THE DEVELOPMENT OF TWIN EMBRYO SACS, EMBRYOS, AND ENDOSPERM IN POA ARCTICA R. BR.
The origin and development of twin embryo sacs especially in P. arctica R. Br. were studied microscopically in sections of whole spikelets representing consecutive stages in development from the time of emergence of the panicle until after pollination. Twin embryo sacs usually develop, one originati...
Published in: | Canadian Journal of Research |
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Language: | English |
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Canadian Science Publishing
1941
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Online Access: | http://dx.doi.org/10.1139/cjr41c-018 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjr41c-018 |
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crcansciencepubl:10.1139/cjr41c-018 2023-12-17T10:31:00+01:00 THE DEVELOPMENT OF TWIN EMBRYO SACS, EMBRYOS, AND ENDOSPERM IN POA ARCTICA R. BR. Engelbert, V. 1941 http://dx.doi.org/10.1139/cjr41c-018 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjr41c-018 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Research volume 19c, issue 5, page 135-144 ISSN 1923-4287 Pharmacology (medical) Complementary and alternative medicine Pharmaceutical Science journal-article 1941 crcansciencepubl https://doi.org/10.1139/cjr41c-018 2023-11-19T13:38:30Z The origin and development of twin embryo sacs especially in P. arctica R. Br. were studied microscopically in sections of whole spikelets representing consecutive stages in development from the time of emergence of the panicle until after pollination. Twin embryo sacs usually develop, one originating from the innermost of a row of four macrospores with the reduced chromosome number, the other from an aposporous cell that originates in the nucellus, near the chalaza and behind the normal archespore. The individual development of the normal and aposporous embryo sacs from their respective mother cells is traced and the competition between them discussed. Both aposporous and normal egg cells develop parthenogenetically. Pollen germination appears to activate the aposporous polar cell to form endosperm which in turn nourishes the aposporous (2n) and (or) the "sexual" (n) embryo. The greatest number of plants originate from the aposporous embryo. A type of apospory was found in P. alpina L. from Greenland. The work of other investigators, especially on P. pratensis L. is reinterpreted in the light of these findings. Article in Journal/Newspaper Greenland Canadian Science Publishing (via Crossref) Greenland Canadian Journal of Research 19c 5 135 144 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Pharmacology (medical) Complementary and alternative medicine Pharmaceutical Science |
spellingShingle |
Pharmacology (medical) Complementary and alternative medicine Pharmaceutical Science Engelbert, V. THE DEVELOPMENT OF TWIN EMBRYO SACS, EMBRYOS, AND ENDOSPERM IN POA ARCTICA R. BR. |
topic_facet |
Pharmacology (medical) Complementary and alternative medicine Pharmaceutical Science |
description |
The origin and development of twin embryo sacs especially in P. arctica R. Br. were studied microscopically in sections of whole spikelets representing consecutive stages in development from the time of emergence of the panicle until after pollination. Twin embryo sacs usually develop, one originating from the innermost of a row of four macrospores with the reduced chromosome number, the other from an aposporous cell that originates in the nucellus, near the chalaza and behind the normal archespore. The individual development of the normal and aposporous embryo sacs from their respective mother cells is traced and the competition between them discussed. Both aposporous and normal egg cells develop parthenogenetically. Pollen germination appears to activate the aposporous polar cell to form endosperm which in turn nourishes the aposporous (2n) and (or) the "sexual" (n) embryo. The greatest number of plants originate from the aposporous embryo. A type of apospory was found in P. alpina L. from Greenland. The work of other investigators, especially on P. pratensis L. is reinterpreted in the light of these findings. |
format |
Article in Journal/Newspaper |
author |
Engelbert, V. |
author_facet |
Engelbert, V. |
author_sort |
Engelbert, V. |
title |
THE DEVELOPMENT OF TWIN EMBRYO SACS, EMBRYOS, AND ENDOSPERM IN POA ARCTICA R. BR. |
title_short |
THE DEVELOPMENT OF TWIN EMBRYO SACS, EMBRYOS, AND ENDOSPERM IN POA ARCTICA R. BR. |
title_full |
THE DEVELOPMENT OF TWIN EMBRYO SACS, EMBRYOS, AND ENDOSPERM IN POA ARCTICA R. BR. |
title_fullStr |
THE DEVELOPMENT OF TWIN EMBRYO SACS, EMBRYOS, AND ENDOSPERM IN POA ARCTICA R. BR. |
title_full_unstemmed |
THE DEVELOPMENT OF TWIN EMBRYO SACS, EMBRYOS, AND ENDOSPERM IN POA ARCTICA R. BR. |
title_sort |
development of twin embryo sacs, embryos, and endosperm in poa arctica r. br. |
publisher |
Canadian Science Publishing |
publishDate |
1941 |
url |
http://dx.doi.org/10.1139/cjr41c-018 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjr41c-018 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Canadian Journal of Research volume 19c, issue 5, page 135-144 ISSN 1923-4287 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjr41c-018 |
container_title |
Canadian Journal of Research |
container_volume |
19c |
container_issue |
5 |
container_start_page |
135 |
op_container_end_page |
144 |
_version_ |
1785584138566238208 |