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Assessing Stomatal Response to Live Bacterial Cells using Whole Leaf Imaging

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Bacterial Leaf Blight on shrunken-2 Sweet Corn.

J K Pataky¹, L J du Toit¹, M R Kerns¹

¹Department of Crop Sciences, University of Illinois, Urbana 61801.

|March 14, 2019

Summary

This summary is machine-generated.

Bacterial leaf blight (BLB) did not significantly impact sweet corn yield in trials, even on susceptible shrunken-2 (sh2) hybrids. This research assessed BLB severity and its economic loss potential on various sh2 sweet corn varieties.

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Area of Science:

Plant Pathology
Agronomy
Genetics

Background:

Bacterial leaf blight (BLB), caused by Acidovorax avenae subsp. avenae, poses a threat to shrunken-2 (sh2) sweet corn production.
Sporadic outbreaks and severity in conducive environments necessitate understanding BLB's economic impact.

Purpose of the Study:

Evaluate the severity of BLB on sh2 sweet corn hybrids, inbred lines, and crosses.
Assess the impact of BLB on sweet corn yield, specifically ear weight and marketable ear count.
Determine the potential for economic losses due to BLB in sh2 sweet corn.

Main Methods:

Field evaluations of 122 sh2 hybrids, 30 sh2 inbred lines, and 29 crosses over two years (1994 and 1996).
Assessment of BLB severity using a 1-9 rating scale.
Measurement of ear weight and marketable ear number to determine yield impact.
Comparison of inoculated and non-inoculated plots to isolate BLB effects.

Main Results:

Average BLB severity ratings for hybrids were 3.3 (1994) and 3.7 (1996) on a 1-9 scale.
No significant differences in BLB ratings were observed among kernel colors (yellow, white, bicolor).
Despite moderate foliar symptoms, BLB did not substantially affect overall yield, with only minor reductions in ear weight for a few hybrids in one year.

Conclusions:

BLB severity varied among sh2 sweet corn genotypes, but mid-parent values generally predicted cross reactions.
Economic losses from BLB were not substantial in these trials, even for susceptible hybrids.
Further research may be needed to identify specific genetic resistance or management strategies for BLB in sh2 sweet corn.