产膜功能菌的筛选以及与水稻互作阻控重金属作用的研究【字数:10883】
目录
摘要 4
关键词 4
ABSTRACT 5
引言
1 实验材料 8
1.1 土壤采集 8
1.2 供试植物 8
2 实验方法 8
2.1 产膜功能菌的筛选 8
2.1.1 功能菌株的分离、纯化和保藏 8
2.1.2 功能菌株产生物膜测定 9
2.2 产膜功能菌株的生理功能测定 9
2.2.1 菌株产IAA的测定 9
2.2.2 菌株产铁载体能力的测定 9
2.2.3 菌株抗生素抗逆性测定 10
2.2.4 菌株重金属抗逆性测定 10
2.3 产膜功能菌的土壤固定 10
2.4 产膜功能菌的鉴定 10
2.4.1 菌株16rRNA的扩增 11
2.4.2 菌株16rRNA序列测定和构建进化树 11
2.5 产膜功能菌水培下的水稻苗耐CD功能研究 11
2.5.1 供试菌株菌悬液的制备 11
2.5.2 水稻水培实验 12
2.5.3 水稻生物量的测定 12
2.5.4 水稻组织cd *51今日免费论文网|www.51jrft.com +Q: @351916072@
含量测定 12
2.6 数据处理 12
3 结果分析 13
3.1 产膜功能菌株的筛选结果 13
3.1.1 抗Cd功能菌的筛选 13
3.1.2 产生物膜功能菌的筛选 13
3.2 产膜功能菌的生理功能 13
3.3 产膜功能菌的土壤固定 16
3.4 产膜功能菌16RRNA鉴定结果 17
3.5 产膜功能菌与水稻苗的互作 18
3.5.1 产膜功能菌对水稻的促生作用 18
3.5.2 产膜功能菌对Cd的阻控作用 20
4 讨论 22
致谢 24
参考文献: 25
产膜功能菌的筛选以及与水稻互作阻控重金属作用的研究
摘要
随着人类生产活动的范围逐渐扩大,人为资源在生产活动中占比越来越大,导致的环境污染问题越来越严重。其中,由于矿山的开采以及农药、化肥等化学物质的滥用,导致我国耕地重金属污染程度愈加严重。同时,自然因素中矿物质的解离、大气沉积等也是导致重金属污染的重要原因。土壤的污染不仅破坏环境,也会损坏土壤地质,逐渐积累后对植物的生理和分子活动产生不利影响,进而影响农作物的生长,对人类健康产生极大的威胁。在对于重金属土壤污染的修复技术中,化学固定剂有着一定的修复效果,但长时间使用会导致土壤质量的下降,而生物修复技术对于重金属污染环境和修复具有重要的理论研究意义和潜在的应用价值。产生物膜功能菌能够在植物根部定植,通过形成生物膜来阻控农作物对于cd的吸收,在修复土壤重金属污染和农作物的安全生产方面有巨大的潜力。本文通过筛选出根部产生物膜功能菌作为供试菌株,并以水稻为供试植物。在水培条件下,研究功能菌株对于水稻苗阻控cd吸收的情况,对产膜功能菌与水稻互作机制进行探究,为产膜功能菌阻控水稻作物吸收cd的机制研究提供理论依据。
SCREENING OF MEMBRANEFORMING FUNCTIONAL BACTERIA AND THEIR INTERACTION WITH RICE TO PREVENT AND CONTROL HEAVY METALS
ABSTRACT
With the gradual expansion of the scope of human production activities, human resources account for an increasing proportion of production activities, resulting in more and more serious environmental pollution problems. Among them, due to the mining of mines and the abuse of chemicals such as pesticides and chemical fertilizers, the pollution of heavy metals in cultivated land in China is becoming more and more serious. Soil pollution not only destroys the environment, but also damages soil geology, which gradually accumulates and adversely affects the physiological and molecular activities of plants, which in turn affects the growth of crops and poses a great threat to human health. In the remediation technology of heavy metal soil pollution, chemical fixative has a certain remediation effect, but longterm use will lead to the decline of soil quality. the bioremediation technology has important theoretical research significance and potential application value for heavy metal pollution and remediation. Membraneproducing functional bacteria can colonize in the roots of plants and form biofilms to control the absorption of Cd by crops, which has great potential in repairing heavy metal pollution in soil and safe production of crops. In this paper, root membraneproducing functional bacteria were selected as the tested strains, and rice was used as the tested plant. Under the condition of hydroponic culture, the inhibition and control of cd uptake by rice seedlings by functional strains was studied, and the interaction mechanism between filmproducing functional bacteria and rice was explored, so as to provide a theoretical basis for the study of the mechanism of membraneproducing functional bacteria blocking and controlling cd uptake by rice crops.
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