玉米低磷应答转录因子ZmPHR1的克隆及功能分析
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摘要
玉米(Zea mays L.)是世界上重要的粮食、经济和饲料兼用型作物。大部分玉米种植于热带和温带的酸性或碱性土壤中,而磷素作为植物重要的营养元素之一极易被酸性土壤中的Fe3+、Al3+以及碱性土壤中的Ca2+结合形成难溶性化合物,导致土壤中有效磷缺乏,最终严重影响玉米的产量和品质。尽管磷肥的施用能够缓解土壤中有效磷缺乏的问题,但是随之而来的是引起更多磷素在土壤中被固定、流失、水体富营养化以及磷矿资源的缺乏等一系列问题。研究表明,只有极少数玉米自交系属磷高效利用型。所以,培育低磷条件下的磷高效利用型玉米种质为育种所用,是我们迫切需要解决的问题。磷的利用效率是一个受多基因控制的数量性状,导入单个功能基因并不能达到改善某一个数量性状的效果,而单个转录因子的导入可以调控下游多个基因的表达,因此,将转录因子作为研究对象以期提高玉米的磷利用效率。到目前为止,磷利用相关转录因子的研究以拟南芥和水稻中AtPHR1和OsPHR2研究最为详尽,二者都属于MYB-CC转录因子家族,而且在进化上同源,且已被证明是磷饥饿响应的重要调控因子,在植物磷积累调控中起重要作用。然而,在玉米中,尚未有与PHR1类似的转录因子的报道。
     从筛选到的磷高效利用型玉米材料中克隆与AtPHR1同源的基因,并对该基因的序列特征、特性以及功能进行了分析研究。主要结论如下:
     1.对36份玉米材料进行低磷胁迫处理,采用影响磷利用效率的两个关键因素干物质量和磷积累量的绝对值和相对值进行综合评价,并辅助以生理生化特性分析,最终筛选出磷高效利用型玉米材料478和太系113。
     2.以AtPHR1为基础序列,利用序列相似性分析方法,从磷高效利用型玉米材料478中获得一个氨基酸序列。生物信息学分析表明,该序列编码一个含有449个氨基酸的蛋白,与AtPHR1、OsPHR1和OsPHR2的一致性分别为43%、64%和45%:具有与AtPHR1.OsPHR1和OsPHR2一样高度保守的MYB-DNA结合域和CC结构域,属于一个新MYB-CC转录因子家族,命名为ZmPHR1。系统进化树分析表明,2mPHR1与AtPHRl,OsPHR1,OsPHR2同属一个亚类,相比AtPHR1,与OsPHR1、 OsPHR2的亲缘关系更近一些。ZmPHR1基因位于玉米第1条染色体长臂上。基因结构分析表明,ZmPHR1具有7个外显子和6个内含子,与AtPHR1和OsPHR1的基因结构相似。
     3.利用基因枪法将含有ZmPHR1::GFP融合蛋白的植物表达载体导入洋葱表皮细胞。结果表明,仅在核内观察到GFP荧光,说明ZmPHR1在核内表达,为一个MYB-CC转录因子。RT-PCR分析表明,无论高磷还是低磷培养,ZmPHRl在不同组织器官中均有表达,在叶中表达量最高,根中次之,茎中最弱,属组织特异性表达。qPC(?)进一步分析表明,随着磷饥饿处理时间的延长,ZmPHR1的表达量处在一个动态变化中,存在一个正负反馈调节。
     4.通过农杆菌浸染花蕾法将含有ZmPHR1::GFP的植物双元表达载体导入拟南芥,通过潮霉素抗性筛选、DNA-PCR、RT-PCR和GFP检测,获得过量表达的转基因拟南芥株系。
     5.通过对拟南芥ZmPHR1过表达株系和野生型株系的表型对比分析得出,相比野生型株系,ZmPHR1的过量表达明显改善转基因植株的生长。特别是在低磷条件下,相比野生型株系,过表达株系的茎叶干重和无机磷含量均显著提高。
     6.通过对拟南芥磷饥饿响应基因的表达分析得出,在低磷条件下,相比野生型株系,ZmPHR1过表达株系的根和茎叶中的AtIPS1、AtPS2、AtPS3和AtRNS1的表达均上调,并且同时上调了根中磷转运蛋白基因Pht1;2、Pht1;8和Pht1;9的表达,推测这些基因的上调是植株生物量和无机磷含量提高的原因。
Maize (Zea mays L.) is an important food, economic and forage crop in the world. It is grown widely in both acidic and calcareous soils, where inorganic phosphate (Pi) is easily formed insoluble complexes with aluminum and iron in acidic conditions or calcium ions in alkaline soil. Therefore, maize yield and quality is limited by the poor availability of Pi. Although the application of phosphorus (P) fertilizer could alleviate the problem of lack of Pi, a series of attendant problems are caused including phosphorus fixation, erosion in soils, eutrophication of water body and phosphate rock resources shortage. Many researches have showed that there are only a few of maize inbreds with high phosphorus use efficiency (PUE). Producing more maize germplasm with high PUE is an urgent problem to be resolved. PUE is a complex multi-gene trait, with a single gene contributing only a small percentage to the phenotype. A single transcription factor (TF) frequently coordinates the expression of multiple genes in response to environmental signals and regulate polygene quantitative traits. So, TFs would be used to regulate maize PUE. So far, two TFs related to Pi starvation were studied most detailed, which are AtPHRl in Arabidopsis and OsPHR2in rice. They belong to the MYB-CC TF family and are evolutionary homology. Both AtPHRl and OsPHR2were verified to be important regulators for phosphate starvation response and play important roles in the regulation of plant phosphorus accumulation. However, little is known about the functions of PHR-like TFs in maize.
     In this study, a homolog gene sequence of AtPHRl was isolated from an inbred line of maize with high PUE. The charicaterization and functions the gene were studied. The results are summarized as follows:
     1. Thirty-six maize materials were treated by low phosphorus stress. The absolute values and relative values of dry matter amount and phosphorus accumulate amount were used to be an evaluating indicator to screen high PUE genotypes, which are assisted with analysis of physiological-biochemical charicteristic. Two high PUE genotypes478and TX113were obtained.
     2. According to the sequence alignment analysis, a homolog gene sequence of AtPHR1was isolated from an inbred line478of maize with high PUE. Bioinformatics analysis showed that the sequence encodes a449-amino acid protein. Multiple sequence alignment results showed that the predicted amino acids sequence shared43%,64%, and45%identity with the amino acid sequences of AtPHR1, OsPHRl and OsPHR2, respectively. The results also indicated that the four amino acid sequences were highly conserved in both MYB DNA-binding domain (BD) and CC domain. So, the sequence designated as ZmPHRl. Phylogenetic analysis showed that ZmPHRl was clustered in the same group as AtPHRl, OsPHR1and OsPHR2. ZmPHRl was sub-grouped with OsPHR1and OsPHR2, which was consistent with their close evolutionary relationship. ZmPHR1was located on long arm of maize chromosome1. The gene structure of ZmPHR1had a similar splicing pattern as AtPHRl, OsPHRl with seven exons and six introns.
     3. The construct with ZmPHR1::GFP fusion protein was introduced into onion epidermal cells by particle bombardment. The fluorescence signal was located predominately in the nuclei. The results demonstrated that ZmPHR1is a nuclear protein and is a MYB-CC TF.ZmPHR1showed a tissue specificity expression pattern, with the highest expression in leaves, the higher expression in roots and the weakest expression in stems. Further qPCR analysis showed that, ZmPHRl expression of different tissues was in a dynamic change along with the prolonging of phosphate starvation treatment time, and exist a positive and negative feedback to phosphate starvation.
     4. A binary vector containing the ZmPHRl::GFP fusion protein was constructed and introduced into Arabidopsis by floral dip method. The transgenic Arabidopsis lines with overexpressing ZmPHR1were obtained and verified by Hygromycin resistant screening, DNA-PCR, RT-PCR and GFP.
     5. The phenotype of ZmPHRl overexpression lines and wild type (WT) Arabidopsis analysis showed that overexpression of ZmPHRl could significantly improve the growth of transgenic plants. The dry matter yield and Pi content of ZmPHR1-overexpressing lines were much higher than those of WT, especially under LP conditions.
     6. The expression patterns of Pi-starvation-inducible genes were examined in ZmPHR1-overexpressing Arabidopsis plants. Under LP conditions, compared to wild-type plants, expression of AtIPS1, AtPS2, AtPS3and AtRNSl in shoots and roots was up-regulated in ZmPHR1overexpression lines, and Pht1;2、Phtl;8and Phtl;9were also up-regulated in roots. It is inferred that the upregulation of these Pi-starvation-inducible genes could increase the plant biomass and phosphorus content.
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