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GrainGenes Reference Report: GNM-42-662

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Reference	GNM-42-662
Title	Differences in the synaptic pattern in two autotetraploid cultivars of rye with different quadrivalent frequencies at metaphase I
Journal	Genome
Year	2000
Volume	42
Pages	662-667
Author	Martinez M Cuadrado C Sybenga J Romero C
Abstract	Summary: Synaptic behaviour of the two tetraploids rye cultivars Giganton (G) and Tetrapico (T) displaying significant differences in their quadrivalent frequencies at metaphase I was analyzed by electron microscopy in surface-spread prophase I nuclei. A different behaviour was observed between the two cultivars; the synaptonemal complex (SC) quadrivalents frequency being significantly higher in G than in T at prophase I. Moreover, the G SC quadrivalents had more synaptic partner exchanges (SPEs) and their location was more distal than the T SC quadrivalents. However, inverse findings were found at metaphase I, the quadrivalent frequency was higher in T than in G. The role that different factors, mainly the number and location of the SPEs and the frequency and distribution of chiasmata, could play in the evolution from prophase I to metaphase I in both cultivars is discussed
Keyword	argentina [ Show all 13 ]

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