By Prof. Dr. Theodor Butterfass (auth.)
The topic of this publication has now not been handled comprehensively earlier than. for a few years i've got hesitated to try a monographic presentation simply because I felt uneasy concerning the suggestion of delineating whatever i'm really not yes approximately myself, and that i felt it'd be rash to aim to combine what seemed-and principally nonetheless seems-to encompass a heap of tessera now not becoming jointly. The conviction gained over, in spite of the fact that, that the various information amassed to date demand a few order now, and that an appraisal of the place we stand will be applicable. This e-book, i'm hoping, can fill a spot barring find out how to additional development within the box. it's not just a compilation of information but in addition an try and delineate the 1st outlines of a picture-blurry, imprecise, and debatable because it needs to seem. The mind's eye of the study employee could be aroused, i'm hoping, and stimulate extra development. as well as info generally dispersed within the literature a lot unpublished fabric has been incorporated. The constrained area to be had avoided me from giving all of the information recognized. the topic is additionally associated with many neighboring fields of analysis, yet those relationships and their ramifications couldn't be mentioned at size. it is a minor shortcoming, even though, in comparison with our nice lack of knowledge of the topic in general.
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Additional info for Patterns of Chloroplast Reproduction: A Developmental Approach to Protoplasmic Plant Anatomy
Example text
Pulcherrima, EMBERGER 1923; S. emelliana, SAPEHIN 1915; I. melanopoda, MA 1928; I. muricata var. braunii, STEWART 1948, Pteridophyta and Gymnosperms 19 DUNLOP 1949; I. macrospora, DUNLOP 1949; I. lacustris, WHATLEY 1974). In Lycopodium, the meristem cells are polyplastidic [L. clava tum with 15-20 plastids, KAJA 1959; L. inundatum (syn. Lepidotis inundata) with "many" plastids, SAPEHIN 1915], as they probably are in Equisetum and Filicatae. A monoplastidic stage (section F. III. ) is passed through during sporogenesis in Selaginella (SAPEHIN 1911, 1915, EMBERGER 1923, YUASA 1961) and Isoetes (SAPEHIN 1911, PETTITT 1976; see also VERMA 1960), as it is in mosses.
The chloroplasts might be passively cut in two by the new cell wall, as assumed by KLOPFER (1934), or they might withdraw from the wall, showing some kind of active division, as held by MUHLDORF (1951). There is no cyclic variation of chloroplast numbers in vegetative cells of Spirogyra. A readjustment of the time of cell division (normally at about midnight) to 42 Developmental Genetics of Plastid Populations another time of the day (STRASBURGER 1880) definitely entrains a readjustment of the time of chloroplast "division".
18 Survey of Known Plastid Numbers per Cell As to the variation within one genus, Mnium provides an example. Seven species varied from 6-20 (M. hornum, BUDDE 1923, SCHRATZ 1927, KAJA 1954) to 190 chloroplasts (M. punctatum, SCHRATZ 1927) per leaflet cell. In Sphagnum, the chlorocytes of branch leaves invariably develop more chloroplasts than those of stem leaves: in S. inundatum the numbers were 33-50 and 15-40, in S. apiculatum 33 and 3-6, in S. squarrosum 46 and 9-16, and in S. girgensohnii 30 and 15, respectively.