刺萼龍葵種子萌發(fā)相關(guān)的甘露聚糖酶基因的克隆及表達(dá)研究
[Abstract]:Solanum nigrum is a poisonous and harmful weed native to North America. Because of its wide adaptability and strong competitive ability, it has spread and settled in many areas of China, which has seriously damaged the biodiversity of the invading land. Seed is the root of weed damage and spread. The seed of Solanum nigrum has dormancy characteristics, which is not conducive to the centralized control and eradication of the population. In order to explore the molecular regulation mechanism of dormancy germination of Solanum nigrum seeds, two genes of mannanase family, SrMAN1 and SrMAN2, were cloned for the key enzyme of degradation of endosperm tissue during seed germination. The changes of gene expression during seed soaking and germination were detected at the transcriptional level, the prokaryotic expression of the target gene was carried out, and the function of the recombinant protein was verified by gel diffusion method. The main results are as follows: 1. Two 尾 -mannanase related genes were cloned from Solanum nigrum. The coding sequence of 3075 bp.SrMAN1 gene of 1921 bp,SrMAN2 gene of SrMAN1 gene was 1143 bp, encoding 380 amino acids and the molecular weight of protein was 42.9 kD,. The coding sequence of 5.4.SrMAN2 gene with isoelectric point is 1242 bp, encoding 413 amino acids and the molecular weight of protein is 46.6 kD, isoelectric point 5.2.2. Real-time fluorescence quantitative PCR analysis showed that the expression of SrMAN1 and SrMAN2 genes reached the peak when the radicle elongation was about 10 mm, and the cotyledon was exposed to about 2 mm under gibberellin treatment. With the prolongation of water absorption time, the relative expression of the two genes was lower under the action of abscisic acid. Under the treatment of gibberellin and water, the expression of the two genes increased first and then decreased, and gibberellin made the expression peak of the two genes appear earlier. Under gibberellin treatment, the peak of SrMAN1 gene expression was higher than that of water treatment, and the peak of SrMAN2 gene expression was lower than that of clear water treatment. Both SrMAN1 and SrMAN2 genes were expressed before and after germination of Solanum nigrum seeds. There was no significant tissue specificity and time specificity. Gibberellin could affect the expression of SrMAN1 and SrMAN2 genes to some extent, but the effect of gibberellin on SrMAN2 gene was weaker than that of SrMAN1 gene. The recombinant expression vectors of SrMAN1 and SrMAN2 genes pET-32a-SrMAN1 and pET-32a-SrMAN2, were successfully constructed to induce expression in E.coli BL21 (DE3). SDS-PAGE showed that the location of the SrMAN1,SrMAN2 fusion protein was similar to that of the predicted SrMAN1 fusion protein (62.78 kD), SrMAN2 fusion protein (66.37 kD). The gel diffusion test showed that the successfully expressed strain incubated on the gel substrate of mannan showed a significantly increased hydrolysis circle, which confirmed that the fusion protein had the activity of hydrolysis of mannanase.
【學(xué)位授予單位】:中國農(nóng)業(yè)科學(xué)院
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:S451
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