Cytotaxonomical Studies of South Indian Scrophulariaceae
Cytotaxonomical Studies of South Indian Scrophulariaceae
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南印度玄参科的细胞分类学研究
DOI：
10.1508/cytologia.52.529
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
R. Pondmudi
中科院分区：
文献类型：
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作者：
D. Subramanian;R. Pondmudi
对印度南部玄参科17属21种植物的染色体数目进行了研究，其中异叶山茱萸、楔叶山茱萸、细叶Ilysanthes tenuifolia、I. oppositifolia、Micrargeria wightii和Sophulia trfda。本研究所测定的染色体数目范围为2n=12 ~ 20= 80。本研究所测定的染色体数目和以前在该家系中报道的染色体数目（Fedorov 1974）表明，在n=6 ~ 84之间存在一个连续的基数序列。族中最常见的基数是n=8，并假定它是族的原始基数。在该科的早期进化中，染色体数目的非整倍体变化产生了n=6，7，8，9，10，11，12，13和14的基数，在此之后，多倍体和二元双二倍体产生了较高的基数（n=17 ~ n=84），核型也有明显的差异，表明核DNA在进化过程中发生了变化。17种植物减数分裂染色体数目与有丝分裂染色体数目基本一致。多价体和四价体的存在沿着与二价体和存在的失语落后者和桥和三倍体后期的证据支持的非整倍体和多倍体的性质的物种。
The chromosome number of 21 species belonging to 17 genera of Scrophulariaceae from South India has been studied, of which first record of chromosome has been made in Lymnophila heterophylla, Moniera cuneifolia, Ilysanthes tenuifolia, I. oppositifolia, Micrargeria wightii and Sopulia trfda. Chromosome numbers determined in the present study range from 2n=12 to 20=80.Chromsome numbers determined in the present study and those reported previously in the family (Fedorov 1974) reveal the presence of a continuous series of basic number between n=6 to 84. The commonest basic number in the famly is n=8 and it is assumed to be the original basic number of the family. It appears that aneuploid changes of chromosome numbers produced the basic numbers of n=6, 7, 8, 9, 10, 11, 12, 13 and 14 in the early evolution of the family, after which polyploid and dibasic amphidiploid gave rise to the higher basic numbers (n=17 to n=84) now found in the family.Karyotypes in the family also show differences in absolute chromosome size indicating changes in nuclear DNA in evolution. The meiotic chromosome number studied in 17 species is in confirmation with the mitotic chromosomes. The presence of mutivalents and quadrivalents along with bivalents and the presence of anaphasic laggards and bridges and triplar anaphases show evidences in support of the aneuploid and polyploid nature of the species.