[Effect of abamectin insecticide on the microbial community in broccoli phyllosphere].
The indigenous microbial communities within the plant phyllosphere are highly diverse and include many different species of bacteria, filamentous fungi, yeasts and algae which play important ecological roles. This study was the first attempt to assess the impact of abamectin treatments on microbial communities of broccoli phyllosphere using two culture-independent techniques of phospholipid fatty acid analysis (PLFA) and terminal restriction fragment length polymorphism (T-RFLP). Results showed that low concentration of abamectin treatments did not affect the microbial biomass and microbial community structure of broccoli phyllosphere significantly. However, high concentration of abamectin treatments significantly change the microbial community structure including a decrease of total and bacterial biomass, and a decrease in the ratio of Gram-positive bacteria to Gram-negative bacteria, but did not change the fungal biomass. Moreover, PLFA suggested that the number of unsaturated and cyclopropane phospholipid fatty acids (PLFAs: 16: 1omega9t, 18: 1omega7, cy17:0 and cy19:0) increased with high concentration abamectin treatment, while the saturated PLFAs i15:0, a15:0, i16:0 and a17:0 decreased. The appearance terminal restriction fragments (T-RFs: 58, 96, 236 and 420 bp) indicated that some bacteria might play a significant role in abamectin degradation in broccoli phylosphere, while the disappeared T-RFs (51, 89, 99, 338, 66, 223 and 482 bp) implied some other bacteria might potentially serve as microbial indicator of abamectin exposure.
Zhang
Bao-Guo
BG
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Tang
Ling
L
Li
Zu-Ming
ZM
Wang
Hui-Li
HL
Xu
Wen-Ting
WT
Zhang
Hong-Xun
HX
Zhuang
Guo-Qiang
GQ
Bai
Zhi-Hui
ZH
D001419:Bacteria / Q000145:classification / Q000187:drug effects* / Q000235:genetics; D044822:Biodiversity; D001937:Brassica / Q000382:microbiology*; D005227:Fatty Acids / Q000032:analysis; D007306:Insecticides / Q000633:toxicity*; D007559:Ivermectin / Q000031:analogs & derivatives* / Q000633:toxicity; D010743:Phospholipids / Q000032:analysis; D012150:Polymorphism, Restriction Fragment Length
D005227:Fatty Acids; D007306:Insecticides; D010743:Phospholipids; C048324:abamectin; D007559:Ivermectin