Abstract
Two complexing agents, ethylene diaminetetraacetic acid (EDTA) and 4,7,13,16,21,24-hexaoxy-1, 10-diazabicyclo(8.8.8) hexacosane (Kryptofix™ 222), were applied to corn (Zea mays L.) plants at the time of premeiosis. Using pollen grain analysis, changes in the amounts of genetic exchange within the wx locus could be observed. The mode of action of these complexing agents is only hypothetical; the chemicals may form complexes with cations directly or indirectly associated with the DNA molecules and lead to increases in chromosome breakage and crossing-over. These two chemicals increased wx intragenic exchange significantly. The rate of the wx-intragenic recombination depends, not only on the genetic intragenic distance between wx heteroalleles, but also on the distance between the wx locus and the centromere. Repositioning of the wx locus in relation to the distance to the centromere by using translocated chromosomes showed that the centromere and the breakpoint had an inhibitory effect on the wx-intragenic recombination.
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