DETERMINING LEAF TOUGHNESS AND ITS ROLE IN MAIZE RESISTANCE TO THE EUROPEAN CORN-BORER (LEPIDOPTERA, PYRALIDAE)

被引:46
作者
BERGVINSON, DJ [1 ]
ARNASON, JT [1 ]
HAMILTON, RI [1 ]
MIHM, JA [1 ]
JEWELL, DC [1 ]
机构
[1] UNIV OTTAWA,DEPT BIOL,OTTAWA K1N 6N5,ON,CANADA
关键词
OSTRINIA NUBILALIS; MAIZE; RESISTANCE;
D O I
10.1093/jee/87.6.1743
中图分类号
Q96 [昆虫学];
学科分类号
摘要
An instron technique was developed for determining leaf toughness of maize (Zea mays L.) and its relation to maize resistance to the European corn borer, Ostrinia nubilalis (Hubner). Leaf tissue of field-grown maize was mounted onto a stainless steel plate, and the force required to puncture the leaf was determined using an instron. A rounded cylindrical probe attached to the instron gave consistent leaf-toughness readings. Significant negative correlations were found between leaf toughness and leaf-damage ratings taken at midwhorl and plant tasseling for five different groups of maize germplasm that included multiple borer-resistant cultivars and inbreds, Mexican landraces, BS9 selection cycles, and North American inbreds. Leaf toughness appears to be an important defense mechanism in maize across diverse groups of germplasm. Instron measurements of leaf toughness can be used to monitor leaf toughness in resistance breeding programs and as a tool to better understand phytochemical contributions to leaf toughness and behavioral ecology of lepidopteran folivores feeding on maize.
引用
收藏
页码:1743 / 1748
页数:6
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