臺灣兩種滿江紅的鑑定、生理特徵及生長探討

張渼晨

doi:10.6342/NTU201700476

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台湾两种满江红的监定、生理特徵及生长探讨

Identity, physiological traits and growth of two Azolla species in Taiwan

张渼晨 , 硕士　　导师：高文媛　　

繁体中文 DOI： 10.6342/NTU201700476

满江红；共生固氮蓝绿菌；相对生长速率；比叶面积；光合作用氮使用效率；花青素；光抑制； Azolla ； cyanobionts ； relative growth rate ； photosynthetic nitrogen use efficiency ； specific leaf area ； anthocyanin ； photoinhibition

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摘要 │ 参考文献 (142) │ 国际计量

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Azolla, a perennial and floating aquatic fern, often forms symbiosis with nitrogen-fixing cyanobacteria and turns red under stress. One native Azolla species (A. pinnata R. Br.) was recorded in Flora of Taiwan. Recently, a naturalized Azolla species is commonly found in field and becomes more dominant than the native species. The identity of the naturalized species is unknown. The aims of this study are: (I) to compare the morphological traits and to identify the two Azolla species in Taiwan by molecular tool, (II) to compare their cyanobacterial symbionts, and (III) to figure out what make the naturalized species becomes more dominant than the native species. The plant shape of the native and naturalized species are triangular and polygonal, respectively. The SEM observation of the upper lobe of leaves revealed that the native species had larger stomatal pore length and higher trichome density than the naturalized species. These imply that the native species might have higher stomatal conductance and reflect more light than the naturalized species, therefore may impact on the photosynthetic rate and the level of photoinhibition. The DNA sequence data of four plastid loci of the two Azolla species sampled from different populations revealed that the native and naturalized species belong to A. pinnata and MIC-MEX complex, respectively. Results of the analysis of 16S rRNA genes suggest that two species harbored different species of cyanobionts, but different populations of the same Azolla species formed symbiosis with same cyanobionts. Thus, host-symbiont specificity in Azolla and cyanobionts was found. Growth of the two Azolla spp. in NTU paddy field in different seasons under two light treatments (full sun and 70 % reduction of light) were measured. Under the same light treatment, two species had similar photosynthetic gas exchange traits, but the naturalized species was more photoinhibited than the native species (A. pinnata). In comparision to A. pinnata, the naturalized species had higher relative growth rate (RGR) in winter and fall of 2015. Besides, the naturalized species had higher specific leaf area (SLA) and higher photosynthetic nitrogen use efficiency (PNUE) than A. pinnata respectively in winter and and fall of 2015. Accordingly, resource use efficiency might contribute to the differences in RGR of both species.

参考文献 ( 142 ) 〈TOP〉

蔡佳娟 (2010) 两种满江红花青素生成与PSII光化学效能之研究，国立台湾大学生态学与演化生物学研究所硕士论文。
连结：
Ahad, B., Z. A. Reshi, A. H. Ganaie and A. R. Yousuf. 2012. Azolla cristata in the Kashmir Himalaya. American Fern Journal 102: 224-227.
连结：
Alves, P. L. d. C. A., A. C. N. Magalhães and P. R. Barja. 2002. The phenomenon of photoinhibition of photosynthesis and its importance in reforestation. The Botanical Review 68: 193-208.
连结：
Arendonk, J. J. C. M., G. J. Niemann, J. J. Boon and H. Lambers. 1997. Effects of nitrogen supply on the anatomy and chemical composition of leaves of four grass species belonging to the genus Poa, as determined by image‐processing analysis and pyrolysis–mass spectrometry. Plant, Cell and Environment 20: 881-897.
连结：
Baruch, Z. and G. Goldstein. 1999. Leaf construction cost, nutrient concentration, and net CO2 assimilation of native and invasive species in Hawaii. Oecologia 121: 183-192.
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使用DOI作为永久连结

引用含有DOI的文献

DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。 如想对DOI的使用与概念有进一步了解，请参考 （ ） 。

DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。如想对DOI的使用与概念有进一步了解，请参考（）。