COMPARTMENTALIZATIONS OF THE FERN GENOME AND THE GENE BLOCK HYPOTHESIS REVISITED | BIONATURE

In the life cycle of homosporous ferns, the regular alternation of morphologically distinct and independent gametophytic ("haploid") and sporophyte ("diploid") generations provides exceptional opportunities to understand the causes of phase change and dissect their genomes into sporophytic and gametophytic components. The possibility of induced apospory and induced apogamy, which may help to answer issues about life cycle regulation without the obvious complexities of the haploid-diploid chromosome cycle, is an added benefit. As indicated by genetic burden in the form of recessive lethal genes active exclusively in the sporophytic generation, the genome of ferns is compartmentalised. The challenges surrounding phase transition are briefly discussed, with a focus on Mehra's Gene-Block concept.

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