Enhance Drought Acclimatization in Soybean

Meta-Analysis of Quantitative Traits Loci (QTL) Identified in Drought Response in Rice (Oryza sativa L.)

Effect of Water-Deficit Stress on the Selected Landraces and Improved Varieties of Rice (Oryza sativa L.) in Nepal

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