Article
Agronomy
Felipe de Campos Carmona, Janete Mariza Adamski, Andriele Wairich, Joseane Biso de Carvalho, Gustavo Gomes Lima, Ibanor Anghinoni, Isadora Rodrigues Jaeger, Paulo Regis Ferreira da Silva, Tatiana de Freitas Terra, Janette Palma Fett, Filipe Selau Carlos
Summary: Permanent soil flooding resulted in higher grain yield and malondialdehyde (MDA) concentrations in leaves in plants from the resistant genotype IRGA 425 compared to the sensitive genotype BR-IRGA 409. In contrast, two cycles of alternate soil drying resulted in equivalent grain yield and MDA concentrations in both genotypes. Resistance to iron toxicity in IRGA 425 plants seems related to limited Fe translocation to shoots, increased tolerance to oxidative stress in leaves, and higher expression of Ferritin, OsGAP1, OsWRKY80, and Oryzain-alpha genes. Plants from the BR-IRGA 409 cultivar (sensitive to Fe toxicity) improved growth and yield under the interrupted irrigation treatments, probably due to lower Fe availability in the soil solution. Management of water irrigation successfully alleviated Fe toxicity in rice plants cultivated in field conditions.
Article
Agronomy
Decha Songtoasesakul, Wanchana Aesomnuk, Sarinthip Pannak, Jonaliza Lanceras Siangliw, Meechai Siangliw, Theerayut Toojinda, Samart Wanchana, Siwaret Arikit
Summary: Rice, as a staple food crop, is crucial for global food security, but soil salinity hampers its productivity. In this study, 160 RILs were evaluated for salt tolerance at the seedling stage, leading to the identification of nine QTLs associated with salt tolerance. The analysis of coding sequence variants and gene expression under salt stress highlighted 47 candidate genes, including Os01g0200700 and Os12g0625000, which could potentially improve rice productivity and resistance under salt stress conditions during the critical seedling stage.
Review
Plant Sciences
Nitasana Rajkumari, Soni Chowrasia, Jyoti Nishad, Showkat Ahmad Ganie, Tapan Kumar Mondal
Summary: This study discusses the role of salinity responsive metabolites in rice and its wild species. Salinity stress severely affects rice productivity, and while many important physiological and molecular responses have been studied, the role of salt stress and microbes-induced metabolites in overcoming salt stress in rice has been less explored. Metabolomic studies have allowed for a comprehensive analysis of rice salt stress responses. This review discusses the alterations in various metabolites triggered by salt stress in rice and their significant roles in salinity tolerance, including as signaling molecules and protective agents. The accumulation of metabolites induced by salinity stress varies between salt-sensitive and tolerant rice genotypes, contributing to their different degrees of salt tolerance. Additionally, certain tolerance metabolites may induce unique pathways for defense mechanisms in salt-tolerant rice varieties, suggesting their potential roles as universal biomarkers for salt tolerance. The review also explores the involvement of rhizosphere microbes in rice salt tolerance. Overall, this study provides valuable insights into salt-induced metabolites in different rice genotypes and their relationships with stress genes, offering a reference point for biomarker design in rice. It also helps to decipher metabolic systems associated with salt tolerance in rice, which can be useful for developing salt-tolerant rice cultivars through conventional breeding, genetic engineering, or exogenous application of metabolites.
Article
Soil Science
Ning Chen, Xianyue Li, Jiri Simunek, Haibin Shi, Qi Hu, Yuehong Zhang
Summary: The study showed that biodegradable film mulching (BM) has more advantages in terms of soil temperature control compared to plastic film mulching (PM) and no film mulching (NM), being able to effectively preserve heat and prevent the detrimental effects of high temperatures on crops.
SOIL & TILLAGE RESEARCH
(2021)
Article
Agronomy
Matthew Champness, Carlos Ballester, John Hornbuckle
Summary: Declining water availability is leading rice growers to adopt water-saving irrigation practices like aerobic rice in order to maintain profitability per megalitre of water input. This study aimed to investigate the effect of increasing soil moisture deficit during the rice vegetative period in a temperate Australian environment. The research found that extending soil moisture deficit beyond 15 kPa significantly delayed panicle initiation and reduced yield, but sound water productivity can still be achieved with aerobic rice cultivation in temperate climates.
Article
Biotechnology & Applied Microbiology
Xiaoning Ren, Jiahui Fan, Xin Li, Yu Shan, Lanlan Wang, Lianju Ma, Yueying Li, Xuemei Li
Summary: RNA-seq analysis revealed that salt-alkali stress inhibits rice seedling growth and leads to significant molecular changes. These changes involve processes such as biosynthesis and metabolism, enzyme activity, and binding. This study provides insights into potential regulators of plant response to salt-alkali stress and offers a potential strategy for improving salt-alkali stress tolerance in rice.
Article
Environmental Sciences
Carmen Martin-Franco, Jaime Terron Sanchez, Paula Alvarenga, David Pena, Damian Fernandez-Rodriguez, Luis Andres Vicente, Angel Albarran, Antonio Lopez-Pineiro
Summary: The use of fresh and field-aged biochar can reduce the bioaccumulation of arsenic, cadmium, and lead in rice grains and improve the commercial value of rice. Sprinkler irrigation can reduce the accumulation of cadmium in rice, and biochar application can counteract this effect. The application of biochar can prevent the accumulation of lead, but may need to be repeated to maintain the same beneficial effect.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Biochemistry & Molecular Biology
Jiajia Wang, Yiting Liu, Songping Hu, Jing Xu, Jinqiang Nian, Xiaoping Cao, Minmin Chen, Jiangsu Cen, Xiong Liu, Zhihai Zhang, Dan Liu, Li Zhu, Jiang Hu, Deyong Ren, Zhenyu Gao, Lan Shen, Guojun Dong, Qiang Zhang, Qing Li, Sibin Yu, Qian Qian, Guangheng Zhang
Summary: Leaf morphology is an important trait for plant architecture and stress resistance. In this study, a rice mutant, ltr1, with rumpled leaves and decreased grain yield was identified. LTR1, a wax synthesis gene, was found to be constitutively expressed in various tissues, with higher expression in leaves and panicles. Overexpression of LTR1 increased grain yield and positively regulated salt stress by affecting water and ion homeostasis. These findings provide insights into the molecular mechanisms of leaf morphogenesis and stress response, and offer a potential strategy for stress-tolerance breeding.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Plant Sciences
Shenghai Ye, Zhibo Huang, Guibin Zhao, Rongrong Zhai, Jing Ye, Mingming Wu, Faming Yu, Guofu Zhu, Xiaoming Zhang
Summary: This study identified two currently cultivated japonica rice species with similar backgrounds, Zhegeng 78 (salt-tolerant) and Zhegeng 99 (salt-sensitive), and investigated their differential responses to salt stress at different growth stages. The salt-tolerant Zhegeng 78 showed significantly higher expression of salt tolerance-related genes, lower Na+ uptake rate, higher K+ uptake rate, higher peroxidase activity, and lower hydrogen peroxide accumulation compared to the salt-sensitive Zhegeng 99 under salt stress, indicating its potential value in future cultivation in saline soils.
Article
Plant Sciences
Xiaoning Ren, Yu Shan, Xin Li, Jiahui Fan, Yueying Li, Lianju Ma, Lanlan Wang, Xuemei Li
Summary: This study aimed to understand the molecular mechanisms underlying the beneficial effects of endophytes on rice seedlings under salt-alkaline stress. RNA sequencing analysis revealed differential gene expression in the roots and shoots of rice seedlings with or without endophytic infection under salt-alkaline treatment. Functional annotation of the differentially expressed genes (DEGs) revealed processes related to biosynthesis, energy metabolism, enzyme activity, photosynthesis, ROS-scavenging system, and hormonal signaling that contribute to the growth-promoting effects of the endophytes.
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
(2022)
Article
Plant Sciences
Qiang Xu, Hongguang Liu, Mingsi Li, Pengfei Li
Summary: This study investigated the effects of different irrigation volumes and planting densities on the growth and salt uptake of Suaeda salsa under drip irrigation. The study found that irrigation volume, planting density, and their interaction significantly affected the growth characteristics of Suaeda salsa, as well as its ability to absorb salt.
Article
Plant Sciences
Alenna Vazquez-Glaria, Bettina Eichler-Loebermann, F. G. Loiret, Eduardo Ortega, Mareike Kavka
Summary: Soil salinity is a critical issue for rice production and is often linked to phosphorus deficiency. Plant hormones such as brassinosteroids have been shown to play a role in plant response to stress. This study compared the growth and root characteristics of two rice cultivars under salt stress, phosphorus limitation, and brassinosteroid treatment. The results showed that salt mainly affected root size and extent, while phosphorus supply mitigated the negative effects of salt on root growth in one of the cultivars. Brassinosteroid treatment had minimal impact on plant development in both experiments. Root traits may be useful for selecting salt-tolerant and phosphorus-efficient rice cultivars.
Article
Agronomy
Xiao-chuang Cao, Long-long Wu, Ruo-hui Lu, Lian-feng Zhu, Jun-hua Zhang, Qian-yu Jin
Summary: The study revealed significant effects of water regimes and nitrogen application rates on rice yield, water productivity, and nitrogen recovery efficiency. The optimal comprehensive benefits were achieved at water quantity and nitrogen application rate of 11,000 m3 ha(-1) and 160 kg N ha(-1) respectively. The optimization model can save water input and nitrogen application rate by approximately 17.0% and 11.1% respectively, compared to the traditional strategy. Further validation and adaptation research is needed for larger-scale field application.
IRRIGATION SCIENCE
(2021)
Article
Biochemistry & Molecular Biology
Sara Cimini, Vittoria Locato, Valentina Giacinti, Michela Molinari, Laura De Gara
Summary: Understanding the metabolic alterations in response to stress in tolerant and sensitive plants is crucial for improving plant resilience. This study investigated the mechanisms underlying salt tolerance in two rice varieties and found that the differential regulation of cell-cycle progression and cell-death patterns at the root level is consistent with the different phenotypes observed after salt exposure. The tolerant variety showed a highly responsive antioxidative capacity and a different pattern of H2O2 accumulation compared to the sensitive variety. These findings highlight the role of ROS and antioxidative pathways in rice's response to salt stress.
Article
Environmental Sciences
Jinping Feng, Hongguang Liu, Gang Wang, Rumeng Tian, Minghai Cao, Zhentao Bai, Tianming He
Summary: Winter irrigation is an effective method for reducing soil salinity, but the long-term effects may vary among different soil types. After several years of application, soil salinity tends to stabilize at a lower level. Different types of soil show varying degrees of desalination effects after winter irrigation, with significant improvements observed after several years.
