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초록제목 Does cytotype variation reflect changes in micromorphological features in the Barnardia japonica complex?
초록

Does cytotype variation reflect changes in micromorphological features in the Barnardia japonica complex?

 

Hyeonjin KimP1†, Bokyung Choi1†, Hanna Weiss-Schneeweiss2*, Changyoung Lee3, Jin-Hyub Paik3, Tae-Soo Jang1*

*Correspondence to be sent to: hanna.schneeweiss@univie.ac.at & jangts@cnu.ac.kr

These authors contributed equally to this work

 

1Department of Biological Science, College of Bioscience and Biotechnology, Chungnam National University, Daejeon 34134, Republic of Korea; 2Department of Botany and Biodiversity Research, University of Vienna, Rennweg 14, A-1030 Vienna, Austria; 3International Biological Material Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Republic of Korea

 

Polyploidization is regarded as one of the important processes contributing to plant speciation and diversification. Although polyploidy is particularly common in flowering plants, comparative data to understand the polyploid genome evolution are limited to several plant groups. The Barnardia japonica complex, distributed in Eastern Asia, exhibits exceptionally high levels of chromosomal variation, with two different base chromosome numbers of x = 8 and 9 (AA and BB cytotypes). Although polymorphic chromosome variants have been found, these cytotypes are morphologically subtly differentiated. Here we present a comparative study of leaf and pollen micromorphological characters in both diploids and their allopolyploids of the B. japonica complex using LM (light microscope) and SEM (scanning electron microscope). All cytotypes examined in the B. japonica complex had amphistomatic leaves with anomocytic stomatal complexes. The stomatal size ranges from 22.97 ?m in BB cytotype to 31.59 ?m in AA cytotype, and the cuticle striation of the leaf epidermis was the most prominent AA cytotype while the BB cytotype has the weakest cuticle striation, followed by AABB cytotype. Pollens of all cytotypes in the B. japonica complex are monosulcate and have perforate tectum with a similar diameter of perforations on the exine. However, the pollen size had a positive correlation with ploidy levels. The range of the longest axis varied from 36.31 ?m in AA cytotype to 47.78 ?m in AABB allopolyploidy in the B. japonica complex. Although some micromorphological differences were found, it is not sufficient to distinguish the different cytotypes into separate taxa within the Barnardia japonica complex based on the current leaf and pollen micromorphology. 

발표자료 2021_Kim et al_Barnardia japonica.pdf
초록 2021_Kim et al_Barnardia japonica.doc
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이메일 jangts@cnu.ac.kr

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