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篇名
Molecular identification and Morphological traits of the native and exotic Azolla species in Taiwan
並列篇名
Molecular identification and Morphological traits of the native and exotic Azolla species in Taiwan
作者 Mei-Chen Chang (Mei-Chen Chang)Cheng-Tai Huang (Cheng-Tai Huang)Ching-Chu Tsai (Ching-Chu Tsai)高文媛 (Wen-Yuan Kao)
英文摘要
Azolla is a perennial aquatic fern and often forms symbiosis with nitrogen-fixing cyanobacteria. Flora of Taiwan records only one native Azolla species, A. pinnata R. Br., in the Island. Recently, an exotic Azolla species has been documented with naturalized populations in Taiwan and been reported as A. japonica or A. caroliniana. However, data supporting its identity have not been presented. The purposes of this study are: (1) to test the hypothesis that the exotic Azolla species is A. japonica or A. caroliniana, and (2) to illustrate the morphological differences between the exotic and the native Azolla species.
The DNA sequences of four plastid regions, rbcL, atpB, rps4 and rps4-trnS, were generated from plants of the Azolla species growing in different regions of Taiwan. Our phylogenetic analyses reveal that the native species belongs to A. pinnata, while plants of the exotic species are phylogenetically nested within a clad, including A. microphylla. A. mexicana and A. craoliniana. The hostsymbiont specificity between Azolla spp. and their cyanobionts was confirmed by the phylogeny of 16S rRNA genes, which also supports the grouping of the exotic species to the aforementioned clad. Thus, the phylogenetic results suggest that the exotic Azolla is more closely related to A. caroliniana than to A. japonica. A table summarizing the morphological characters of their sporophytes illustrates the differences in the gross form, epidermal structures and surface of rhizome between the native and exotic Azolla species which can be used to differentiate the two species in Taiwan.
起訖頁 382-390
關鍵詞 Aquatic fernAzollaA. carolinianaA. japonicaA. pinnatamolecular identificationsymbiotic cyanobiont
刊名 TAIWANIA  
期數 202009 (65:3期)
出版單位 臺灣大學生命科學院;台灣生物多樣性協會
該期刊-上一篇 Two new species of Kaempferia L. (Zingiberaceae) from Thailand
該期刊-下一篇 Carex pingleensis (Carex sect. Mitratae), a new species of Cyperaceae from Guangxi, China
 

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