臺灣國際科展

稀子蕨的生殖策略探討

科展類別
臺灣國際科展
屆次
2003年
科別
植物學
學校名稱
台北市立第一女子高級中學
指導老師
陳怡旴
作者
許韶芸
關鍵字
稀子蕨、不定芽、物候學、 Monachosorum henryi、adventious buds、phenology \r\n
備註
柯達公司攝影獎

摘要或動機

稀子蕨(Monachosorum henryi Christ)生長在台灣中海拔山區,是少數具有特殊生殖方式(不定芽)的蕨類。本研究對東眼山的稀子蕨族群進行物候調查,以了解其進行孢子繁殖及不定芽繁殖的過程,並試圖探討稀子蕨的不定芽是否可增加其族群對環境的適應性。研究結果顯示稀子蕨的孢子體及原葉體都無法在乾旱的環境下生存,常有大規模乾死的現象;而其不定芽則具有很強的耐旱性,無論是在季節普遍性及幼苖發育程度上,生殖芽都比孢子繁殖較佔優勢。而且其不定芽於旱季結束後,可迅速萌發,長出的孢子葉可隨之進行有性(孢子)及無性(不定芽)生殖,使其族群不至於在旱季中有地區性滅絕之虞。;Monachosorum henryi Christ , which exists in the middle elevations of the mountainous regions of Taiwan, is a fern with a special reproductive system seldom found in other ferns.This study investigates the phenology of Monachosorum henryi population in the Don Yang mountain region. Its purpose is to understand the sexual and asexual reproductive cycles of these ferns and to interpret whether or not the buds can increase the fitness of their population during the dry season.The results show that it is extremely difficult for the sporophyte and prothallus of Monachosorum henryi to survive in a drought. However, the buds have a much stronger drought endurance. According to this investigation, the adventitious buds of Monachosorum henryi are superior to the spores in seedling development in every season. Adventitious buds are able to germinate soon after the dry season as well as in any other season, and are able to grow spores and buds on their fronds enabling both a sexual and asexual way of proliferation. In this way the fern avoids a district extinction of their population.


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