Cytological Distinctions Between Timun Suri and Cucumber Discovered by Fluorescence In Situ Hybridization (FISH) Using 45S Ribosomal DNA Gene

A. Setiawan, A. Purwantoro, A. Wibowo
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引用次数: 2

Abstract

The genus  Cucumis including timun suri, melon and cucumber, is important horticultural crop of flowering plants. The dispute of timun suri terminology is leading to false positive result in nomenclature of timun suri in Indonesia. Although the molecular research on these species has been widely conducted, detailed information and precise evidences based on molecular cytogenetic approach are poorly investigated. Fluorescence in situ hybridization (FISH) technique was used to reveal the cytological distinctions among these species. Here, we conducted physical mapping of 45S ribosomal DNA (rDNA) on six accessions of  Cucumis . We confirmed that timun suri cannot be classified as cucumber. The chromosome number of cucumber is 14 chromosomes, while timun suri and melon are 24 chromosomes. The number of 45S rDNA loci in cucumber, melon and timun suri was highly conserved. All cucumber accessions in this study had nine to ten 45S rDNA loci with strong and weak signal intensities located at proximal regions of the short arms. Whereas in melon and timun suri, the signals of two pairs of 45S rDNA were located at terminal and interstitial regions of the short arms. These were clear evidences to confirm that timun suri was cytogenetically closed to melon instead of cucumber.
利用45S核糖体DNA基因荧光原位杂交技术(FISH)发现苏瑞和黄瓜的细胞学差异
黄瓜属植物包括西瓜、甜瓜和黄瓜,是重要的开花植物园艺作物。印尼的水豚命名争议导致水豚命名出现假阳性结果。虽然对这些物种的分子研究已经广泛开展,但基于分子细胞遗传学方法的详细信息和精确证据却很少。荧光原位杂交(FISH)技术揭示了这些物种之间的细胞学差异。在此基础上,我们对6份黄瓜材料进行了45S核糖体DNA (rDNA)的物理定位。我们确认timun suri不能归类为黄瓜。黄瓜的染色体数为14条,甜瓜和西瓜的染色体数为24条。黄瓜、甜瓜和猕猴桃中45S rDNA位点数量高度保守。本研究所有黄瓜材料均有9 ~ 10个45S rDNA位点,信号强弱分布在短臂近端。而在甜瓜和猕猴桃中,两对45S rDNA的信号位于短臂的末端和间隙区。这些都是明确的证据,证实了苏瑞在细胞遗传学上与甜瓜而不是黄瓜接近。
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