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首页> 外文期刊>Genetic Resources and Crop Evolution >Chromosome numbers and ploidy levels of Paspalum species from subtropical South America (Poaceae)
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Chromosome numbers and ploidy levels of Paspalum species from subtropical South America (Poaceae)

机译：亚热带南美洲（禾本科）的Paspalum种类的染色体数目和倍性水平

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摘要

Somatic chromosome numbers of 131 accessions belonging to 55 Paspalum species from subtropical South America have been determined. All species had x = 10 as a basic chromosome number, except P. almum which had x = 6. Six ploidy levels were found among species with tetraploidy as the most frequent condition. New diploid and octoploid counts were reported. For Paspalum lilloi and P. glabrinode (both 2n = 2x = 20), and for P. ellipticum, P. erianthoides, P. ovale and P. remotum (all 2n = 8x = 80) sporophytic chromosome numbers are presented for the first time. Records that differ from previously reported counts are given for the following species: P. paucifolium (2n = 2x = 20), P. ceresia (2n = 6x = 60), P. conjugatum (2n = 6x = 60), P. alcalinum (2n = 6x = 60) and P. aff. arundinellum (2n + 1 = 5x + 1 = 51). These chromosome data are discussed in light of ploidy-level variation and implications for breeding systems within and among species.
机译：已经确定了来自亚热带南美洲的55种Pa属植物的131个种质的体细胞染色体数。除x。6的P. almum外，所有物种的基本染色体数均为x =10。在四倍体为最常见条件的物种中，发现六倍体水平。据报道有新的二倍体和八倍体计数。对于Paspalum lilloi和P. glabrinode（均为2n = 2x = 20），对于P. ellipticum，P。erianthoides，P。卵和P. remotum（所有2n = 8x = 80）首次显示孢子体染色体编号。下列物种的记录与以前报告的计数不同：青枯假单胞菌（2n = 2x = 20），蜡状假单胞菌（2n = 6x = 60），共轭假单胞菌（2n = 6x = 60），苜蓿假单胞菌（2n = 6x = 60）和P. aff。 arundinellum（2n +1 = 5x +1 = 51）。这些染色体数据是根据倍性水平的变异及其对物种内和物种间繁殖系统的影响进行讨论的。

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