【作者】 焦航宇；

【导师】 汪世华；

【作者基本信息】 福建农林大学 ， 发育生物学， 2010， 硕士

【摘要】 水稻不仅是重要的粮食作物,还是单子叶植物中的模式植物。因此对水稻功能基因组的研究不仅关乎人们的吃饭问题,还能揭示植物发育的机理。在水稻中得到的一些研究成果可以直接或间接的应用到其他植物的研究中去。花器官的正常发育是植物赖以繁衍的基础。在水稻中,颖壳的发育决定了谷粒的大小和形状,而颖壳的颜色和形状也是鉴定水稻品种和稻米品质的一个重要标准。有关花色苷积累的研究己经超过了半个世纪。目前了解到花色苷的合成与积累受到大量结构基因与调节基因的控制,其中一些主控基因的突变会造成颖壳、果皮等表现出红、褐、紫等颜色。花色苷是类黄酮类色素,在植物体中类黄酮在增强植物抗逆性方面起着重要的作用。因此,研究花色苷的合成和沉积,对水稻品质改良和抗逆性提高具有重要的意义。转录因子,是一类能与真核生物基因启动子区域中的顺式作用元件发生特异性相互作用的DNA结合蛋白,通过自身或与其它蛋白间的相互作用,激活或抑制转录。转录因子的失活往往会引起一系列基因表达量的改变,从而引起较明显的表型。与花色苷合成有关的转录因子主要有有MYB类和Zinc-finger类等。我们通过EMS诱变粳稻品种日本晴,得到锈颖突变体rh1。本研究对该突变体进行了遗传分析以及基因定位,主要结果如下。通过对水稻rh1突变体的形态观察发现,突变体呈披叶状,颖壳在灌浆期开始出现锈色斑点,成熟后整个颖壳呈锈色;突变体的叶子失水很快,叶子从植株上取下后很快卷缩。通过对rh1与9311、TN1、和ZF802的杂交后代F1及F2的分析表明RH1基因是一对单隐性的核基因。利用图位克隆技术,我们将RH1基因锁定在第2号染色体上256.54kb的范围内。在NCBI(http://www.ncbi.nlm.nih.gov)上对该段DNA进行预测发现有23个基因。对这23个基因在NCBI上进行功能分析,寻找可能与花色苷代谢有关的基因,其中9个基因可能与突变体表型有关。我们对这9基因进行测序,发现一个编码Zinc-finger结构域的基因在编码区缺失了一个碱基,我们推测该基因可能就是RH1。更多还原

【Abstract】 Rice is not only the main food crop, but also the model plant of monocotyledonous investigation. The research of rice functional genomes is not only related about people’s food, but also a great impulse on the realization of plant development mechanisms.The natural development of flowers is the base of breeding. In rice, the size and shape of grain is decided by the development of hull. The accumulation of anthocyanin in some organizations had been studied for more than fifty years.The shape and color of hull is a important criterion to evaluate rice character and breed.They have been controlled by some construction genes and regulator genes. Any change of the key genes can cause hull and pericarp shift their colors. Anthocyanin is one of major class of flavonoids, which plays an important role in plant development, in the protection against UV radiation, attraction of insects for pollination and plant defense response.Thereby, the synthesis and accumulation of anthocyanin play an important role in rice character and quality improvement. Transcription factor are proteins, which can activate or inactivate the expression of gene by binding to gene’s promoter region. The deactivation of transcriptions factor can change expression of a series of gene. Transcriptions factors relate to anthocyanin synthesize are MYB class and Zinc-finger class. We had found a rh1 from Nippobare (O. sativa ssp.joponica) mutant date. In this study, the genetics analysis and mapping were done. The main results are as follows.The leaf of rh1 mutant is sagged. Brown pigment start to accumulate as a ppoint under the hull and with seed maturing, it diffuses lowly and reach a maximum level when seed matured. The leaf of rh1 dehydrate quickly. When cut from the whole plant, it curls in a minute. The F1 and F2 progenies from the crosses between rh1 and any of 9311,TN1 and ZF802 were investigated. The result is that, the phenotype of rh1 is controlled by a pair of recessive genes.The mutant trait was mapped by Map-based colning and delimited in the 256.546kb region on the chromosome 2. Here are 23 open reading frames (ORF) within this region (http://www.ncbi.nlm.nih.gov). We predicted the functions of the 23 genes online .Search genes are likely relateded to anthocyanin accumulation. At last, 9 genes were selected. Within the 9 genes, we found one gene which encode a Znic-finger likely domain, lose one base. We infered it is RH1 gene.更多还原