| 濒危植物巴东木莲花粉母细胞减数分裂观察 |
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| 引用本文： | 何子灿,李晓东,李建强.濒危植物巴东木莲花粉母细胞减数分裂观察[J].中国科学院研究生院学报,2005,1(6):526-532. |
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| 作者姓名： | 何子灿 李晓东 李建强 |
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| 作者单位： | (中国科学院武汉植物园 武汉 430074) |
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| 摘 要： | 对巴东木莲Manglietia patungensis及其近缘种乳源木莲M. yuyuanensis的花粉母细胞减数分裂过程的基本特征进行了比较研究。乳源木莲与巴东木莲的染色体数目和核型相同,但不经任何人为因素诱导,它们之间在减数分裂过程中的染色体行为上有明显差异。(1)巴东木莲减数分裂中期I构型为0.30IV+18.33II+0.15I,与乳源木莲构型19II不同,巴东木莲可能存在同臂内倒位杂合子,染色体结构存在一定的杂合性。(2)后期I和后期II染色体行为异常现象发生频率明显不同。以后期II为例,乳源木莲减数分裂相中有迟滞染色体的细胞占8.8%,迟滞染色体不超过2个;巴东木莲有迟滞染色体等异常现象的细胞占29.2%,迟滞染色体最高达11个,还出现染色体碎裂成断片现象。巴东木莲减数分裂过程中染色体组表现出染色体结构杂合变异和迟滞染色体与染色体的断裂频率很高的异常现象在一定程度上可能影响了雄配子体的发育。
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| 关 键 词： | 巴东木莲 乳源木莲 濒危物种 减数分裂 |
| 收稿时间： | 2004-10-19 |
| 修稿时间： | 2005-07-05 |
Meiotic observations on the pollen mother cells of Manglietia patungensis, an endangered species |
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| HE Zi-Can,LI Xiao-Dong,LI Jian-Qiang.Meiotic observations on the pollen mother cells of Manglietia patungensis, an endangered species[J].Journal of the Graduate School of the Chinese Academy of Sciences,2005,1(6):526-532. |
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| Authors: | HE Zi-Can LI Xiao-Dong LI Jian-Qiang |
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| Institution: | (Wuhan Botanical Garden, the Chinese Academy of Sciences, Wuhan 430074, China) |
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| Abstract: | A comparative study of meiosis of pollen mother cells in Manglietia patungensis Hu and its closely related species M. yuyuanensis Law was carried out. These two species had the same chromosome number of 2n=38 and the same karyotype, but their chromosomal behaviors in meiosis were different. In M. patungensis, the typical chromosome configurations observed at metaphase were 2n=0.30IV+18.33II+0.15I, whereas those in M. yuyuanensis were 2n=19II, indicating that some chromosomes in M. patungensis might have undergone inversion and that some chromosome components were possibly paracentric inversion heterozygotes. The abnormal rate of chromosomal behaviors at anaphase I and II was different in the two species. At anaphase II, 8.8% cells were observed with lagging chromosomes which in each cell did not exceed two in M. yuyuanensis, but in M. patungensis, 29.2% cells were observed with lagging chromosomes which could reach 11 in each cell. Additionally, broken chromosomes were observed in M. patungensis. The above results indicate that the abnormal rate of chromosomal behaviors in the meiosis of M. patungensis was higher than that in M. yuyuanensis. The abnormal behaviors of the chromosomes in meiosis observed in M. patungensis may have affected the development of pollen grains in this species. |
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| Keywords: | Manglietia patungensis Manglietia yuyuanensis endangered species meiosis |
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