碩士 / 國立中興大學 / 農藝學系所 / 94 / Thirty-eight Houttuynia cordata Thunb. accessions collected from Taiwan were used as materials. To understand the cytogenetic variation among collected accessions, Chromosome number, pollen formation and the pollen fertility of collection accessions were surveyed.
The analysis result indicates that the chromosome number of 38 accessions is ranged from 63 to 90 as same as septuploid, octoploid, enneaploid and decaploid, respective. Included aneuploid with 84 and 85 chromosome. Aneuploid offspring collected from Cheng-gong and euploid offspring collected from Suao both seeded in aneuploid and euploid. In the meiosis process of pollen mother cell, unequal chromosomal segregation and abnormal cytokinesis generated abnormal sporads. Otherwise, I observed the occurrence of cytomixis in pollen mother cell at microspore period. Cytomixis of the frequency among accessions were ranged from 14.25 % to 6.69 %, especially the frequence of accessions collected from Cheng-gong is highest (14.21 %). Pollen fertility of the frequency among accessions were ranged from 4.25 % to 0.19 %, especially the frequence of accessions collected from Taipei II is highest (4.25 %).
Finally, the analysis results supports that the variation of chromosome number among 38 assessions collected of H. cordata Thunb. is probably caused by abnormal meiosis and cytomixis.
| Identifer | oai:union.ndltd.org:TW/094NCHU5417004 |
| Date | January 2006 |
| Creators | Shen-Yi Chiang, 江守懿 |
| Contributors | 胡澤寛 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 40 |
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