01300nas a2200217   4500008004100000245013400041210006900175260001200244300001400256490000700270520057000277653001500847653001200862653001400874653001700888653001300905100001600918700001400934700001700948856011700965       2003                        eng d00aIsoetes (isoetaceae), Ophioglossum and Botrychium (ophioglossaceae) in Calabria (S Italy): More karyological and taxonomical data0 aIsoetes isoetaceae Ophioglossum and Botrychium ophioglossaceae i  c2003///  a359 - 3630 v563 aI. subinermis (Durieu) Cesca and Peruzzi, from a newly discovered Calabrian stand, was karyologically studied. Both chromosome number (2n = 22) and karyotype are presented. Systematic distinctiveness of I. subinermis from I. histrix Bory is confirmed. A new chromosome complement (2n = 44) is recorded for I. duriei Bory, confirming the karyological variability of this taxon. Ophioglossum lusitanicum L. (n = 120) and Botrychium lunaria L. (2n = 90) were karyologically studied too. Their chromosome numbers are reported as the first counts on Italian populations.10aBotrychium10aIsoetes10aKaryology10aOphioglossum10ataxonomy1 aPeruzzi, L.1 aCesca, G.1 aPuntillo, D.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-77949731523&partnerID=40&md5=40e99c3e1ecb2fbbe5af20ec7f01717702429nas a2200217   4500008004100000245010100041210006900142260001200211300001400223490000700237520170000244653002801944653001401972653001801986653002102004653002202025100001902047700001402066700001402080856011702094       2007                        eng d00aIrregular meiotic behavior in Isoetes sinensis (Isoetaceae), a rare and endangered fern in China0 aIrregular meiotic behavior in Isoetes sinensis Isoetaceae a rare  c2007///  a358 - 3630 v603 aChromosomal abnormalities including cytomixis occurred in meiotic process of pollen mother cells of many angiosperm species at high frequency, but similar phenomenon was rarely reported in low vascular plants. This study we investigated the microsporogenesis of Isoetes sinensis Palmer, a quillwort of ancient heterosporous lycopsids Isoetaceae plants. Irregular chromosomal behavior especially cytomixis was emphasized. It appeared in each stage of meiotic division from prophase I to telophase II. The cytoplasmic channels between microspore mother cells were narrow and stretched. The genetic material connection was maintained mainly by visible chromatin fiber. The cytomixis was just occurred between two adjacent microspore mother cells of same stages. A variety of other abnormal chromosomal behaviors including chromosomal stickiness, fragmentation, bridge, laggards, micronucleus, were observed, albeit with low frequency. All sorts of chromosomal abnormalities were counted at two stages, anaphase I and anaphase II. They were approximately 24.4% and 26.9% respectively. This number was slightly higher than that of microspore abortion which was about 14.8%. I. sinensis was listed as a critical endangered species due to habitat fragmentalization, water pollution and wetland degradation. Human being activities are without doubt the immediate forces resulting in the population decreasing of I. sinensis. Whether the individual numbers dropping or habitat withdraw has consequently caused the producing of the overall high abnormalities of chromosomal behaviours is not determined yet. However, cytomixis and other irregular chromosomal phenomenon seemed not to be a natural process.10aChromosomal abnormality10aCytomixis10aEastern China10aIsoetes sinensis10aMicrosporogenesis1 aHeng-Chang, W.1 aLi, J.-Q.1 aHe, Z.-C.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-49449109278&partnerID=40&md5=10a888a1588bfcc9524b7cca21020912