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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Heterochromatin characterization through differential fluorophore binding pattern in some species of Vigna Savi
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Heterochromatin characterization through differential fluorophore binding pattern in some species of Vigna Savi

机译：通过不同的荧光团结合模式在Vigna Savi的某些物种中的异染色质表征

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摘要

Heterochromatin regions are the most intensively studied and best known chromosome markers in plants. In Vigna species, blocks of constitutive heterochromatin were found either in the terminal or interstitial region of the chromosomes. The number and distribution of CMA(+) and DAPI(+) binding sites exhibit high chromosomal variability with characteristic unique banding patterns in all the eight taxa. A predominant feature was observed, i.e., most of the CMA(+) binding sites were in the terminal region of the short arm of some chromosomes while DAPI(+) binding sites were found mostly in the intercalary region of the chromosomes. The higher divergence in the heterochromatin blocks, as revealed by chromomycin A3 (CMA) binding pattern, in a few taxa, viz. Vigna glabrescens, Vigna khandalensis, and Vigna mungo, suggests that the processes of divergent evolution of repetitive sequences in genomic DNA involve a guanine-cytosine (GC)-rich region. On the contrary, Vigna dalzelliana had shown a prominent adenine-thymine (AT)-rich repetitive DNA sequence in terminal regions in the short arm of chromosomes while Vigna umbellata had shown in interstitial regions. The presence of prominent heterochromatic-rich regions, either GC- or AT-rich regions, does facilitate the rate of chromosomal rearrangements leading to restructuring of the karyotypes and thereby helping the species to attempt structural alterations as means of speciation.
机译：异染色质区域是植物中研究最深入，最广为人知的染色体标记。在Vigna物种中，组成性异染色质块位于染色体的末端或间质区域。 CMA（+）和DAPI（+）结合位点的数量和分布在所有八个类群中均表现出高的染色体变异性和特征性的独特条带模式。观察到一个主要特征，即大多数CMA（+）结合位点位于某些染色体短臂的末端区域，而DAPI（+）结合位点主要位于染色体的插入区域。染色菌素A3（CMA）的结合模式表明，在几个分类单元中，异染色质嵌段的散度较高。 Vigna glabrescens，Vigna khandalensis和Vigna mungo表明，基因组DNA中重复序列的发散进化过程涉及富含鸟嘌呤-胞嘧啶（GC）的区域。相反，Vigna dalzelliana在染色体短臂的末端区域显示了一个突出的富含腺嘌呤（AT）的重复DNA序列，而Vigna umbellata在间隙区域显示了。显着的富含异色的区域（GC或AT丰富的区域）的存在确实促进了染色体重排的速度，从而导致核型的重组，从而帮助物种尝试将结构改变作为物种形成的手段。

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