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United States Department of Agriculture

Agricultural Research Service

Research Project: IMPROVING ALFALFA AND OTHER FORAGE CROPS FOR BIOENERGY, LIVESTOCK PRODUCTION, AND ENVIRONMENTAL PROTECTION

Location: Plant Science Research

Title: Cell Wall Composition as a Maize Defense Mechanism Against Corn Borers

Authors
item Barros-Rios, Jaime -
item Malvar, Rosa -
item Jung, Hans Joachim
item Santiago, Rogelio -

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: June 1, 2010
Publication Date: July 25, 2010
Citation: Barros-Rios, J., Malvar, R.A., Jung, H.G., Santiago, R. 2010. Cell Wall Composition as a Maize Defense Mechanism Against Corn Borers [abstract]. XII Cell Wall Meeting, July 25-30, 2010, Porto, Portugal. p. 23.

Technical Abstract: European and Mediterranean corn borers (Ostrinia nubilalis Hubner and Sesamia nonagrioides Lefebvre) are two of the most economically important insect pests of maize in North America and southern Europe, respectively. Cell wall structure and composition were evaluated in pith tissues of diverse inbred lines as possible resistance traits. Cell wall polysaccharide and lignin concentration and composition, cell wall bound forms of hydroxycinnamic acids, and 24-h and 96-h in vitro rumen degradabilities were measured. Resistant inbred lines had significantly higher concentrations of total cell wall material than susceptible lines, indicating that thickness of cell walls could be the initial barrier against corn borer larvae attack. In addition, higher concentrations of xylose and 8-O-4' diferulate esters were found in the resistant group. Stem tunneling by corn borers was negatively correlated with 8-5'b and 5-5' diferulates and p-coumarate esters. Neither 24- nor 96-h in vitro rumen degradabilities were correlated with corn borer damage. Cell wall concentration, polysaccharide composition, and cross linking by diferulates appeared to be possible mechanisms of corn borer resistance; on the other hand, corn borer resistance was not associated with reduced rumen degradability.

Last Modified: 7/25/2014
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