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27 Applications of Quantitative Microscopy in Plant Surface Microbiology 539<br />

Fig. 14. CMEIAS spatial<br />

density analysis of<br />

prokaryotic microorganisms<br />

colonized on the<br />

phylloplane of fieldgrown<br />

control corn<br />

(36N05) and BT-corn<br />

(3573)<br />

Table 3. Spatial abundance of filamentous fungi on the phylloplane of field-grown corn.<br />

Values reported are per mm 2 phylloplane <strong>surface</strong> area<br />

Spatial abundance parameter Control (36N05) corn BT (3573) corn<br />

Filamentous hyphae cover (%) 12.7 6.4<br />

Cumulative hyphal length (mm) 1737 803<br />

Hyphal bio<strong>surface</strong> area (mm 2 ) 4244 2035<br />

Hyphal biovolume (mm 3 ) 816 439<br />

Hyphal biomass carbon (fg) 163 88<br />

Table 3 summarizes the CMEIAS-based analyses of spatial abundance for<br />

the filamentous fungi on these corn phylloplanes. CMEIAS recognizes filamentous<br />

microorganisms in digital images based on their shape characteristic<br />

of a length/width ratio >16 without wave form periodicity, and classifies<br />

unbranched and branched filaments separately based on whether they have<br />

more than two cell poles (Liu et al. 2001).All five CMEIAS measurement parameters<br />

indicated an approximate 99 % higher spatial abundance of filamentous<br />

fungi biomass on the Pioneer 36N05 control corn variety.<br />

These results illustrated in this second example indicate that CMEIAS performs<br />

admirably in the in situ analysis of phylloplane microbial communities.<br />

One could definitively conclude from the results that different microbial communities<br />

developed on the phylloplane sampled from field-grown Pioneer<br />

36N05 and Pioneer 3573 varieties of corn, but more thorough studies would<br />

be necessary before reaching any firm conclusion regarding the possible

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