https://scholars.lib.ntu.edu.tw/handle/123456789/137724
Title: | Can Ethylene Induce Heterophyll in Marsilea quadrifolia? 乙烯是否可以誘導田字草?形?的形成 |
Authors: | ?家弘 ?白翎 高文媛 Lin, C.H. Lin, B.L. Kao, W.Y. |
Keywords: | amphibious fern;ethylene;floating leaves;heterophyll;M. quadrifolia;stomatal ratio;水??棲蕨?;乙烯;浮水?;?形?;田字草;氣孔比 | Issue Date: | Sep-2008 | Journal Volume: | 53 | Journal Issue: | 3 | Start page/Pages: | 237-241 | Source: | Taiwania | Abstract: | Individuals of Marsilea quadrifolia, an amphibious fern, experiencing xtreme variations in environment develop heterophyll with different morphological haracteristics. The objective of this study is to investigate if ethylene can induce floating type of leaves in his fern. To achieve this goal, ratio of stomatal density on abaxial and adaxial leaf surfaces (stomatal atio) and the mass per unit length of petiole (PML), on leaves of terrestrial shoots sprayed with an ethylene as releaser, Ethephon, were compared with those of leaves produced by submergence of terrestrial hoots. Leaves with different stomatal ratio and PML, corresponding to that of terrestrial type and loating type of leaves, were produced when terrestrial shoots of M. quadrifolia were submerged. The esult reveals that the plasticity of leaves to respond to submergence depends on leaf’s age. Application of thephon significantly altered the stomatal ratio of young leaves on terrestrial shoot but not their PML. eaves response to Ethephon treatment was also age dependent. These results indicate that ethylene ight be involved in the formation of floating leaves in M. quadrifolia. 田字草是一種水??棲的蕨?,在?同環境下會長出?形?,這些?形?具?同的形態特徵。本研究目的在探討乙烯氣體是否可以誘導田字草浮水?的形成。我們比較?生植株經淹水後、以及噴灑Ethephon (會釋出乙烯氣體) 後,?同?齡的?片其上、下表皮氣孔密?比和?柄單位長?重?比。結果發現?生環境下長出的?子經淹水後能否轉變成浮水?特徵和其?齡有關,較?的?子維持?生?特徵(較高的下/上表皮氣孔比和較重的?柄單位長?重?比),幼?則可以轉而形成浮水?特徵(較低的下/上表皮氣孔比和較輕的?柄單位長?重?比),而淹水後才新長出的?片具浮水?特徵。?生植株噴灑Ethephon 後有些原已形成的?子其氣孔比是否會轉變成傾向浮水?特徵也和其?齡有關;?柄單位長?重?比則?受Ethephon 噴灑的影響,仍維持?生?特徵。結果顯示乙烯氣體可以誘導田字草改變?子的部份特徵,此可能和浮水?的形成有關。 |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/283446 http://ntur.lib.ntu.edu.tw/bitstream/246246/283446/1/5303_200809_1.pdf |
DOI: | 10.6165/tai.2008.53(3).236 |
Appears in Collections: | 生命科學系 |
File | Description | Size | Format | |
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5303_200809_1.pdf | 2.81 MB | Adobe PDF | View/Open |
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