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红莲型水稻atp6-orfH79基因的转录加工及其育性恢复相关基因的功能研究
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摘要
细胞质雄性不育水稻根据遗传和细胞学特征分为野败(WA)、红莲(HL)和包台(BT)三大类型,其中红莲型水稻是武汉大学在上世纪70年代选育的配子体细胞质雄性不育类型,目前在生产上得到了大面积推广与应用。本论文对红莲型水稻细胞质雄性不育和育性恢复的分子机理进行了一些探索,获得以下研究结果:
     1.采用Northern blot、引物延伸、CR-RT-PCR和RACE的方法,我们系统地对红莲型CMS水稻不育系及其杂种F1代线粒体中不育相关基因的转录和转录后水平进行了细致的分析。并基于这些分子水平的结果将CMS红莲型和包台型水稻做了全面的比较分析。发现两者的不育相关区域atp6-orfH79和atp6-orf79,在不育系中的转录模式和杂种中恢复基因的加工位点等方面存在一些明显的差异:(1)对HL型CMS水稻的不育系不育相关区域的分析表明atp6-orfH79的基因间区域存在转录启动子。转录起始位点位于1117和1124,转录本长度分别为483bp和476bp。密度梯度离心实验证实这些新的转录本可能与核糖体共分离,推测其具有翻译能力。(2)对HL型CMS水稻杂种F1代(9311为父本)的分析表明9311中的恢复基因在atp6-orfH79共转录本上的加工位点有三个,其中一个位于atp6上游-11--13位,另外两个位于基因间区域的1132和1170位。(3)对33个含有atp6-orfH79同源片段的水稻基因型的聚类分析表明(基于非编码的基因间区序列比对),atp6-orfH79和atp6-orfH79分属两大类。
     2.为了深入研究红莲型水稻不育和育性恢复的分子机理,我们构建了红莲型水稻杂种F1的幼穗细菌双杂交系统文库。用Trizol试剂提取红莲型水稻杂种F1幼穗的总RNA,分离纯化mRNA后反转录并合成双链cDNA。经sephrose CL-2B凝胶过滤柱层析后,收集大于400 bp以上的双链cDNA片段,将其连接到pTRG载体上,转化到XL1-Blue MRF'Kan感受态细胞后构建成红莲水稻幼穗细菌双杂交文库。经检测计算该原始文库容量为1.03×106pfu/mL,对随机挑取的100个克隆进行PCR鉴定,显示重组率接近100%,而且大于800 bp的插入片段达到97%。扩增后文库的容量达到1.05×1010pfu/mL。
     3.一些研究报道认为CMS的恢复基因可能是以复合体的形式发挥加工转录本的功能。为了搞清楚红莲型CMS恢复基因Rf5的恢复机理,我们对细菌双杂交文库淘洗的RF5可能的互作蛋白之一的GRP蛋白进行了详细的分析。(1)原核表达并纯化了RF5和GRP重组蛋白,并分别用圆二色谱对其二级结构进行分析,证明表达的重组蛋白具有典型的PPR和RRM基序所具有的二级结构特征。(2)凝胶阻滞和SPR(表面等离子共振)实验证明GRP蛋白能够与H-atp6的基因间区域的RNA相互作用而且分析了GRP蛋白与靶标RNA的结合常数等参数。酵母三杂交实验进一步将GRP与RNA的相互作用确定在两个较小的区段。
The CMS rice generally could be categorized into three types, namely, WA-type, Honglian(HL)-type and BT-type. The HL-type CMS rice was discovered in the last century's 70s by Wuhan University. Currently, it had been promoted and applied to large cultivated area of hybrid rice. The molecular mechanisms for CMS and fertility restoration of Honglian CMS system were performed in this paper. The results were shown as follow.
     1. With Northern blot, primer extension, CR-RT-PCR and RACE methods, a detailed analysis was made about CMS associated gene of HL-type rice sterility line Yuetai A(YTA) and hybrid F1 Honglian you-6(HL-6) on transcriptional and post-transcriptional level. Based on this, a comparative study between HL-type and BT-type at the molecular level was done. From the results, some similarities were found. However, there did exist some mentionable differences in transcription mode of CMS associated gene in sterility line and cleavage sites functioned by restorer gene in hybrid F1 between BT-type and HL-type CMS rice. Main results are as follows: (1) Transcript initiation sites 1117 and 1124 in the intergenic region of H-atp6 were found, the length of novel transcripts were 483 and 476 bp. Density gradient centrifugation assay verified that the 483 and 476 bp of transcipts would be associated with polysome, which implied that the novel transcripts possessed the ability of translation. (2) There might be 3 of cleavage sites on the atp6-orfH79 transcript by the restorer gene(s) in 9311. one was at the-11--13 bp upstream of atp6, the other two were at 1132 and 1170 of the intergenic region of atp6-orfH79 transcript.(3) a phylogenetic research was carried through based on DNA sequences of intergenic region of CMS associated gene among 33 rice accessions with orfH79, the results showed that the B-atp6 and H-atp6 respectively belonged to different subgroups.
     2. In order to study the molecular mechanism of sterility and fertility restoration in Honglian CMS rice, the total RNA was extracted from the Young Panicle of F1 hybrid rice by Trizol reagent. The mRNA was purified from total RNA by Poly-A Tract mRNA Isolation Kit and the double-stranded(ds) cDNA was synthesized after reverse transcription. The fragments longer than 400 bp in length were fractionated by Sephrose CL-2B Column, and then ligated into the pTRG vertor. The ligation product was transformed into XL 1-Blue MRF'Kan Library Pack Competent Cells to construct the bacterial Two-Hybrid system library. Analysis showed that the primary library contained 1.03×106 pfu/mL, and approximately 100% of the clones were positive recombinants and about 97% of the cDNA fragments inserted were longer than 800 bp in length. The capacity of the amplified library was 2.14×1012 pfu/mL.
     3. Many researchers thought that the restorer gene(s) play their function of processing transcript in the form of complex. For clarifying the mechanism of fertility restoration by restorer gene Rf5 in CMS-HL rice, we conducted a detailed analysis on the RF5 and GRP protein which was a candidate interactor with RF5. The main findings were as follows:(1) Recombinant protein of RF5 and GRP were expressed and purified in E. coli. The secondary structure of these two proteins were analyed by circular dichroism and the results showed that the secondary structures predicted by CD matched the characteristic of PPR and RRM motif. (2) The qualitative and quantitative interaction between GRP and the intergenic RNA of H-atp6 in vitro was acquired by gel shift and SPR assays. Furthermore, the more precise bind region in two small sections was identified by yeast three hybrid assay.
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