期刊
PHYSIOLOGICAL AND MOLECULAR PLANT PATHOLOGY
卷 69, 期 1-3, 页码 109-117出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pmpp.2007.02.004
关键词
flavonoids; Fusarium graminearum; Fusarium verticillioides; phytoalexin; 3-deoxyanthocyanidin; Zea mays
In maize, Fusarium ear rots lead to contamination of grains with mycotoxins and loss of yield. We tested if induced expression of 3-deoxyanthocyanidins and related 3-deoxyflavonoid (flavan-4-ols) compounds in maize silks and kernels impart resistance to Fusarium ear rot. In maize, condensed flavan-4-ols (phlobaphenes) accumulate in floral organs including silks and kernel pericarps and their biosynthesis is regulated by Pericarp color] (PI) and a linked paralog P2. Three maize lines differing for allelic constitution at the P locus were compared for their response to Fusarium verticillioides and F. graminearum. The moderately resistant maize line P1-rr4B2 carrying both the PI and the P2 gene showed enhanced accumulation of 3-deoxyanthocyanidins in inoculated silks. The line 4Co63 carrying only the P2 gene exhibited highest resistance to F. verticillioides. Expression data revealed that: flavonoid pathway genes were active during the early stages of silk development. In kernels, however, induction of the flavonoid pathway genes was later than that in silks, and higher transcriptional induction was observed in line carrying both PI and P2 genes. Among the PR genes tested, PR-4 and PR-5 showed developmental as well as fungus-induced expression. Field based ear rot incidence could be correlated with the presence of functional P locus as well as genetic background of the tested maize lines. (c) 2007 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据