MEIOTIC CHROMOSOME BEHAVIOUR OF APOGAMOUSLY PRODUCED HAPLOID SPOROPHYTES IN WOODWARDIA ORIENTALIS AND W. PROLIFERA

摘要

Sporogenesis of dihaploid Woodwardia orientalis with 2n=68 and haploid W. prolifera with 2n=34 produced by induced apogamy was investigated. The meiotic chromosome behaviour in spore mother cells of dihaploid W. orientalis showed many bivalent chromosomes, while that of haploid W. prolifera showed 34 univalent chromosomes at metaphase I. These observations support a basic chromosome number of x=34 for Woodwardia, with W. orientalis being an autotetraploid (2n=4x=136) and W. prolifera a diploid (2n=2x=68). Guard cell sizes of both induced haploid sporophytes were smaller than those their parental sporophytes (t<0.01).