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Title: Influence of leaf color in a dry bean mapping population on Empoasca sp. populations and host plant resistance

Author
item Brisco, E. - Michigan State University
item Porch, Timothy - Tim
item Kelly, J - Michigan State University

Submitted to: Bean Improvement Cooperative Annual Report
Publication Type: Research Notes
Publication Acceptance Date: 3/1/2012
Publication Date: 3/15/2012
Citation: Brisco, E.I., Porch Clay, T.G., Kelly, J.D. 2012. Influence of leaf color in a dry bean mapping population on Empoasca sp. populations and host plant resistance. Bean Improvement Cooperative Meeting Abstracts. 55:83-84.

Interpretive Summary: The potato leafhopper (PLH), is currently the most abundant insect pest of dry beans in Michigan. Temperate Empoasca fabae and tropical E. kraemeri populations were evaluated in a genetic population of Matterhorn, a susceptible Michigan commercial variety, by EMP507, a line developed for E. kraemeri resistance. Leaf surface color was measured using the Hunter Lab color scale where difference in values plotted in the color space correspond to visual differences. Correlations between Lab spectra and nymph populations were examined to determine whether leaf color plays a role in PLH host preferences and plant resistance. These studies were conducted at MSU, East Lansing, MI in 2011 and at TARS, USDA, Isabela, PR in 2010 and 2011. This data will be used along with the genetic map to determine the location of genes that provide resistance to the PLH, which can then be used to improve common bean for resistance to this important crop pest.

Technical Abstract: Temperate Empoasca fabae and tropical E. kraemeri populations were evaluated in an IBL population of Matterhorn, a susceptible Michigan commercial variety, by EMP507, a line developed by CIAT for E. kraemeri resistance. Leaf surface color was measured using the Hunter L a b color scale where difference in values plotted in the color space correspond to visual differences. Correlations between L a b spectra and nymph populations were examined to determine whether leaf color plays a role in E. sp. host preferences and antixenosis-type resistance. Studies were conducted at MSU, East Lansing, MI in 2011 and at TARS, USDA, Isabela, PR in 2010 and 2011.