File:Isoetes.reproduction.tif
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[edit]DescriptionIsoetes.reproduction.tif |
English: Reproductive cycle of Isoetes. The diploid sporophyte (A) produces microsporangia and megasporangia, which are located at the leaf bases. A cross section of the plant (B) shows that the megasporangia are located more towards the outer leaves (2) and the microsporangia are concentrated in the center (1). Via meiosis, the sporangia produce haploid spores (C). The megasporangia produce megaspores (3) which become female gametophytes and the microsporangia produce microspores (4) which become male gametophytes. The gametophytes germinate inside the spore, cracking the outer layer known as the perispore (5) as they grow via mitosis to expose the reproductive organs (6). Sperm from the male gametophytes locate the archegonia neck cells on the female gametophyte (6) and swim down to fertilize the egg. A diploid embryo is formed and a young sporophyte (D) is rapidly created through mitosis, eventually growing into another adult sporophyte. |
Date | |
Source |
https://www.flickr.com/photos/47945928@N02/14876472644 http://www.plantsystematics.org/taxpage/0/0/79/family/Isoetaceae.html |
Author | John Game, Robbin Moran, Aidan Harrington |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 21:55, 17 November 2020 | 946 × 1,128 (553 KB) | Ptero-ADH (talk | contribs) | Uploaded a work by John Game, Robbin Moran from https://search.creativecommons.org/photos/1c2f15e5-2805-468d-b99f-698e1c152220 http://www.plantsystematics.org/taxpage/0/0/79/family/Isoetaceae.html with UploadWizard |
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Width | 946 px |
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Height | 1,128 px |
Compression scheme | LZW |
Pixel composition | RGB |
Number of components | 4 |
Number of rows per strip | 3 |
Horizontal resolution | 150 dpi |
Vertical resolution | 150 dpi |
Data arrangement | chunky format |