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| 1 | 草莓miR390基因及其启动子的鉴定与表达分析显示文摘【目的】明确草莓miR390基因的表达特性,为进一步揭示其与草莓白粉病抗性的关系奠定基础。【方法】采用PCR和qRT-PCR的方法,从栽培草莓‘全明星’中克隆了miR390基因及其启动子序列,系统研究了高盐、低温、不同培养方式、IAA处理等对草莓miR390基因表达的影响。【结果】克隆到的418 bp的草莓miR390基因序列中,包含97 bp的茎环结构及侧翼序列,并且高度保守的21 nt的成熟miR390序列位于茎环的5′端臂上。利用生物信息学软件分析草莓miR390基因的启动子序列发现,除了具有TATA/CAAT-box外,还含有spl、HSE等特异作用元件。定量RT-PCR结果表明,高盐能明显抑制草莓miR390的表达,而低温对其表达影响不大,相同条件下固体培养基比液体培养基更能促进草莓miR390的表达;与GA3等激素相比,IAA能显著增加草莓miR390的表达。【结论】采用IAA质量浓度为0.01 mg·L-1的固体培养基,最能增加草莓微繁殖苗miR390的表达量。 | 李贺 毛健鑫 戚华彩 张志宏 纪明山 | 2014 | 果树学报2014，31，3： | 6 |
| 2 | Identification and functional analysis of miRNAs in developing kernels of a viviparous mutant in maize显示文摘Given the important roles of miRNAs in post-transcriptional gene regulation, identification of differentially expressed miRNAs will facilitate the elucidation of molecular mechanisms underlying kernel development. In this study, we constructed a small RNA library to comprehensively represent the full complement of individual small RNAs and to characterize miRNA expression profiles in pooled ears of maize(Zea mays L.) at 10, 15,20, 22, 25 and 30 days after pollination(DAP). At least 21 miRNAs were differentially expressed. The differential expression of three of these miRNAs, i.e., miR528a, miR167a and miR160b, at each stage was verified by qRT-PCR. The results indicated that these miRNAs might be involved in kernel development. In addition, the predicted functions of target genes indicated that most of the target genes are involved in signal transduction and cell communication pathways, particularly the auxin signaling pathway. The expression of candidate germination-associated miRNAs was analyzed by hybridization to a maize genome microarray, and revealed differential expression of genes involved in plant hormone signaling pathways. This finding suggests that phytohormones play a critical role in the development of maize kernels. We found that in combination with other miRNAs, miR528a regulated a putative laccase, a Ring-H2 zinc finger protein and a MADS box-like protein, whereas miR167a and miR160b regulated multiple target genes,including ARF(auxin response factor), a member of the B3 transcription factor family. All three miRNAs are important for ear germination, development and physiology. The small RNA transcriptomes and mRNA obtained in this study will help us gain a betterunderstanding of the expression and function of small RNAs in the development of maize kernel. | Haiping Ding Jian Gao Mao Luo Hua Peng Haijian Lin Guangsheng Yuan Yaou Shen Maojun Zhao Guangtang Pan Zhiming Zhang | 2013 | The Crop Journal2013，1，2： | 0 |
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