Abstract
Two different satellite DNAs exist in the genus Cucurbita which are different with respect to repeat length (350 by and 170 bp), array size, and sequence homogenization. Whereas the 350-bp satellite DNA is prominent and very homogeneous in all species investigated except for C. maxima and C. lundelliana, the 170-bp satellite is rather evenly distributed in all species. In C. maxima and C. lundelliana the 350-bp satellite is present only in small amounts, but detectable by the sensitive PCR method. These repeats are also very homogeneous, reflecting a silent stage of satellite DNA. In contrast, the 170-bp satellite DNA is intra- and interspecifically heterogeneous. It is striking that the species with no detectable amount of 350-bp satellite contain 170-bp satellite DNA clusters with the highest degree of homogeneity. The evolution of satellite DNA repeats within cultivated and wild species in the genus Cucurbita is elucidated using the sequence data of both satellite DNAs from all species investigated. The value of satellite DNA for phylogenetic analysis between closely related species is discussed.
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King, K., Jobst, J. & Hemleben, V. Differential homogenization and amplification of two satellite DNAs in the genus Cucurbita (Cucurbitaceae). J Mol Evol 41, 996–1005 (1995). https://doi.org/10.1007/BF00173181
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DOI: https://doi.org/10.1007/BF00173181