Expression Profiling and Functional Characterization of Rice Transcription Factor OsWRKY68
CHEN Yue, WANG TianXingZi, YANG Shuo, ZHANG Tong, MA JinJiao, YAN GaoWei, LIU YuQing, ZHOU Yan, SHI JiaNan, LAN JinPing, WEI Jian, DOU ShiJuan, LIU LiJuan, YANG Ming, LI LiYun, LIU GuoZhen,College of Life Sciences, Hebei Agricultural University, Baoding 071001, Hebei
Abstract 【Objective】 There are nearly 100 WRKY transcription factor members in rice genome, many of them are involved in plant growth and development, biotic and abiotic stress responses. Molecular biology & bioinformatics lab identified that the expression of OsWRKY68 protein was induced after inoculation with Xanthomonas oryzae pv. oryzae (Xoo) in rice. The aim of this study is attempt to further explore the function of OsWRKY68. 【Method】Rice TP309 samples of different tissues at different developmental stages, including germination, seedling, tillering, booting and flowering stages of root, stem, leaf, sheath, cushion, panicle, anther, husk, seed, abiotic stress (4℃, 44℃, 48℃, submerge, NaCl, PEG, constant light, constant dark) and hormone treatments (abscisic acid, methyl jasmonate, salicylic acid, ethephon) were collected. Total protein were extracted and analyzed by Western blot (WB) systematically using OsWRKY68-specific antibody. The expression patterns of OsWRKY68 protein isolated from different tissues at different developmental stages, and tissues obtained from abiotic stresses and hormone treatments were investigated. RNA interfering vector was constructed and transformed to wildtype TP309 rice variety via Agrobacterium tumefaciens strategy. Identification of transgenic plants were carried out by PCR and WB. The phenotype of OsWRKY68 RNAi transgenic plants were monitored and plant height, tiller number, spike length, spikelet number and seed-setting rate were measured.【Result】By comparing the abundance of OsWRKY68 protein in different tissues, it was found that OsWRKY68 protein was expressed in a constitutive way during the normal growth and development of rice, the abundance of OsWRKY68 protein expressed among different tissues were not varied too much. However, different levels of OsWRKY68 were observed. The expression level of OsWRKY68 in anthers at flowering stage was higher than that in mature panicles, panicle axis and husk. It was not expressed in sheaths at tillering and booting stages, but it was expressed in sheaths at flowering stage. In panicles, the abundance of OsWRKY68 was decreased gradually along with the growth of the young panicle. By investigating the expression patterns of OsWRKY68 protein under abiotic stress and hormone treatments, it was found that the abundance of OsWRKY68 protein decreased steadily under salt stress. The expression of OsWRKY68 protein increased steadily at constant light treatment, a specific band (designated as OsWRKY68 +) with higher molecular weight appeared at three days and enhanced in the following timepoints. After methyl jasmonate (MeJA) and ethephon (ET) treatments, OsWRKY68 + band appeared also and its intensity increased as the treatments continues. Four homozygous OsWRKY68 RNAi transgenic lines (Y316, Y317, Y326 and Y337) were checked by PCR and WB analyses and verified at T3 generation. The abundance of OsWRKY68 protein in RNAi transgenic plants was lower than that in wildtype TP309. Phenotypic investigation revealed significant reduction in plant height, tiller number and seed setting rate in transgenic plants.【Conclusion】Rice OsWRKY68 protein plays an important role in the process of normal growth and development of rice. Knocking down the abundance of OsWRKY68 protein via RNAi affected the normal growth of rice. In addition, the data of expression patterns suggested that the function of OsWRKY68 protein may be involved with salt stress, light, MeJA and ethene-mediated signal transduction pathways. Keywords:rice;WRKY transcription factor;expression patterns;western blot;RNA interference
PDF (1035KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 陈悦, 王田幸子, 杨烁, 张彤, 马金姣, 燕高伟, 刘玉晴, 周艳, 史佳楠, 兰金苹, 魏健, 窦世娟, 刘丽娟, 杨明, 李莉云, 刘国振. 水稻转录因子OsWRKY68蛋白质的表达特征及其功能特性[J]. 中国农业科学, 2019, 52(12): 2021-2032 doi:10.3864/j.issn.0578-1752.2019.12.001 CHEN Yue, WANG TianXingZi, YANG Shuo, ZHANG Tong, MA JinJiao, YAN GaoWei, LIU YuQing, ZHOU Yan, SHI JiaNan, LAN JinPing, WEI Jian, DOU ShiJuan, LIU LiJuan, YANG Ming, LI LiYun, LIU GuoZhen. Expression Profiling and Functional Characterization of Rice Transcription Factor OsWRKY68[J]. Scientia Acricultura Sinica, 2019, 52(12): 2021-2032 doi:10.3864/j.issn.0578-1752.2019.12.001
pTCK303和pCAMBIA2300质粒由中国科学院遗传与发育生物学研究所江光怀博士提供。pEASY-T1质粒购自生工生物工程(上海)股份有限公司。含有水稻OsWRKY68全长的cDNA质粒AK072938(Os04g51560)购自日本农业生物资源研究所水稻基因组资源中心(Rice Genome Resource Center,National Institute of Agrobiological Sciences)。
WB条件:上样量10 μL,电泳条件:80 V,20 min;160 V,90 min,胶浓度10% tricine,电泳槽Mini PROTEAN Tetra cell,转膜条件:100 V,60 min,膜PVDF,一抗:抗OsWRKY68抗体,抗OsHSP82抗体,二抗:羊抗兔二抗,羊抗鼠二抗。HSP:水稻HSP82;WRKY68:水稻OsWRKY68。下同。An:花药;Bt:孕穗期;Fw:开花期;Husk:颖壳;Low:叶片下部;Mid:叶片中部;MP:成熟穗;PA:穗轴;Rt:幼根;Ti:分蘖期;Up:叶片上部 Fig. 1Expression profiling of OsWRKY68 protein in different tissues at different developmental stages
WB conditions: Sample loading volume 10 μL. Electrophoresis: 80 V, 20 min, 160 V, 90 min, Gel concentration 10% tricine. Electrophoresis apparatus Mini PROTEAN Tetra cell. Membrane (PVDF) transfer: 100 V, 60 min, Primary Antibody: anti-OsWRKY68 polyclonal antibody (BPI, AbP80049-A-S), anti-HSP82 monoclonal antibody (BPI, AbM51099-31-PU), Secondary antibody: goat anti-rabbit secondary antibody (BPI, AbP-71001-D-HRP), goat anti-mouse secondary antibody (BPI, AbP-71003-D-HRP). HSP: Rice OsHSP82; WRKY68: Rice OsWRKY68. The same as below. An: Anther; Bt: Booting; Fw: Flowering; Low: Lower part of leave; Mid: Middle part of leave; MP: Mature panicle; PA: Panicle axis; Rt: Root; Ti: Tillering; Up: Upper part of leave
A:OsWRKY68蛋白质在水稻苗期NaCl(200 mmol·L-1)处理下的表达特征;B:OsWRKY68蛋白质在水稻离体叶片恒光处理下的表达特征。CK:对照;CL:恒光处理 Fig. 2Expression profiling of OsWRKY68 protein under abiotic stresses
A: Expression profiling of rice OsWRKY68 protein at seedling stage under 200 mmol·L-1 NaCl treatment; B: Expression profiling of rice OsWRKY68 protein under constant light in vitro. CK: Control; CL: Constant light
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