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Jiayan Liang, Shaoying Guo, Bo Sun, Qing Liu, Xionghui Chen, Haifeng Peng, Zemin Zhang, Qingjun Xie
Leaf rolling is one of the most significant symptoms of drought stress in plant. Previously, we identified a dominant negative mutant, termed rolled and erect 1 (hereafter referred to rel1-D), regulating leaf rolling and erectness in rice. However, the role of REL1 in drought response is still poorly understood. Here, our results indicated that rel1-D displayed higher tolerance to drought relative to wild type, and the activity of superoxide dismutase (SOD) and drought responsive genes were significantly up-regulated in rel1-D...
October 25, 2018: Rice
Zhenyi Chang, Mingna Jin, Wei Yan, Hui Chen, Shijun Qiu, Shan Fu, Jixing Xia, Yuchen Liu, Zhufeng Chen, Jianxin Wu, Xiaoyan Tang
BACKGROUND: The pollen wall, which protects male gametophyte against various stresses and facilitates pollination, is essential for successful reproduction in flowering plants. The pollen wall consists of gametophyte-derived intine and sporophyte-derived exine. From outside to inside of exine are tectum, bacula, nexine I and nexine II layers. How these structural layers are formed has been under extensive studies, but the molecular mechanisms remain obscure. RESULTS: Here we identified two osabcg3 allelic mutants and demonstrated that OsABCG3 was required for pollen development in rice...
October 11, 2018: Rice
Laurent Sagart, Tze-Fu Hsu, Yuan-Ching Tsai, Cheng-Chieh Wu, Lin-Tzu Huang, Yu-Chi Chen, Yi-Fang Chen, Yu-Chien Tseng, Hung-Ying Lin, Yue-Ie Caroline Hsing
BACKGROUND: Genetic data for traditional Taiwanese (Formosan) agriculture is essential for tracing the origins on the East Asian mainland of the Austronesian language family, whose homeland is generally placed in Taiwan. Three main models for the origins of the Taiwanese Neolithic have been proposed: origins in coastal north China (Shandong); in coastal central China (Yangtze Valley), and in coastal south China. A combination of linguistic and agricultural evidence helps resolve this controversial issue...
October 11, 2018: Rice
Rosa Paula O Cuevas, Cyril John Domingo, Nese Sreenivasulu
BACKGROUND: For predicting texture suited for South and South East Asia, most of the breeding programs tend to focus on developing rice varieties with intermediate to high amylose content in indica subspecies. However, varieties within the high amylose content class may still be distinguishable by consumers, who are able to distinguish texture that cannot be differentiated by proxy cooking quality indicators. RESULTS: This study explored a suite of assays to capture viscosity, rheometric, and mechanical texture parameters for characterising cooked rice texture in a set of 211 rice accessions from a diversity panel and employed multivariate approaches to classify rice varieties into distinct cooking quality classes...
October 10, 2018: Rice
Jie Hu, Xingyuan Chang, Ling Zou, Weiqi Tang, Weiren Wu
BACKGROUND: Host-plant resistance is the most desirable and economic way to overcome BPH damage to rice. As single-gene resistance is easily lost due to the evolution of new BPH biotypes, it is urgent to explore and identify new BPH resistance genes. RESULTS: In this study, using F2:3 populations and near-isogenic lines (NILs) derived from crosses between two BPH-resistant Sri Lankan rice cultivars (KOLAYAL and POLIYAL) and a BPH-susceptible cultivar 9311, a new resistance gene Bph33 was fine mapped to a 60-kb region ranging 0...
October 5, 2018: Rice
Zhiming Yu, Lixiang Dong, Zhifang Jiang, Keke Yi, Jianhua Zhang, Zhongchen Zhang, Zhenxing Zhu, Yuhuan Wu, Maojun Xu, Jun Ni
The mechanisms of plant defense against pathogen attack in plant leaves have been extensively studied. However, our understanding of plant defense mechanisms in plant roots is still limited. In this study, a semi-dominant mutant nrtp1-D (necrotic root tip 1), with a short-root phenotype, was characterized in rice. Map-based cloning revealed that NRTP1 encoded a typical coiled-coil nucleotide binding leucine rich repeat (CC-NB-LRR) type protein and the mutation caused an amino acid substitution in the Nucleotide-Binding adaptor shared by Apaf1, certain R genes and CED4 (NB-ARC) domain, which may cause constitutive auto-activation of the NRTP1 protein...
October 3, 2018: Rice
Satoshi Okada, Megumi Sasaki, Masanori Yamasaki
BACKGROUND: The improvement of rice yield is a crucial global issue, but evaluating yield requires substantial efforts. Rice yield comprises the following indices: panicle number (PN), grain number per panicle (GN), 1000-grain weight, and percentage of ripened grain. To simplify measurements, we analyzed one panicle weight (OPW) as a simplified yield index that integrates GN, grain weight, and percentage of ripened grain, and verified its suitability as a proxy for GN and grain weight in particular...
September 17, 2018: Rice
Weiwen Kong, Li Ding, Jia Cheng, Bin Wang
BACKGROUND: Complex co-regulatory networks in plants may elicit responses during pathogen infections. A number of genes are activated when these responses take place. Identification of these genes would shed new light on understanding the mechanisms of rice response to pathogen infections and the elucidation of crosstalk among diverse signaling networks in rice disease resistance/susceptibility. RESULTS: Here we report the identification of genes with pathogen-inducible cis-regulatory elements (PICEs) (AS-1, G-box, GCC-box, and H-box) in the promoter regions in rice...
September 12, 2018: Rice
Weihuai Pan, Jinqiu Shen, Zhongzhong Zheng, Xu Yan, Jianxin Shou, Wenxiang Wang, Lixi Jiang, Jianwei Pan
BACKGROUND: The calcineurin B-like protein (CBL) and CBL-interacting protein kinase (CIPK) signaling system plays a key regulatory role in plant stress signaling. The roles of plant-specific CIPKs, essential for CBL-CIPK functions, in the response to various abiotic stresses have been extensively studied so far. However, until now, the possible roles of the CIPKs in the plant response to heavy metal toxicities are largely unknown. RESULTS: In this study, we used bioinformatic and molecular strategies to isolate 12 HsCIPK genes in Tibetan Plateau annual wild barley (Hordeum spontaneum C...
September 12, 2018: Rice
Hung-Chi Chen, Wan-Hsing Cheng, Chwan-Yang Hong, Yu-Sen Chang, Men-Chi Chang
BACKGROUND: Many transcription factors (TFs), such as those in the basic helix-loop-helix (bHLH) family, are important for regulating plant growth and plant responses to abiotic stress. The expression of OsbHLH035 is induced by drought and salinity. However, its functional role in rice growth, development, and the salt response is still unknown. RESULTS: The bHLH TF OsbHLH035 is a salt-induced gene that is primarily expressed in germinating seeds and seedlings. Stable expression of GFP-fused OsbHLH035 in rice transgenic plants revealed that this protein is predominantly localized to the nucleus...
September 10, 2018: Rice
Feng He, Fan Zhang, Wenxian Sun, Yuese Ning, Guo-Liang Wang
The caption of Fig. 5 and the figure contained an error [1]. The updated figure and caption are published in this correction article.
September 7, 2018: Rice
Sunok Moon, Anil Kumar Nalini Chandran, Gynheung An, Chanhui Lee, Ki-Hong Jung
BACKGROUND: Root hairs are valuable in taking up nutrients and water from the rhizosphere and serving as sites of interactions with soil microorganisms. By increasing the external surface area of the roots or interacting with rhizobacteria, root hairs directly and indirectly promote plant growth and yield. Transcriptome data can be used to understand root-hair development in rice. RESULT: We performed Agilent 44 K microarray experiments with enriched root-hair samples and identified 409 root hair-preferential genes in rice...
August 29, 2018: Rice
Dagang Tian, Liu Yang, Zaijie Chen, Ziqiang Chen, Feng Wang, Yuanchang Zhou, Yuming Luo, Liming Yang, Songbiao Chen
BACKGROUND: Rice blast (caused by Magnaporthe oryzae) is one of the most destructive diseases of rice. While many blast resistance (R) genes have been identified and deployed in rice cultivars, little is known about the R gene-mediated defense mechanism. We used a rice transgenic line harboring the resistance gene Piz-t to investigate the R gene-mediated resistance response to infection. RESULTS: We conducted comparative proteome profiling of the Piz-t transgenic Nipponbare line (NPB-Piz-t) and wild-type Nipponbare (NPB) inoculated with M...
August 15, 2018: Rice
X Liu, C Y Yang, R Miao, C L Zhou, P H Cao, J Lan, X J Zhu, C L Mou, Y S Huang, S J Liu, Y L Tian, T L Nguyen, L Jiang, J M Wan
BACKGROUND: Plant height and leaf angle are important determinants of yield in rice (Oryza sativa L.). Genes involved in regulating plant height and leaf angle were identified in previous studies; however, there are many remaining unknown factors that affect rice architecture. RESULTS: In this study, we characterized a dwarf mutant named ds1 with small grain size and decreased leaf angle,selected from an irradiated population of ssp. japonica variety Nanjing35. The ds1 mutant also showed abnormal floral organs...
August 6, 2018: Rice
Dongping Zhang, Yuzhu Wang, Jinyu Shen, Jianfeng Yin, Dahong Li, Yan Gao, Weifeng Xu, Jiansheng Liang
The receptor for activated C kinase 1 (RACK1) is a WD40 type protein that is involved in multiple signaling pathways and is conserved from prokaryotes to eukaryotes. Here we report that rice RACK1A (OsRACK1A) is regulated by circadian clocks and plays an important role in the salt stress response. OsRACK1A was found to follow a rhythmic expression profile under circadian conditions at both the transcription and the translation levels, although the expression was arrhythmic under salt stress. Analysis of plant survival rates, fresh weight, proline content, malondialdehyde, and chlorophyll showed that suppression of OsRACK1A enhanced tolerance to salt stress...
August 2, 2018: Rice
Qing Dong, Zhen-Hua Zhang, Lin-Lin Wang, Yu-Jun Zhu, Ye-Yang Fan, Tong-Min Mou, Liang-Yong Ma, Jie-Yun Zhuang
BACKGROUND: Grain size is a key determinant of grain weight and a trait having critical influence on grain quality in rice. While increasing evidences are shown for the importance of minor-effect QTL in controlling complex traits, the attention has not been given to grain size until recently. In previous studies, five QTL having small effects for grain size were resolved on the long arm of chromosome 1 using populations derived from indica rice cross Zhenshan 97///Zhenshan 97//Zhenshan 97/Milyang 46...
August 2, 2018: Rice
Alexandre Grondin, Shalabh Dixit, Rolando Torres, Challa Venkateshwarlu, Eric Rogers, Thomas Mitchell-Olds, Philip N Benfey, Arvind Kumar, Amelia Henry
BACKGROUND: Traditional rice (Oryza sativa) varieties are valuable resources for the improvement of drought resistance. qDTY3.2 is a drought-yield quantitative trait locus that was identified in a population derived from the traditional variety Moroberekan and the drought-susceptible variety Swarna. In this study, our aim was to characterize the physiological mechanisms associated with qDTY3.2 . Our approach was to phenotype fifteen BC2 F3:4 lines for shoot and root drought resistance-related traits as compared to Swarna in the field under well-watered and drought stress conditions...
July 31, 2018: Rice
Jiaqing Huang, Huili Liu, Thomas Berberich, Yuting Liu, Li-Zhen Tao, Taibo Liu
BACKGROUND: RAC/ROP GTPase are versatile signaling molecules controlling diverse biological processes including cell polarity establishment, cell growth, morphogenesis, hormone responses and many other cellular processes in plants. The activities of ROPs are positively regulated by guanine nucleotide exchange factors (GEFs). Evidence suggests that RopGEFs regulate polar auxin transport and polar growth in pollen tube in Arabidopsis thaliana. However, the biological functions of rice RopGEFs during plant development remain largely unknown...
July 30, 2018: Rice
Xiaoming Yang, Yulong Ren, Yue Cai, Mei Niu, Zhiming Feng, Ruonan Jing, Changling Mou, Xi Liu, Lianjie Xiao, Xin Zhang, Fuqing Wu, Xiuping Guo, Ling Jiang, Jianmin Wan
BACKGROUND: Grain size, which is determined by grain length, grain width, and grain thickness, is an important determinant for grain yield in rice. Identification and characterization of new genes that are associated with grain size will be helpful for the improvement of grain yield in rice. RESULTS: We characterized the grain size mutant, larger grain size 1 (lgs1), derived from rice activation-tagged T-DNA insertion lines. Histological analysis showed that increased cell numbers in the longitudinal direction of spikelet hulls was responsible for the grain mutant phenotype in lgs1...
July 20, 2018: Rice
Dhanasekar Divya, Kanaparthi Ratna Madhavi, Muralidharan Ayyappa Dass, Roshan Venkata Maku, Garladinne Mallikarjuna, Raman Meenakshi Sundaram, Gouri Sankar Laha, Ayyagari Phani Padmakumari, Hitendra Kumar Patel, Madamsetty Srinivas Prasad, Ramesh Venkata Sonti, Jagadish Sanmallappa Bentur
BACKGROUND: Rice, a major food crop of the world, endures many major biotic stresses like bacterial blight (BB), fungal blast (BL) and the insect Asian rice gall midge (GM) that cause significant yield losses. Progress in tagging, mapping and cloning of several resistance (R) genes against aforesaid stresses has led to marker assisted multigene introgression into elite cultivars for multiple and durable resistance. However, no detailed study has been made on possible interactions among these genes when expressed simultaneously under combined stresses...
July 13, 2018: Rice
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