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Effect of cultivars and irrigation waters on persistence of indicator bacteria on lettuce grown in high tunnel
Journal of Food Safety ( IF 1.9 ) Pub Date : 2020-03-31 , DOI: 10.1111/jfs.12795
Hsin‐Bai Yin 1 , Chi‐Hung Chen 1 , Shraddha Karanth 2 , Suyeun Byun 1 , Christine Mayer 3 , Dana Harriger 3 , Abani Pradhan 2 , Jitendra Patel 1
Affiliation  

Effect of irrigation with groundwater (GW), primary‐treated wastewater (PTWW), secondary‐treated wastewater (STWW), and roof‐collected rainwater (RCR) on the microbial quality of lettuce cultivars “Annapolis,” “Celinet,” and “Coastline” grown in high tunnel was investigated. Lettuce plants were spray irrigated with irrigation waters once a week for 2 weeks and analyzed for indicator and pathogenic bacteria. PTWW irrigation resulted in the highest Escherichia coli recovery on the lettuce plants (4.7 log MPN/g) as compared to irrigation with other three waters on 0 day postirrigation (dpi). Lettuce cultivars affected the bacterial die‐off rate, where E. coli populations reduced the most by 1.5 log MPN/g on “Annapolis” lettuce on 2 dpi. The STWW and RCR irrigation did not significantly influence indicator bacterial populations on lettuce as compared to GW irrigation. The STWW and RCR containing low populations of indicator bacteria may be suitable for lettuce irrigation in Mid‐Atlantic area without affecting its microbial quality.

中文翻译:

栽培品种和灌溉水对高地隧道生菜指示菌持久性的影响

地下水灌溉 (GW)、一级处理废水 (PTWW)、二级处理废水 (STWW) 和屋顶收集雨水 (RCR) 对生菜品种“Annapolis”、“Celinet”和“Celinet”微生物质量的影响调查了在高隧道中生长的海岸线。用灌溉水每周喷灌一次莴苣植物,持续 2 周,并分析指示菌和病原菌。与在灌溉后 0 天 (dpi) 使用其他三种水进行灌溉相比,PTWW 灌溉导致生菜植物上的大肠杆菌回收率最高 (4.7 log MPN/g)。生菜品种影响了细菌的死亡率,其中大肠杆菌种群在 2 dpi 的“安纳波利斯”生菜上减少了 1.5 log MPN/g。与 GW 灌溉相比,STWW 和 RCR 灌溉没有显着影响生菜上的指示菌种群。含有少量指示菌的 STWW 和 RCR 可能适用于大西洋中部地区的生菜灌溉,而不会影响其微生物质量。
更新日期:2020-03-31
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