Disintegration of chloroplasts during zygote formation in Spirogyra verruculosa
Identifieur interne : 001497 ( Istex/Curation ); précédent : 001496; suivant : 001498Disintegration of chloroplasts during zygote formation in Spirogyra verruculosa
Auteurs : Shigeru OgawaSource :
- The botanical magazine = Shokubutsu-gaku-zasshi [ 0006-808X ] ; 1982-09-01.
Abstract
Abstract: The chloroplast disintegration during zygote maturation inSpirogyra verruculosa was investigated by electron microscopy. In the seven-day-old zygote about half of the chloroplasts commenced to disintegrate and to turn yellow, losing starch grains, and, then, were torn into fragments of various sizes, which had mostly vesiculated thylakoids and plastoglobules increasing in both size and number. At about two weeks after conjugation, in the cytoplasm, electron-dense structures, linear in section, appeared and vacuoles of various sizes developed. Each of the dense linear structures lying around a fragment seemed to form a cavity of crescent shape in section, and these cavities fused mutually into a large one, leading to the separation of the fragment from the bulk of cytoplasm. The vacuoles seemed to be, involved in the sequestration of the fragments by their fusion with the cavities and by the invagination, of tonoplast. The fragments entrapped by the vacuoles were rapidly broken down into the aggregation of residual membrane pieces, plastoglobules, and undigested starch grains. The maintained chloroplasts changed little in structure compared with the chloroplast of the vegetative cell, and were transmitted to the germling. It is suggested that the eliminated chloroplasts are derived exclusively from the male gamete.
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DOI: 10.1007/BF02488537
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Shigeru Ogawa<affiliation><mods:affiliation>Biological Institute, Faculty of Science, Tohoku University, 980, Sendai</mods:affiliation><wicri:noCountry code="subField">Sendai</wicri:noCountry></affiliation>Le document en format XML
<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Disintegration of chloroplasts during zygote formation in Spirogyra verruculosa</title><author><name sortKey="Ogawa, Shigeru" sort="Ogawa, Shigeru" uniqKey="Ogawa S" first="Shigeru" last="Ogawa">Shigeru Ogawa</name><affiliation><mods:affiliation>Biological Institute, Faculty of Science, Tohoku University, 980, Sendai</mods:affiliation><wicri:noCountry code="subField">Sendai</wicri:noCountry></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:393EF1C34A092530B5C53749478B84CCD934AD09</idno><date when="1982" year="1982">1982</date><idno type="doi">10.1007/BF02488537</idno><idno type="url">https://api.istex.fr/document/393EF1C34A092530B5C53749478B84CCD934AD09/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001497</idno><idno type="wicri:Area/Istex/Curation">001497</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Disintegration of chloroplasts during zygote formation in Spirogyra verruculosa</title><author><name sortKey="Ogawa, Shigeru" sort="Ogawa, Shigeru" uniqKey="Ogawa S" first="Shigeru" last="Ogawa">Shigeru Ogawa</name><affiliation><mods:affiliation>Biological Institute, Faculty of Science, Tohoku University, 980, Sendai</mods:affiliation><wicri:noCountry code="subField">Sendai</wicri:noCountry></affiliation></author></analytic><monogr></monogr><series><title level="j">The botanical magazine = Shokubutsu-gaku-zasshi</title><title level="j" type="sub">Botanical Society of Japan</title><title level="j" type="abbrev">Bot Mag Tokyo</title><idno type="ISSN">0006-808X</idno><idno type="eISSN">1618-0860</idno><imprint><publisher>Springer-Verlag</publisher><pubPlace>Tokyo</pubPlace><date type="published" when="1982-09-01">1982-09-01</date><biblScope unit="volume">95</biblScope><biblScope unit="issue">3</biblScope><biblScope unit="page" from="249">249</biblScope><biblScope unit="page" to="260">260</biblScope></imprint><idno type="ISSN">0006-808X</idno></series><idno type="istex">393EF1C34A092530B5C53749478B84CCD934AD09</idno><idno type="DOI">10.1007/BF02488537</idno><idno type="ArticleID">BF02488537</idno><idno type="ArticleID">Art4</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0006-808X</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: The chloroplast disintegration during zygote maturation inSpirogyra verruculosa was investigated by electron microscopy. In the seven-day-old zygote about half of the chloroplasts commenced to disintegrate and to turn yellow, losing starch grains, and, then, were torn into fragments of various sizes, which had mostly vesiculated thylakoids and plastoglobules increasing in both size and number. At about two weeks after conjugation, in the cytoplasm, electron-dense structures, linear in section, appeared and vacuoles of various sizes developed. Each of the dense linear structures lying around a fragment seemed to form a cavity of crescent shape in section, and these cavities fused mutually into a large one, leading to the separation of the fragment from the bulk of cytoplasm. The vacuoles seemed to be, involved in the sequestration of the fragments by their fusion with the cavities and by the invagination, of tonoplast. The fragments entrapped by the vacuoles were rapidly broken down into the aggregation of residual membrane pieces, plastoglobules, and undigested starch grains. The maintained chloroplasts changed little in structure compared with the chloroplast of the vegetative cell, and were transmitted to the germling. It is suggested that the eliminated chloroplasts are derived exclusively from the male gamete.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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