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过去测定各种玉米品种和基因型对玉米螟的抗性,是通过田间观察和检查进行的。以前一直认为,玉米对玉米螟的抗性的强弱,是取决于玉米植株中“丁布”(一种植物体内的有机酸)含量的大小。1974年以来,美国科研人员发现,若干热带玉米基因型,在大田中对玉米螟有很强的抗性,但这些玉米植株中的丁布含量,却与美国玉米带一些易感玉米螟的自交系一样低。由此发现了过去不知道的玉米螟抗性来源。
In the past, the resistance of various corn varieties and genotypes to Ostrinia furnacalis was determined by field observations and inspections. It has been previously thought that the resistance of maize to Ostrinia furnacalis depends on the amount of “cloth” (an organic acid in the plant) in the corn plant. Since 1974, American researchers have found that a number of tropical corn genotypes are highly resistant to corn borer in the field, but the content of butyric in these corn plants is not as high as that of some susceptible corn borers in the US corn belt The same is true. This led to the discovery of a previously unknown source of resistance to Ostrin concarsmilles.