Phenolics in Maize Genotypes Differing in Susceptibility to Gibberella Stalk Rot (Fusarium graminearum Schwabe)
详细信息 查看全文
- 作者：Rogelio Santiago ; Lana M. Reid ; John T. Arnason ; XiaoYang Zhu ; Noelia Martinez ; Rosa A. Malvar
- 刊名：Journal of Agricultural and Food Chemistry
- 出版年：2007
- 出版时间：June 27, 2007
- 年：2007
- 卷：55
- 期：13
- 页码：5186 - 5193
- 全文大小：98K
- 年卷期：v.55,no.13(June 27, 2007)
- ISSN：1520-5118
文摘
The relationship between phenolic compounds and maize pith resistance to Fusarium graminearum,the causal agent of Gibberella stalk rot, was investigated. The phenolic acid profiles in the stalks ofsix maize inbred lines of varying susceptibility were evaluated from silking to grain maturity. Fourdifferent fractions of phenolic compounds were extracted from inoculated and non-inoculated (control)pith tissues: insoluble cell-wall-bound, free, soluble ester-bound, and soluble glycoside-boundphenolics. Analysis by HPLC revealed that p-coumaric acid and ferulic acid were the most abundantcompounds in the soluble and cell-wall-bound fractions. The quantity of free, glycoside-bound, andester-bound phenolics in the pith was lower than the level required for the inhibition of Fusariumgrowth or mycotoxins production; however, significant negative correlations between diferulic acidcontents in the cell walls and disease severity ratings 4 days after inoculation were found. The resultsindicated that future studies should focus on the levels of diferulic acids during the early infectionprocess. Diferulates may play a role in genotypic resistance of maize to Gibberella stalk rot aspreformed barriers to infection.