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The corresponding pairing behaviour of the chromosomes of A. magna and A. abyssinica was determined in triploid and pentaploid hybrids. Much higher overall pairing was found in the A. abyssinica than in the A. magna triploids indicating reduced homology between the A genomes of the diploids and A. magna and the absence of homoeology between the A genome and the second genome of A. magna. In contrast, pairing was much higher in the A. magna pentaploid than that of A. abyssinica. It was concluded that the second genome of A. magna is closely related to one genome other than the A of the hexaploids. On the ground of morphology, cross-compatibility and the pairing behaviour of chromosomes it was proposed that A. magna has the genomes AADD and that it is the putative ancestral tetraploid of the hexaploid species. This hypothesis can be tested by a synthetic allohexaploid derived from A. ventricosa and A. magna.
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Rajhathy et al. (1969) studied this question.
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