Effects of Salinity Stress at Reproductive Growth Stage on Rice (Oryza sativa L.) Composition, Starch Structure, and Physicochemical Properties

Yao, Dongping; Wu, Jun; Luo, Qiuhong; Zhang, Dongmeng; Zhuang, Wen; Xiao, Gui; Deng, Qipan; Bai, Bin

doi:10.3389/fnut.2022.926217

Cited by 12 publications

(8 citation statements)

References 36 publications

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“…Salinity stress in plants can be a lethal factor that limits the normal functioning of plants and eventually affects growth and productivity. At elevated salinity levels, all growth stages (seed germination, seedling, vegetative growth and maturity), as well as the quality of the seeds/fruits, are negatively affected (Jafarzadeh and Aliasgharzad 2007 , Yao et al 2022 ). Germination and seedling establishment are the most crucial stages in the plant life cycle.…”

Section: Discussionmentioning

confidence: 99%

Fungal endophytes from saline-adapted shrubs induce salinity stress tolerance in tomato seedlings

Mutungi,

Wekesa,

Onguso

et al. 2024

FEMS Microbes

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To meet the food and feed demands of the growing population, global food production needs to double by 2050. Climate change-induced challenges to food crops, especially soil salinization, remain a major threat to food production. We hypothesize that endophytic fungi isolated from salt-adapted host plants can confer salinity stress tolerance to salt-sensitive crops. Therefore, we isolated fungal endophytes from shrubs along the shores of saline alkaline Lake Magadi and evaluated their ability to induce salinity stress tolerance in tomato seeds and seedlings. Of 60 endophytic fungal isolates, 95% and 5% were from Ascomycetes and Basidiomycetes phyla, respectively. The highest number of isolates (48.3%) were from the roots. Amylase, protease, and cellulase were produced by 25, 30, and 27 isolates, respectively; and 32 isolates solubilized phosphate. Only 8 isolates grew at 1.5 M NaCl. Four fungal endophytes (Cephalotrichum cylindricum, Fusarium equiseti, Fusarium falciforme, and Aspergilus puniceus) were tested under greenhouse conditions for their ability to induce salinity tolerance in tomato seedlings. All four endophytes successfully colonized tomato seedlings and grew in 1.5 M NaCl. The germination of endophyte-inoculated seeds was enhanced by 23% %, whereas seedlings showed increased chlorophyll and biomass content and decreased hydrogen peroxide content under salinity stress, as compared to control. The results suggest that the the four isolates can potentially be used to mitigate salinity stress in tomato plants in salt-affected soils.

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Section: Discussionmentioning

confidence: 99%

Fungal endophytes from saline-adapted shrubs induce salinity stress tolerance in tomato seedlings

Mutungi,

Wekesa,

Onguso

et al. 2024

FEMS Microbes

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“…6b ), which is different from most other reported transcription factors with positive regulatory roles on the Wx gene 7 , 9 , 39 . Furthermore, rice AC is also sensitive to environmental stress, such as high temperature and salt stress, both of which will result in reduced AC 40 , 41 . Considering the pleiotropic effects of ABA, especially on rice AC and abiotic stress response, the revealed molecular mechanism of ABA in regulating Wx expression will be beneficial for future breeding of elite rice varieties with comprehensive traits improved by fine modulation of the ABA pathway.…”

Section: Discussionmentioning

confidence: 99%

ABA-mediated regulation of rice grain quality and seed dormancy via the NF-YB1-SLRL2-bHLH144 Module

Wang,

Huang

et al. 2024

Nat Commun

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Abscisic acid (ABA) plays a crucial role in promoting plant stress resistance and seed dormancy. However, how ABA regulates rice quality remains unclear. This study identifies a key transcription factor SLR1-like2 (SLRL2), which mediates the ABA-regulated amylose content (AC) of rice. Mechanistically, SLRL2 interacts with NF-YB1 to co-regulate Wx, a determinant of AC and rice quality. In contrast to SLR1, SLRL2 is ABA inducible but insensitive to GA. In addition, SLRL2 exhibits DNA-binding activity and directly regulates the expression of Wx, bHLH144 and MFT2. SLRL2 competes with NF-YC12 for interaction with NF-YB1. NF-YB1 also directly represses SLRL2 transcription. Genetic validation supports that SLRL2 functions downstream of NF-YB1 and bHLH144 in regulating rice AC. Thus, an NF-YB1-SLRL2-bHLH144 regulatory module is successfully revealed. Furthermore, SLRL2 regulates rice dormancy by modulating the expression of MFT2. In conclusion, this study revealed an ABA-responsive regulatory cascade that functions in both rice quality and seed dormancy.

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“…The physicochemical qualities of starch are commonly used as a standard for assessing the cooking and eating quality, including amylose content, chain length distribution of amylopectin, and the stability of the starch structure [18,21]. It was discovered that subjecting rice plants to moderate salt stress (5 dS/m electrical conductivity) and high salt stress (12 dS/m) during the reproductive growth stage significant results in poor appearance and milling quality of the rice, as well as a higher protein content [22]. Furthermore, there has been an increase in the percentage of medium and long chains of amylopectin in rice, while the amylose content and proportion of short-chain amylopectin have decreased [22].…”

Section: Introductionmentioning

confidence: 99%

“…It was discovered that subjecting rice plants to moderate salt stress (5 dS/m electrical conductivity) and high salt stress (12 dS/m) during the reproductive growth stage significant results in poor appearance and milling quality of the rice, as well as a higher protein content [22]. Furthermore, there has been an increase in the percentage of medium and long chains of amylopectin in rice, while the amylose content and proportion of short-chain amylopectin have decreased [22]. Sangwongchai et al [18] studied the impacts of moderate salt levels (4 dS/m) on the physicochemical properties of starch in four rice cultivars during the reproductive growth period, and found that the responses to salt stress can vary due to genotypic differences.…”

Section: Introductionmentioning

confidence: 99%

Effects of Salt Stress on Grain Quality and Starch Properties of High-Quality Rice Cultivars

Cui,

Zhou,

Shu

et al. 2024

Agronomy

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In recent days, there has been a noticeable surge in demand for high-quality rice. However, the influences of salinity on the quality and starch properties of high-quality rice remain unclear. Three high-quality rice cultivars (Nanjing 9108, Nanjing 5055, and Nanjing 46) were studied to investigate the responses of grain quality to salt stress. There were three treatments, including a control zero salt level (0 g·kg−1, CK), and two salt levels of 0.1 g·kg−1 (0.1% salt stress, T1) and 0.2 g·kg−1 (0.2% salt stress, T2). The study involved the assessment of the appearance, milling, cooking, and eating qualities of rice. We also conducted an analysis of pasting properties, an evaluation of starch thermal properties, and an examination of the fine structure of amylopectin. The findings suggest that as the level of salt stress increases, the yield of rice gradually declines, which is primarily due to a significant reduction in the total spikelet number and the ratio of filled grains. Compared with CK treatment, the appearance and milling quality of rice were significantly improved within the T1 treatment. In addition, the protein concentration and amylose concentration were significantly decreased, the gel consistency was significantly increased, and the cooking and eating qualities were improved. In terms of starch properties, the peak viscosity, breakdown value, infrared ratio (1022/995), and short-chain-length amylopectin ratio increased significantly, while the setback value, pasting temperature, gelatinization enthalpy, relative crystallinity, and infrared ratio (1045/1022) decreased significantly. When comparing T2 with CK, the appearance quality and cooking and eating quality had deteriorated, and the milling quality was improved. The changes in the structural and physicochemical properties of starch were opposite to those in the comparison between the T1 treatment and the CK group. Accordingly, we propose that moderate salt stress has the potential to enhance rice quality, even though there may be a slight decrease in yield. This indicates that it is feasible to cultivate high-quality rice in saline–alkali beach areas.

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Effects of Salinity Stress at Reproductive Growth Stage on Rice (Oryza sativa L.) Composition, Starch Structure, and Physicochemical Properties

Cited by 12 publications

References 36 publications

Fungal endophytes from saline-adapted shrubs induce salinity stress tolerance in tomato seedlings

Fungal endophytes from saline-adapted shrubs induce salinity stress tolerance in tomato seedlings

ABA-mediated regulation of rice grain quality and seed dormancy via the NF-YB1-SLRL2-bHLH144 Module

Effects of Salt Stress on Grain Quality and Starch Properties of High-Quality Rice Cultivars

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