Abstract
Natural intergeneric hybrids betweenAster ageratoides subsp.ovatus (2n=36) andKalimeris incisa (2n=72) were found. All of the hybrids studied were found to have 2n=72, 18 more chromosomes than a regular F1 hybrid. The hybrids were found to be of two types: one having 18 large chromosomes ofovatus, and the other having 9 large chromosomes of the same subspecies. In meiosis of the PMCs of the hybrid with 18 large chromosomes, a regular chromosome configuration, 36II, was observed. In PMCs of the hybrid with 9 large chromosomes an irregularity of chromosome pairings was observed, showing varied chromosome configurations: 35II+2I, 34II+4I, 33II+6I, IIII+33II+3I, 1IV+32II+4I, 32II+8I, 31II+10I, 29II+14I, 3III+29II+5I. Most univalents were large, but a few were small. The hybrids with 18 large chromosomes were found to be partial amphidiploid and possessing double chromosome complements ofovatus. The hybrids with 9 large chromosomes were found to be the first backcrossed generation between the hybrid with 18 large chromosomes andK. incisa.
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