輻照對(duì)瓜實(shí)蠅遺傳區(qū)性品系成蟲(chóng)腸道菌的影響及優(yōu)勢(shì)菌的利用研究初探
[Abstract]:Bactrocera cucurbitae (Coquillett) is an important agricultural pest. Biological control technology of fly, insect sterility technique [Sterile Insect Technique (SIT)] has been more and more favored by agricultural experts at home and abroad. However, the irradiation process in SIT weakens the physical health of the target fly, and there are few detailed reports on this aspect. The effects of irradiation on the diversity and relative abundance of intestinal bacteria in the genetic line [B.cucurbitae genetic sexing strain (GSS)] of melon fruit fly were studied, and the dominant bacteria were isolated, identified and screened, which reduced the damage caused by irradiation to some extent. The results were as follows: 1. 100Gy137Cs was used to irradiate the female, male and male adults of 5, 811 and 13 day old female and male adults of genetic region of fruit fly, and the intestinal flora was sequenced by IlluminaMiSeq sequencing technique based on 16SrDNA. The results showed that there were 4 phylum and 19 main genera in the intestinal tract of female and male adults of fruit fly, among which Proteobacteria was 50%. Firmicutes (2 / 47% of total) and Providencia sp., (Enterobacter sp.) It is the dominant phylum and genus in GSS intestinal tract of fruit fly, respectively. Irradiation significantly reduced the microbial diversity in the intestine and the relative abundance of the dominant genus, which had nothing to do with the sex of the fruit fly and the age of the adult. 2. The traditional microbiological isolation technique was used to isolate the female from the fruit fly. Seven species of bacteria were isolated from the intestinal tract of male adults at 5 days of age. They were Enterobacter (37%), Providence (18.5%), Klebsiella (1.9%) and Bacillus (Lysinibacillus sp. (1.9%). Cedecea sp. (24%), Bacterium sp. (11. 1%) and other unknown genus other (5. 6%). 3. Enterobacter was used as additive for GSS larvae of fruit fly and (PI), was used as a living bacterium. Dead bacteria (API) was used as two treatment groups, and sterile (NPI) was used as control. After feeding host to pupa, the biological and morphological indexes of GSS were measured respectively. The results showed that the live bacteria group could significantly increase the pupae weight of GSS. The head width and chest length were significantly increased in both dead and living bacteria groups, and the average percentage of increase was 18% and 4.72% (female), 15% and 11% (male), respectively. Because Enterobacterium is easy to isolate and culture, it accounts for the largest proportion in the isolated genus, and the application of Enterobacter to optimize larval feed has remarkable effect. The results show that Enterobacter is the dominant genus in the intestinal tract of GSS. It is also a probiotic genus that strengthens larval feed. The results of this study will provide a theoretical basis for the future development and utilization of nutritious bacteria as a feed additive for GSS larvae of fruit flies, thus repairing the damage caused by irradiation to a certain extent, in order to improve the quality of sterile adults. It lays the foundation for the efficient application of SIT technology.
【學(xué)位授予單位】:福建農(nóng)林大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:S433
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