A hydroponic experiment was carried out to study the effects of UV-B radiation (5.0kJ/m2) on root morphology and root exudates in the local rice variety Baijiaolaojing in a terraced field in the Yuanyang region of China. It was observed that UV-B radiation had the following impact on rice physicochemical properties (1) significant inhibition in both root biomass and the whole biomass of rice, (2) significant increase in the free amino acid and total phenol content secreted by roots on the 40th and 60th day of growth, (3) significant increase in the soluble sugar content in all three growth phases (4) significant increase in oxalic acid and succinic acid, (5) significant decrease in malic acid. The content of tartaric acid was not significantly impacted by the two treatments (natural light 0 kJ/m2, UV-B radiation (5.0kJ/m2). Therefore, UV-B enhancement significantly affects the content of low molecular organic acids in rice, which is closely related to its altered root morphology.

Atrazine is a triazine herbicide selectively used on maize, sorghum, cotton and other crops [1]. It is stable and persistent in soil, which has brought huge pollution to soil, surface water and groundwater [2]. In addition, atrazine is a hormone disruptor, harmful to human health and the sustainable development of the ecosystem [3-4]. At present, the way to deal with pesticide pollution is to control the quantity of pesticides in the environment, including landfill treatment of polluted soil (which is also expensive). Microbial remediation is a good alternative method that has high efficiency and leaves no residue [5-7]. Atrazine can be deaminated, dechlorinated, and ring cracked by microorganisms. To date, many atrazinedegrading microbes have been found [8-18], and some highly efficient atrazine-degrading strains have been constructed by genetic engineering [19]. Among those, the degradation pathways of the Pseudomonas sp. ADP and Arthrobacter aurescens TC1 strains have been most extensively studied, and they are used as the model strains for the study of atrazine biodegradation [20-22]. The degradation genes atzA, B, C, D, E, and F,