臺灣的新歸化物種－裂葉月見草Oenothera laciniata Hill（Onagraceae）的遺傳變異分布情形

Allozyme Variation of a Newly Naturalized Weed, Oenothera lacianiata Hill (Onagraceae) of Taiwan

陳燕珍(Yen-Jen Chen) ； 陳進霖(Chin-Lin Chen) ； 黃生(Shong Huang)

《師大生物學報》 32卷1期 (1997/06) Pp. 33-41

https://doi.org/10.29812/BBNTNU.199706.0006

摘要

Oenothera laciniata Hill, one of the rapid expanded exotic weed, was found of restricted distribution initially in northern Taiwan. It had been reported in the sandy coast of Taoyuan and I-Lan counties, but has since been invading rapidly along the coastaline highway and the mountain traits. Patterns of genetic variation were studied at 15 isozyme loci in five sampled populations. Realitively low percentage of polymorphic loci (12.0%) and mean heterozygosity (0.062) indicated little of genetic variability across loci in overall populations. Based on inbreeding estimation, O. lacianata was found nearly complete outcrossing. Moderate population differentiation (FST=0.102) was existed among populations for three polymorphic loci. Results of genetic diversity analysis indicated that nearly 91% of total variation was distributed within populations (GST=0.09). This suggests a lack of barriers to gene flow among populations. The parameter of genetic distance (D) showed population divergence was low between populations (D＜0.05) and to be identity in eastern Taiwanese populations (D=0.00). Moreover, linkage disequilibrium was found merely present in the Taoyuan population. However, since O. laciniata is a newly naturalized species, the founder's effect as well as the isolation between eastern and western local populations, may play roles on the differentiation between populations.

關鍵字

裂葉月見草 ； 族群遺傳變異 ； 同功酶 ； 先驅者效應 ； 連鎖不平衡

並列摘要

Oenothera laciniata Hill, one of the rapid expanded exotic weed, was found of restricted distribution initially in northern Taiwan. It had been reported in the sandy coast of Taoyuan and I-Lan counties, but has since been invading rapidly along the coastaline highway and the mountain traits. Patterns of genetic variation were studied at 15 isozyme loci in five sampled populations. Realitively low percentage of polymorphic loci (12.0%) and mean heterozygosity (0.062) indicated little of genetic variability across loci in overall populations. Based on inbreeding estimation, O. lacianata was found nearly complete outcrossing. Moderate population differentiation (FST=0.102) was existed among populations for three polymorphic loci. Results of genetic diversity analysis indicated that nearly 91% of total variation was distributed within populations (GST=0.09). This suggests a lack of barriers to gene flow among populations. The parameter of genetic distance (D) showed population divergence was low between populations (D＜0.05) and to be identity in eastern Taiwanese populations (D=0.00). Moreover, linkage disequilibrium was found merely present in the Taoyuan population. However, since O. laciniata is a newly naturalized species, the founder's effect as well as the isolation between eastern and western local populations, may play roles on the differentiation between populations.

並列關鍵字

Oenothera laciniata ； Isozyme ； Population genetic variation ； Founder's effect ； Linkage disequilibrium