engleski

Study of Maize Inbreds and Hybrids for Resistance to Fusarium graminearum Schw. Infection via the Silk

Within the maize breeding program, 63 inbreds and 62 maize hybrids were tested, using for the first time in 1998 a new method of artificial ear infection with Fusarium graminearum into the silk channel (1). In 7 trials significant differences in resistance degree among the tested lines and hybrids were obtained. Estimates obtained by a 1-7 scale varied from 1.0 to 5.1 for the lines and from 1.4 to 4.4. for the hybrids. Mean values of 27 single cross hybrids to Fusarium ear rot was compared to mean values of the parents resistance. Correlation coefficient of r=0.72 was obtained, which indicates that only approximate hybrid resistance can be predicted from line resistance. Therefore, testing for resistance needs to be conducted with both lines and hybrids. In 1999, the second year of investigation, 37 inbred lines were tested. The ratings ranged from 1.6 to 6.5 and the differences were statistically significant. Also, screening of 1121 maize hybrids, mostly testcrosses, was made for resistance to F. graminearum ear rot and ratings ranged from 1.0 to 6.2. Susceptible hybrid combinations were identified, as well as inbred lines which need to be improved for their degree of resistance to F. graminearum ear rot. 1. Reid, L.M., Hamilton, R.I., Mathev, D.E. 1996. Screening Maize for Resistance to Gibberella Ear Rot. Technical Bulletin 1996-5E. Research Branch, Agriculture and Agri-Food Canada.

maize; disease resistance; Fusarium graminearum

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