臺灣檫樹開花行為與微衛星體基因座之特性分析

蔡永信

doi:10.6342/NTU.2011.01824

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臺灣檫樹開花行為與微衛星體基因座之特性分析

Observations of Flower Biology and Characterization of Microsatellite Loci of Sassafras randaiense

蔡永信 , Masters　　Advisor：鍾國芳　　

繁體中文 DOI： 10.6342/NTU.2011.01824

臺灣檫樹；交配系統；開花行為；雌雄異熟；微衛星體； Sassafras randaiense ； mating system ； flower biology ； dichogamy ； microsatellite

Abstract │ Reference (119) │ Times Cited (1) │ Altmetrics

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Sassafras randaiense (Lauraceae), an ecologically and economically important tree noted as the sole host plant of the highly endangered broad-tailed swallowtail butterfly (Agehana maraho), is a rare and vulnerable endemic species with scattered and isolated populations in the mid elevation forest of Taiwan. Although considerable research efforts had been invested to study and conserve this precious species, silviculture of S. randaiense remains challenging due to its low and variable seed production, deep seed dormancy, and high mortality of seedlings. Recently Chung et al. (Ann. Missouri Bot. Gard. 97: 1-10. 2010) reported that S. randaiense is hermaphroditic and protogynous with a possible sexual system of synchronous dichogamy, rejecting previous accounts claiming polygamy for the species. To test the proposition of synchronous dichogamy that may partially explain its unpredictable seed yield, the reproductive biology of S. randaiense was investigated during its flowering seasons in 2009 and 2010. With the aid of three scaffold observatories in Chilanshan and Taipingshan areas, the sexual phases of 165 inflorescence buds of four trees were recorded and tracked for their entire flowering periods. Photographs were also taken at a one hour interval for selected inflorescences to record the changes of sexual phase and flower visitors. Surprisingly, although our observations confirm the protogyny in S. randaiense, flowers within an individual tree did not change their sexual phase synchronously. Instead the bright and flesh white stigma, signifying the female phase of each flower, lasted for less than 4 days and then became brown and wilted, following by the male phase. For each tree, female phase flowers were present for 8 to 13 days, and at the 7th day, portion of male phase flowers exceeded those of female phase. Based on field observations and interval timing shooting, diptera were the most frequent flower visitors, with moths also being recorded by camera during the night time. Our data clearly show that asynchronous dichogamy better characterizes the sexual system of S. randaiense and geitonogamy is possible with an individual tree.
In addition to the study of reproductive biology, polymorphic microsatellite loci were also isolated and characterized. Of the 14 polymorphic microsatellite loci developed, 8 deviate significantly from Hardy-Weinberg equilibrium. The number of alleles range from 2 to 7 and the average number is 4.07 alleles per locus. Expect heterozygosity ranges from 0.743–0.126 and observe heterozygosity is from 1.000–0.081. Compared to microsatellite genetic variation of other vascular plant species in Taiwan, S. randaiense has much lower low genetic diversity, likely resulted from bottleneck effect or inbreeding commonly observed in tree species of small and isolated population size.

Reference ( 119 ) 〈TOP〉

呂勝由1996。臺灣稀有及瀕危植物之分級彩色圖鑑 (I)。行政院農業委員會。
連結：
吳宜穗 2004。棲蘭山區臺灣檫樹小尺度族群空間遺傳結構分析。國立臺灣大學
連結：
吳森博 2005。宜蘭太平山地區淋殿化土之特性化育與分類。國立臺灣大學農業
連結：
何坤益、蔡忠誠、呂福原 2010。應用 ISSR 分子標誌研究台灣檫樹族群之遺傳
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連結：

Times Cited (1) 〈TOP〉

柯雅青(2015)。臺灣檫樹之遺傳保育學。臺灣大學森林環境暨資源學研究所學位論文。2015。1-72。

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