Samara water absorption and floatation in sheoaks, <em>Casuarina</em> and <em>Allocasuarina</em> (Casuarinaceae)
Diaspores (samaras) of the sheoaks, Casuarina and Allocasuarina, have a mesocarp composed of hydrophilic fibres that, in Allocasuarina, rapidly expand on wetting, capturing significant quantities of water. The ecological function of this water capturing has been the subject of speculation but not q...
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| Format: | Article |
| Language: | English |
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PAGEPress Publications
2022-03-01
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| Series: | Natural History Sciences |
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| Online Access: | https://sisn.pagepress.org/index.php/nhs/article/view/541 |
| _version_ | 1819121527276175360 |
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| author | Ian T. Riley Moin Qureshi |
| author_facet | Ian T. Riley Moin Qureshi |
| author_sort | Ian T. Riley |
| collection | DOAJ |
| description |
Diaspores (samaras) of the sheoaks, Casuarina and Allocasuarina, have a mesocarp composed of hydrophilic fibres that, in Allocasuarina, rapidly expand on wetting, capturing significant quantities of water. The ecological function of this water capturing has been the subject of speculation but not quantification or experimentation. Therefore, the rate and quantity of water absorbed, and the floatation properties of samaras of accessions of Casuarina and Allocasuarina were assessed. Casuarina absorbed water slowly (~48 h) with median absorption of 90% (by weight) whereas Allocasuarina absorbed water rapidly (<2 min) with median absorption of 240%. The process was reversible and increasing in Allocasuarina, with median absorption reaching 400% over three to five wetting/drying cycles. The floating half-life of Casuarina and Allocasuarina samaras overlapped, 17-70 and 29-57 h, respectively, so Casuarina samaras were not shown to be better adapted to hydrochory. Based on five accessions of each genus, it does not be appear that water-capturing of sheoak samaras is directly related to habitat aridity, nor to potential hydrochory. Therefore, the ecological implications of differential water-capturing of sheoak samaras remains to be determined.
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| format | Article |
| id | doaj.art-dfb493d663554819a702b3b5ddc106fc |
| institution | Directory Open Access Journal |
| issn | 2385-0442 2385-0922 |
| language | English |
| last_indexed | 2024-12-22T06:37:58Z |
| publishDate | 2022-03-01 |
| publisher | PAGEPress Publications |
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| series | Natural History Sciences |
| spelling | doaj.art-dfb493d663554819a702b3b5ddc106fc2022-12-21T18:35:32ZengPAGEPress PublicationsNatural History Sciences2385-04422385-09222022-03-019110.4081/nhs.2022.541Samara water absorption and floatation in sheoaks, <em>Casuarina</em> and <em>Allocasuarina</em> (Casuarinaceae)Ian T. Riley0Moin Qureshi1Department of Plant Production and Technologies, Faculty of Agricultural Science and Technologies, Niğde Omer Halisdemir University, NiğdeDepartment of Plant Production and Technologies, Faculty of Agricultural Science and Technologies, Niğde Omer Halisdemir University, Niğde Diaspores (samaras) of the sheoaks, Casuarina and Allocasuarina, have a mesocarp composed of hydrophilic fibres that, in Allocasuarina, rapidly expand on wetting, capturing significant quantities of water. The ecological function of this water capturing has been the subject of speculation but not quantification or experimentation. Therefore, the rate and quantity of water absorbed, and the floatation properties of samaras of accessions of Casuarina and Allocasuarina were assessed. Casuarina absorbed water slowly (~48 h) with median absorption of 90% (by weight) whereas Allocasuarina absorbed water rapidly (<2 min) with median absorption of 240%. The process was reversible and increasing in Allocasuarina, with median absorption reaching 400% over three to five wetting/drying cycles. The floating half-life of Casuarina and Allocasuarina samaras overlapped, 17-70 and 29-57 h, respectively, so Casuarina samaras were not shown to be better adapted to hydrochory. Based on five accessions of each genus, it does not be appear that water-capturing of sheoak samaras is directly related to habitat aridity, nor to potential hydrochory. Therefore, the ecological implications of differential water-capturing of sheoak samaras remains to be determined. https://sisn.pagepress.org/index.php/nhs/article/view/541AllocasuarinaCasuarinadiasporefloatationhydrochorysamara |
| spellingShingle | Ian T. Riley Moin Qureshi Samara water absorption and floatation in sheoaks, <em>Casuarina</em> and <em>Allocasuarina</em> (Casuarinaceae) Natural History Sciences Allocasuarina Casuarina diaspore floatation hydrochory samara |
| title | Samara water absorption and floatation in sheoaks, <em>Casuarina</em> and <em>Allocasuarina</em> (Casuarinaceae) |
| title_full | Samara water absorption and floatation in sheoaks, <em>Casuarina</em> and <em>Allocasuarina</em> (Casuarinaceae) |
| title_fullStr | Samara water absorption and floatation in sheoaks, <em>Casuarina</em> and <em>Allocasuarina</em> (Casuarinaceae) |
| title_full_unstemmed | Samara water absorption and floatation in sheoaks, <em>Casuarina</em> and <em>Allocasuarina</em> (Casuarinaceae) |
| title_short | Samara water absorption and floatation in sheoaks, <em>Casuarina</em> and <em>Allocasuarina</em> (Casuarinaceae) |
| title_sort | samara water absorption and floatation in sheoaks em casuarina em and em allocasuarina em casuarinaceae |
| topic | Allocasuarina Casuarina diaspore floatation hydrochory samara |
| url | https://sisn.pagepress.org/index.php/nhs/article/view/541 |
| work_keys_str_mv | AT iantriley samarawaterabsorptionandfloatationinsheoaksemcasuarinaemandemallocasuarinaemcasuarinaceae AT moinqureshi samarawaterabsorptionandfloatationinsheoaksemcasuarinaemandemallocasuarinaemcasuarinaceae |