Publications by authors named "Yajing Guan"

Tobacco is one of the important cash crops in China. It is sensitive to low temperature, especially in the early stage of tobacco seed germination and seedling growth. Low temperature stress directly affects the germination of tobacco seeds, leading to irregular emergence and slow growth of seedlings.

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The pollen viability directly affects the pollination process and the ultimate grain yield of rice. Here, we identified that the MORN motif-containing proteins, OsMORN1 and OsMORN2, had a crucial role in maintaining pollen fertility. Compared with the wild type (WT), the pollen viability of the osmorn1 and osmorn2 mutants was reduced, and pollen germination was abnormal, resulting in significantly lower spikelet fertility, seed-setting rate, and grain yield per plant.

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Ascorbic acid (AsA) and selenium nanoparticles (SeNPs) were versatile plant growth regulators, playing multiple roles in promoting plant growth under heavy metal stresses. This study aimed to evaluate the beneficial role of individual and combined effects of AsA and SeNPs on morpho-physio-biochemical traits of rice with or without chromium (Cr) amendment. The results indicated that Cr negatively affected plant biomass, gas exchange parameters, total soluble sugar, proline, relative water contents, and antioxidant-related gene expression via increasing reactive oxygen species (MDA, HO, O) formation, resulting in plant growth reduction.

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The bioavailability for varied-size phosphorus (P)-binding colloids (P) especially from external P sources in soil terrestrial ecosystems remains unclear. This study evaluated the differential contribution of various-sized biogas slurry (BS)-derived colloids to plant available P uptake in the rhizosphere and the corresponding patterns of phosphatase response. Keeping the same content of total P input (15 mg kg), we applied different size-fractioned BS-derived colloids including nanosized colloids (NCs, 1-20 nm), fine-sized colloids (FCs, 20-220 nm), and medium-sized colloids (MCs, 220-450 nm) respectively to conduct a 45-day rice () rhizotron experiment.

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Nickel (Ni) stress adversely affects plant growth and biomass accumulation, posturing severe menace to crop production and food security. The current study aimed to determine the putative role of sodium nitroprusside (SNP) in mitigating Ni-induced phytotoxicity and identify the underlying defense mechanisms in maize, which are poorly understood. Our findings showed that SNP significantly augmented plant growth, biomass, and photosynthesis-related attributes (Fv/Fm, Fm, qP ETR, and ΦPSII) through diminishing Ni uptake and translocation in root and shoot tissues of maize under Ni stress conditions.

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The rapid development of industrialization is causing several fundamental problems in plants due to the interaction between plants and soil contaminated with metallic nanoparticles (NPs). Numerous investigations have been conducted to address the severe toxic effects caused by nanoparticles in the past few decades. Based on the composition, size, concentration, physical and chemical characteristics of metallic NPs, and plant types, it enhances or lessens the plant growth at various developmental stages.

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Article Synopsis
  • * Both EBL and NO, when applied individually, showed positive effects in reducing Cr toxicity, but their combined application was most effective, leading to improved plant health and reduced Cr absorption.
  • * The research highlights the potential of EBL and NO as remediation agents in Cr-contaminated soils, while also calling for further studies to assess their effectiveness in real-world agricultural settings and evaluate economic impacts.
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Introduction: Mature seeds deteriorate gradually and die eventually during long-term storage. Controlled deterioration is often used to accelerate the seed deterioration rate to assess the seed vigor and physiological quality of seed lots.

Objectives: Although it is well known that the process of seed deterioration produced by controlled deterioration is distinct from that caused by long-term storage, the differences in transcriptional levels have not been reported.

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Article Synopsis
  • Chromium (Cr) significantly harms crop productivity, particularly affecting seed germination and growth in rice, with one variety (CY927) being more sensitive than another (YLY689).
  • Spermine (SPM), a polyamine compound, appears to counteract Cr toxicity, enhancing plant resilience by mitigating oxidative damage and improving nutrient and hormonal balance.
  • The study found that SPM-treated rice exhibited better growth and tolerance to Cr stress, linked to increased activity of stress-responsive genes, particularly those associated with salicylic acid.
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  • Chromium (Cr) is highly toxic to plants, which affects growth and demands strategies to prevent its accumulation in the food chain.* -
  • This study focuses on the protective effects of brassinosteroids (BRs) on two soybean cultivars under Cr stress, showing that BRs significantly reduce Cr uptake and improve plant health and growth.* -
  • BRs enhance the plant's defense mechanisms against Cr toxicity by stimulating antioxidant systems and regulating stress-related genes, making them a potential solution for combating Cr damage in agriculture.*
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Zinc oxide nano particles (ZnO NPs) have been employed as a novel strategy to regulate plant tolerance and alleviate heavy metal stress, but our scanty knowledge regarding the systematic role of ZnO NPs to ameliorate chromium (Cr) stress especially in rice necessitates an in-depth investigation. An experiment was performed to evaluate the effect of different concentrations of ZnO NPs (e.g.

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Article Synopsis
  • Two groups of rice cultivars (normal and hybrid) were tested for seed germination and survival under heavy metal stress, revealing varying levels of sensitivity and tolerance among the 28 varieties analyzed.
  • Results indicate that specific cultivars (like NV11 and HV14) show significant potential for breeding programs aimed at enhancing Cr tolerance, as they can effectively manage oxidative stress and maintain healthier growth under adverse conditions.
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Current investigation demonstrated that chromium (Cr) toxicity affects adversely on the normal growth of soybean plants. However, the seed priming with nitric oxide (NO; 100 μM), and spermine (Spm; 0.01 Mm) can significantly alleviate the Cr toxicity in soybean plant.

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Nutrient fertilization plays a major role in improving crop productivity and maintaining soil fertility. In the last few decades, the productivity of current agricultural practices highly depends on the use of chemical fertilizers. Major drawback of traditional fertilizers is their low crop nutrient use efficiency and high loss into water.

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Article Synopsis
  • The study investigates the effects of brassinosteroids (BRs) and spermine (SPM) on mitigating chromium (Cr) toxicity in two rice cultivars, highlighting their potential as growth-promoting phytohormones.
  • Results showed that treating rice seeds with BRs and/or SPM significantly improved seed germination, chlorophyll content, and overall plant health while reducing chromium accumulation and oxidative stress.
  • The combination treatment of BRs and SPM was found to be more effective than either treatment alone, particularly in the Cr-tolerant rice cultivar YLY689, suggesting a synergistic effect in combating Cr-induced damage.
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Chromium (Cr) is a serious environmental contaminant that drastically limited the crop yields. Nitric oxide (NO) and spermine (Spm) portrayal significance in improving the plant tolerance against abiotic stresses. Therefore, we investigate the protective efficacy of seed priming with NO (100μM) and/or Spm (0.

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Chilling stress greatly inhibited the seed germination, plant growth, development and productivity in this study. The current research aimed to study the effects of different polyamine (PA) inhibitor combinations (Co), e.g.

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Heat stress during seed maturation significantly reduced seed size and quality. Polyamines, especially spermidine (Spd), were reported to be closely related to seed development and plant heat tolerance. Stress-associated proteins (SAPs) also played a critical role in plant heat resistance, but the relationship between Spd and SAPs in improving rice tolerance to heat stress during grain filling has not been reported.

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Brassinosteroids (BRs) are growth-promoting hormones that exhibit high biological activities across various plant species. BRs shield plants against various abiotic stresses. In the present study, the effect of BRs against aluminum (Al) toxicity was investigated through seed priming with 24-epibrassinolide (0.

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This research was performed to explore the vital role of seed priming with a 0.01 µM concentration of brassinosteroids (EBL) to alleviate the adverse effects of Cr (100 µM) in two different rice cultivars. Seed priming with EBL significantly enhanced the germination attributes (germination percentage, germination energy, germination index, and vigor index, etc.

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Biotic and abiotic stresses, especially heavy metal toxicity, are becoming a big problem in agriculture, which pose serious threats to crop production. Plant hormones have recently been used to develop stress tolerance in a variety of plants. Brassinosteroids (BRs) are the sixth class of plant steroid hormones, with pleiotropic effects on plants.

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Article Synopsis
  • The study explored how two inhibitors of polyamine biosynthesis (D-Arg and DFMO) affect maize seedlings' growth under chilling stress, comparing tolerant and sensitive inbred lines.
  • Findings revealed that lower concentrations of these inhibitors (10 µM) improved growth measures like root length and chlorophyll content, with D-Arg showing more effectiveness than DFMO.
  • However, higher concentrations (100 µM) decreased growth and photosynthetic pigments, indicating a complex relationship between polyamine biosynthesis, chilling stress, and seedling development.
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Temperature has a large impact on plant immune responses. Earlier studies identified intracellular immune receptor nucleotide-binding leucine-rich repeat (NLR) genes and salicylic acid (SA) as targets of high-temperature inhibition of plant immunity. Here, we report that moderately low temperature enhances immunity to the bacterial pathogen in Arabidopsis ().

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Article Synopsis
  • Polyamines, particularly spermidine (Spd), are believed to help improve grain filling and heat resistance in cereals, prompting a study on their effects in hybrid rice 'YLY 689' during high-temperature conditions.
  • The research involved treating rice spikes with Spd or a synthesis inhibitor and exposing them to heat, revealing that Spd enhanced seed germination and seedling growth compared to untreated plants, while the inhibitor had opposite effects.
  • Results showed that Spd treatment led to increased activity of certain enzymes and improved the synthesis of polyamines and starch, suggesting its potential to mitigate high-temperature stress effects on rice seed quality.
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Plasma membrane (PM) recovery from the impaired dry state is essential for seed germination, but its underlying mechanism remains unclear. In this study, we found that ZmANN33 and ZmANN35, two annexin genes in maize, encode proteins that participate in PM recovery during seed germination. The expression of both genes was up-regulated during seed germination and strongly repressed by chilling (either 15 or 5 °C) as compared with the normal temperature (25 °C).

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