Article
Plant Sciences
Haoquan Wang, Huan Lu, Zixuan Yang, Zixu Zhang, Mengshuo Li, Zheng Zhang, Weimin Dai, Xiaoling Song, Kenneth M. Olsen, Sheng Qiang
Summary: The lodging variation among different Chinese weedy rice strains and between weedy rice and cultivated rice was compared in this study. The results showed that indica-derived weedy rice strains had higher lodging levels in southern China, while japonica-derived strains had lower lodging levels in the north. The more lodging-prone indica weedy rice had lower bending stress and lignin content, and a lower cellulose to lignin ratio compared to co-occurring cultivated rice. DNA methylation of lignin synthesis-related genes affected the expression levels and the cellulose to lignin ratio, thus regulating lodging variation in weedy rice.
JOURNAL OF EXPERIMENTAL BOTANY
(2023)
Article
Agriculture, Multidisciplinary
Hao-quan Wang, Wei-min Dai, Zi-xu Zhang, Meng-shuo Li, Ling-chao Meng, Zheng Zhang, Huan Lu, Xiao-ling Song, Sheng Qiang
Summary: Through a systematic survey of rice-growing regions in China, it was found that weedy rice had an occurrence incidence of 39% and was mainly distributed in the eastern, northeastern, northwestern, and southern parts of China. Further research revealed that the morphology and biotype of weedy rice differed based on geographical location, climate, and cultivated rice type. Therefore, it is recommended to adopt comprehensive control strategies and recognize the harmfulness of weedy rice.
JOURNAL OF INTEGRATIVE AGRICULTURE
(2023)
Article
Agronomy
Leonard Bonilha Piveta, Nilda Roma-Burgos, Jose Alberto Noldin, Vivian Ebeling Viana, Claudia de Oliveira, Fabiane Pinto Lamego, Luis Antonio de Avila
Summary: Rice, the staple food for many people worldwide, is affected by climatic changes impacting its yield and quality. Weedy rice, with high genetic diversity, is crucial for rice crop improvement. This study analyzed the physiological and molecular profiles of rice cultivars and weedy rice under heat and drought stress, revealing genotype-specific responses to stress conditions. Research suggests that certain genotypes perform well under stress conditions and can be used as a source of genetic diversity for rice breeding.
Article
Plant Sciences
Zhuan Li, Rui Gui, Xiaoyu Yu, Chengwei Liang, Juan Cui, Xue Zhao, Xuemin Zhang, Pengcheng Yu, Wenfu Chen, Jian Sun
Summary: In this study, a natural population consisting of weedy rice, japonica landrace, and japonica cultivar was used to conduct a genome-wide association study (GWAS) and a QTL mapping analysis of the heading date. Several loci and genes associated with the early heading of weedy rice were identified. Furthermore, by introducing gene fragments from weedy rice into super-high-yielding japonica rice, the heading date of the cultivated rice was successfully promoted and the rice cultivation area was expanded northward.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Agronomy
Monrawee Fukuda, Toshiyuki Imaizumi, Akira Koarai
Summary: This study investigated the effects of temperature and water availability on seed germination of different strains of weedy rice. The results showed that the germination rate was influenced by the degree of seed dormancy, water availability, and temperature. The shallow-dormant tropical japonica-derived strawhull weedy rice exhibited germination at 10℃ and showed more synchronous germination with cultivated rice. These findings are important for predicting weedy rice infestation and designing effective control measures.
PEST MANAGEMENT SCIENCE
(2023)
Article
Agronomy
Intan Filzah Mahmod, Saharshini Jeyasimman, Muhamad Shakirin Mispan, Farahaniza Supandi, Alfi Khatib, Mohd Zuwairi Saiman
Summary: This study aimed to investigate the metabolite profiles and chemical diversity of Malaysian weedy rice. The analysis using nuclear magnetic resonance-based metabolomics revealed that weedy rice and cultivated rice are distinctly different, with higher levels of GABA, α-glucose, fumaric acid, and phenylalanine in weedy rice, and higher levels of valine, leucine, isoleucine, fatty acids, 2,3-butanediol, threonine, alanine, butyric acid, choline, γ-oryzanol, fructose, β-glucose, sucrose, ferulic acid, and formic acid in cultivated rice. In addition, differences between weedy rice samples from the west coast and east coast regions of Peninsular Malaysia were also observed.
Article
Agronomy
Rashidah Ruslan, Siti Khairunniza-Bejo, Mahirah Jahari, Mohd Firdaus Ibrahim
Summary: This study presents image processing and machine learning techniques to classify weedy rice seed variants and cultivated rice seeds. Results showed that the best optimum model was developed by the RGB image using the logistic regression (LR) model that achieved high sensitivity and accuracy in identifying the weedy rice seeds.
Article
Plant Sciences
Can Zhao, Wenrong Xu, Hewei Li, Weimin Dai, Zheng Zhang, Sheng Qiang, Xiaoling Song
Summary: Weedy rice matures earlier than cultivated rice due to shorter grain-filling periods and rapid endosperm development. The cytological process in weedy rice endosperm cells is faster and earlier, with lower cell viability and antioxidant enzyme activity compared to cultivated rice. These differences may contribute to the early maturity of weedy rice.
FRONTIERS IN PLANT SCIENCE
(2021)
Article
Biology
Marshall J. Wedger, Nilda Roma-Burgos, Kenneth M. Olsen
Summary: This study investigates the genomic consequences of crop-weed hybridization and selection for herbicide resistance in weedy rice using whole-genome sequences. The results reveal recent genetic introgression and adaptation that is altering crop-weed dynamics across southern USA.
COMMUNICATIONS BIOLOGY
(2022)
Article
Chemistry, Applied
Kyong-Hee Nam, Do Young Kim, In Soon Pack, Chang-Gi Kim
Summary: The metabolite profiles of transgenic rice and weedy rice were distinct, while F-2 progeny showed partial separation from their parents with unaffected zygosity. F-2 progeny had similar or intermediate levels of most major nutritional components compared to their parents, but showed higher levels of certain metabolites. Changes in metabolite levels of transgenic crop-weed hybrids compared to parents may impact ecological consequences, nutritional quality, and food safety.
Article
Plant Sciences
Chang-Min Lee, Hyun-Su Park, Man-Kee Baek, O-Young Jeong, Jeonghwan Seo, Suk-Man Kim
Summary: Climate change has threatened the stability of crop cultivation and production due to global warming. Pre-harvest sprouting (PHS) poses a threat to crops, especially staple foods like rice, resulting in reduced yield and quality. In this study, QTL analysis was performed to identify genetic markers associated with PHS resistance using RILs populations derived from weedy rice in Korea. The analysis revealed two stable QTLs, qPH7 and qPH2, on chromosomes 7 and 2 respectively, explaining around 38% of the phenotypic variation. Fine mapping of qPH7 identified a specific region on chromosome 7 associated with PHS, and the upregulated expression of the Os07g0584366 gene was found in the resistant donor. Japonica lines with QTLs related to PHS resistance were developed to improve PHS characteristics and facilitate marker-assisted backcrossing with susceptible cultivars.
FRONTIERS IN PLANT SCIENCE
(2023)
Article
Biochemistry & Molecular Biology
Toshiyuki Imaizumi, Yoshihiro Kawahara, Gabriela Auge
Summary: Hybridization between weedy and cultivated rice can stabilize and transmit adaptive traits, such as seed dormancy. This study found that hybrid-derived weedy rice strains maintained adaptive allele combinations for seed dormancy, despite equal representation of parental weedy and cultivated rice in the genome. The hybrid-derived strains were more dormant than the parental weedy rice strains.
Article
Biochemistry & Molecular Biology
Xiang Li, Shulin Zhang, Daniel Lowey, Carter Hissam, Josh Clevenger, Sherin Perera, Yulin Jia, Ana L. Caicedo
Summary: Weedy rice is a weedy relative of cultivated rice that competes with the crop and causes production loss. This study used a QTL-seq approach to identify QTLs related to weediness traits in BHA weedy rice. The results showed that QTLs detected through ancestor-descendant crosses are more likely to be involved in the evolution of weediness traits.
Article
Plant Sciences
Zhi Wang, Xingxing Cai, Xiao-Qi Jiang, Qi-Yu Xia, Lin-Feng Li, Bao-Rong Lu
Summary: Sympatric genetic divergence is an intriguing and controversial pattern in the theory of ecological speciation. The analysis of genomic DNA sequences of weedy rice populations in the same fields but different seasons reveals significant genetic divergence between the populations, suggesting the role of temporal isolation in creating genetic divergence.
Article
Agronomy
Leonard Bonilla Piveta, Jose Alberto Noldin, Nilda Roma-Burgos, Vivian Ebeling Viana, Lariza Benedetti, Jesus Juares Oliveira Pinto, Fabiane Pinto Lamego, Luis Antonio de Avila
Summary: This study characterized the morphological diversity of weedy rice in southern Brazil, analyzing 249 accessions from Rio Grande do Sul (RS) and Santa Catarina (SC) states. All accessions were of indica lineage and separated into 14 distinct groups based on phenotypic traits, with high variability in flowering time, indicating potential for gene flow and diverse responses to weed management in herbicide-resistant rice planting.