Abstract
A panel count method and a phospholipid fatty acid analysis technique were used to investigate the responses of Di-(2-Ethylhexyl) Phthalate (DEHP) pollutants to the phyllosphere microbial communities of Chinese Cabbage. The results of plate count analysis showed that the number of culturable microorganisms could be lower than that of water spray after treated with a certain amount of DEHP pollutant. The results of phospholipid fatty acid analysis showed that DEHP pollution treatment had certain effects on the biomass and community structure of leaf microorganisms in leaves of Chinese Cabbage. After spraying 1d, the biomass of the total leaf microorganisms, fungi and bacteria in the leaves of vegetables decreased, which was significantly different from that in the control and the blank groups. There was little change in the ratio of the characteristic phospholipid fatty acids between gram positive bacteria and gram negative bacteria.
Highlights
Aerial plant surfaces are generally colonized by large numbers of different microorganisms including bacteria, filamentous fungi, yeasts and algae
The number of culturable microorganisms in the leaves of vegetables was counted by plate count method, in which the number of fungi was mainly counted in the solid medium of vegetable juice
That the number of microorganism with time and environment showed dynamic changes and after spray and spray Di-(2-Ethylhexyl) Phthalate (DEHP) treatment has obvious influence on the vegetables phyllospheric microorganism, spray DEHP is likely to inhibit some of DEHP sensitive microbial growth and reproduction and it is good for some water like wet microbial growth and reproduction
Summary
Aerial plant surfaces are generally colonized by large numbers of different microorganisms including bacteria, filamentous fungi, yeasts and algae. Microorganisms in the phyllosphere may include those that are pathogenic to the plant and nonpathogenic organisms, which play an important role in altering plant surface properties, fixating nitrogen, promoting the growth of plants, controlling the plant pathogens, degrading organic pollutants and being an ideal monitors of plants pollution (Krechel et al, 2002; Krimm et al, 2005; Kvasnikov et al, 1974; Sandhu et al, 2007; Schreiber et al, 2005). We found that vegetables grown in plastic film and plastic industrial areas mainly absorbed DEHP in the atmosphere through the leaves or above ground parts and accumulated to the stems, fruits and roots, which eventually led to the pollution of vegetables by DEHP.
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