Article
Agronomy
Yeotae Yun, Gyucheol Kim, Giwon Cho, Tugsang Yun
Summary: This study investigated the effects of transplanting date on agronomic and grain quality traits of two early-maturing rice varieties. The experiment was conducted in South Korea from April to July in 2019 and 2020. Results showed that earlier transplanting led to a longer duration from transplanting to heading, and delayed transplanting decreased spikelet number and milled rice yield. The temperature during grain filling stage was negatively correlated with head rice rate, and the number of days from transplanting to heading showed a negative correlation with protein content.
Article
Agronomy
Le Xu, Shen Yuan, Xinyu Wang, Zhifeng Chen, Xiaoxiao Li, Jing Cao, Fei Wang, Jianliang Huang, Shaobing Peng
Summary: This study aims to explore whether direct-seeded, double-season rice (DSD) with ultrashort-duration varieties can be as productive and efficient in nitrogen use as transplanted double-season rice (TPD) in central China. The results showed that DSD had comparable or higher grain yield and nitrogen use efficiency than TPD, and performed better in terms of leaf area, stem number, intercepted radiation, and radiation use efficiency.
Article
Agronomy
Wenxia Wang, Jie Du, Ziming Wu, Yongjun Zeng, Xiaohua Pan, Shanmei Cheng, Yanhua Zeng
Summary: Low temperature chilling damage often occurs in rice seedlings, especially direct-seeded early indica rice, and flooding can alleviate this damage. However, the molecular mechanism by which flooding alleviates low temperature stress-induced damage is poorly understood. In this study, LT, LTF, and CK treatments were established to investigate the phenotype, agronomic traits, and transcriptomic changes in direct-seeded early indica rice at the seedling stage. The results showed that flooding could reduce the damage caused by low temperature to the agronomic characters of rice seedlings. Physiological characteristics and transcriptomic profiling revealed that flooding affected soluble protein content, enzyme activity, and the expression of genes involved in photosynthesis, energy metabolism, and signal transduction pathways. These findings contribute to our understanding of the physiological and genetic changes underlying the alleviation of low temperature stress by flooding.
Article
Biotechnology & Applied Microbiology
Wenxia Wang, Jie Du, Liming Chen, Yongjun Zeng, Xueming Tan, Qinghua Shi, Xiaohua Pan, Ziming Wu, Yanhua Zeng
Summary: The study found that flooding can alleviate the damage to chloroplast structure caused by LT in rice seedlings. Physiological characteristics showed that LTF significantly increased the contents of rubisco, chlorophyll, PEPCK, ATP and GA(3) but significantly decreased soluble protein, MDA and ABA contents compared to LT. Transcriptomic and proteomic studies identified a large number of transcripts and proteins, with shared genes at both levels significantly enriched in various metabolic pathways.
Review
Biochemistry & Molecular Biology
Siddharth Panda, Prasanta Kumar Majhi, Annamalai Anandan, Anumalla Mahender, Sumanth Veludandi, Debendranath Bastia, Suresh Babu Guttala, Shravan Kumar Singh, Sanjoy Saha, Jauhar Ali
Summary: The underground reserve has untapped genetic variation yet to be exploited, with potential to increase resource-use efficiency and grain yield in direct-seeded rice. Various root traits play pivotal roles in nutrient and moisture uptake, but roots also face stresses which require adaptation in response. Candidate genes and transporters have been identified and can aid in developing suitable cultivars for direct-seeded rice.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Agriculture, Multidisciplinary
Xin-yu Wang, Le Xu, Xiao-xiao Li, Guo-dong Yang, Fei Wang, Shao-bing Peng
Summary: This study aimed to identify plant traits that achieve high lodging resistance in ultrashort-duration varieties of direct-seeded and double-season rice (DDR). The results showed that reducing plant height can effectively improve lodging resistance in ultrashort-duration DDR varieties.
JOURNAL OF INTEGRATIVE AGRICULTURE
(2022)
Article
Soil Science
Vanderson Modolon Duart, Fernando Jose Garbuio, Eduardo Favero Caires
Summary: This study evaluated the effects of dolomitic lime and phosphogypsum applications on soil chemical attributes, plant nutrition, and grain yield in direct-seeded flooded rice. Liming alleviated topsoil acidity and increased soil pH, while phosphogypsum application increased nutrient availability throughout the soil profile. Overall, phosphogypsum application improved rice yield by 10-11% by increasing SO4-S availability in the soil profile.
SOIL & TILLAGE RESEARCH
(2021)
Article
Agronomy
Hui Li, Longyu Fang, Pingping Yuan, Wei Lu, Wenwu Yang
Summary: This study proposes a device for seedbed clearing and shaping of dry direct-seeded rice in order to remove stones, break soil blocks, level the soil, and form grooves. The overall structure and roller of the device are developed based on theoretical calculations, discrete element modeling (DEM) simulations, and field tests. The optimization parameters combination of the device obtained by simulation experiments ensures stable and reliable performance.
Article
Agriculture, Multidisciplinary
Bhabani Sankar Satapathy, Dibyendu Chatterjee, Sanjoy Saha, Buddhadeb Duary, Teekam Singh
Summary: This study evaluated the effect of weed management practices in the main crop on the growth, yield, and economics of the rice-ratoon rice cropping system. The results showed that weed infestation reduced crop productivity and energy use efficiency. However, all weed control practices improved system productivity and nutrient uptake.
JOURNAL OF AGRICULTURAL SCIENCE
(2022)
Article
Plant Sciences
Xin Xu, Lixin Zhang, Xiaoning Cao, Lifeng Liu, Bingjun Jiang, Chunlei Zhang, Hongchang Jia, Xiangguang Lyu, Yumei Su, Yupeng Cai, Luping Liu, Shengrui Zhang, Fulu Chen, Cunxiang Wu, Bin Liu, Wensheng Hou, Shi Sun, Jinsheng Lai, Tianfu Han
Summary: Soybean, a short-day plant, utilizes cotyledons to accelerate flowering by perceiving photoperiod and upregulating the flowering promoting gene GmFT2a. Cotyledons can support the entire life cycle and play a substantial role in the flowering process, proposing a new 'cotyledon-based self-reliance' model for rapid flowering in soybeans and other dicots grown in long-day environments at high latitudes.
PLANT CELL AND ENVIRONMENT
(2021)
Article
Agronomy
Jinyu Tian, Shaoping Li, Zhipeng Xing, Shuang Cheng, Qiuyuan Liu, Lei Zhou, Ping Liao, Yajie Hu, Baowei Guo, Haiyan Wei, Hongcheng Zhang
Summary: This study investigated the effects of wheat straw returning on MS-DDSR and found that it reduced yield and biomass accumulation, which could be compensated for by early nitrogen application.
Article
Biotechnology & Applied Microbiology
Guillaume Menard, Nitika Sandhu, Daniel Anderson, Margaret Catolos, Kirsty L. Hassall, Peter J. Eastmond, Arvind Kumar, Smita Kurup
Summary: Seedling vigour is an important agronomic trait in Asian rice, and its genetic control under dry direct seeded conditions has been studied using multiple seedling traits measured in both laboratory and field settings. A genome wide association study revealed that key QTLs for mesocotyl length, seedling emergence rate, and shoot biomass are located on chromosome 7, providing potential haplotypes for predicting seedling vigour in rice accessions. This research could be valuable for genomics-assisted breeding programs in rice.
Article
Microbiology
Siyu Chen, Renliu Qin, Da Yang, Wenjun Liu, Shangdong Yang
Summary: An analysis on rhizospheric and endophytic bacteria and soil fertility in early and late-maturing pumpkin varieties showed that early maturing varieties have higher nitrogen and abscisic acid content, as well as more gibberellin-producing bacteria in their rhizospheres or endophytes. Greater soil fertility and more abundant rhizospheric and endophytic bacterial genera with a greater metabolic function might be important mechanisms for early ripening.
Article
Agronomy
Xiaoxia Ling, Shen Yuan, Shaobing Peng, Tao Li
Summary: This study evaluated the transferability and predictability of ORYZA model in estimating crop yields among different rice cropping systems, finding that crop parameters calibrated for the direct-seeded rice system can be satisfactorily applied to the transplanted system, but modifications are needed for parameters calibrated for the transplanted system to accurately predict in the direct-seeded system.
Article
Plant Sciences
Annamalai Anandan, Siddharth Panda, S. Sabarinathan, Anthony J. Travis, Gareth J. Norton, Adam H. Price
Summary: The study highlights the advantages of the direct seeded rice (DSR) system in terms of saving freshwater resources, reducing labor requirements, and increasing productivity and resource use efficiency, while reducing greenhouse gas emissions. Early root vigor is crucial for ensuring good crop growth, water and nutrient uptake, and weed competition in the DSR system. Genome-wide association studies identified genetic regions and candidate genes related to root architecture and nutrient acquisition. Additionally, a new QTL controlling root length at 14 days was discovered.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Agricultural Economics & Policy
Valerien O. Pede, Francisco J. Areal, Alphonse Singbo, Justin McKinley, Kei Kajisa
AGRICULTURAL ECONOMICS
(2018)
Article
Agricultural Economics & Policy
Kei Kajisa, N. Venkatesa Palanichamy
AGRICULTURAL ECONOMICS
(2011)
Article
Environmental Sciences
Murali Krishna Gumma, Kei Kajisa, Irshad A. Mohammed, Anthony M. Whitbread, Andrew Nelson, Arnel Rala, K. Palanisami
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2015)
Article
Agricultural Economics & Policy
Kei Kajisa, Ellen Payongayong
Article
Water Resources
Kei Kajisa
Article
Green & Sustainable Science & Technology
Yuki Higuchi, Nobuhiko Fuwa, Kei Kajisa, Takahiro Sato, Yasuyuki Sawada
Article
Business, Finance
Kei Kajisa, Bin Dong
WORLD BANK ECONOMIC REVIEW
(2017)
Article
Economics
Takuji W. Tsusaka, Kei Kajisa, Valerien O. Pede, Keitaro Aoyagi
JOURNAL OF ECONOMIC BEHAVIOR & ORGANIZATION
(2015)
Article
Development Studies
Kei Kajisa, N. Venkatesa Palanichamy
Article
Area Studies
Kei Kajisa
ECONOMIC DEVELOPMENT AND CULTURAL CHANGE
(2007)
Article
Agricultural Economics & Policy
Kei Kajisa, K. Palanisami, Takeshi Sakurai
AGRICULTURAL ECONOMICS
(2007)
Article
Agricultural Economics & Policy
Kei Kajisa, N. Venkatesa Palanichamy
AGRICULTURAL ECONOMICS
(2006)
Article
Development Studies
Tran Thi Ut, Kei Kajisa
DEVELOPING ECONOMIES
(2006)
Article
Economics
K Kajisa, T Sakurai
ENVIRONMENT AND DEVELOPMENT ECONOMICS
(2005)