Nectary and gender-biased nectar production in dichogamous Chamaenerion angustifolium (L.) Scop. (Onagraceae)
| Autor: | Zdzisław Targoński, Sebastian Antoń, Bożena Denisow, Elwira Komoń-Janczara |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
food.ingredient Sucrose Ecology biology fungi food and beverages Fructose Onagraceae Plant Science Photosynthesis biology.organism_classification 010603 evolutionary biology 01 natural sciences Chamaenerion chemistry.chemical_compound food chemistry Anthesis Parenchyma Botany Nectar Ecology Evolution Behavior and Systematics 010606 plant biology & botany |
| Zdroj: | Plant Species Biology. 32:380-391 |
| ISSN: | 0913-557X |
| DOI: | 10.1111/1442-1984.12169 |
| Popis: | In dichogamous plants, nectar characteristics (i.e. nectar amount and its composition) can differ between sexual phases. In the present study, we investigated the structural organization of the floral nectary, nectar production and carbohydrate composition in the protandrous Chamaenerion angustifolium (L.) Scop. (Onagraceae). The receptacular nectary consisted of an epidermis with numerous nectarostomata, several layers of photosynthetic secretory parenchyma, and subsecretory parenchyma. Nectariferous tissue was not directly vascularized and starch grains were rarely observed in the secretory cells, occurring exclusively in the guard cells of modified stomata. The nectar was released via nectarostomata. The floral nectar was hexose rich (32.8/39.1/28.1% glucose/fructose/sucrose) and the total concentration was constant throughout the anthesis (47% on average). However, contrasting patterns in nectar amount and carbohydrate composition between the floral sexual phases were observed. On average, female‐phased flowers produced 1.4‐fold more nectar than male‐phased flowers, and although the nectar was sucrose rich during the male phase, it was hexose rich during the female phase, suggesting sucrose hydrolysis. |
| Databáze: | OpenAIRE |
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