柑橘种质库51份材料的染色体数目和次生缩窄变异

M. Guerra, A. Pedrosa, A. E. B. E. Silva, M. T. M. Cornélio, K. G. B. Santos, W. S. Filho
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引用次数: 36

摘要

对来自巴西鲁兹达斯阿尔马斯省国家热带果树种植中心的51份柑橘有丝分裂染色体进行了分析。样本包括柑橘20个品种的代表,柑桔1个品种和7个杂交种。所有材料均显示2n = 18,无数值变化迹象。最明显的变异核型特征是次级缢痕(SECs)的数量和位置。在19份材料中,主要由于染色质凝结的程度,未鉴定出SECs。在其余的核型中,它们的数量从1到3不等。它们被发现在三个最大的染色体对之一的近端区域,在一个较小的染色体的末端/亚末端区域,或更罕见的,在一个较大的染色体的末端。只有在少数情况下,在同一对染色体的两个同源物中同时观察到这种收缩。这种核型特征的高变异性可能是由于该区域在前间期的激活,但也可能表明柑橘种质的高结构变异性和杂合性
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Chromosome number and secondary constriction variation in 51 accessions of a citrus germplasm bank
The mitotic chromosomes of 51 citrus accessions from the Centro Nacional de Pesquisa em Mandioca e Fruticultura Tropical, Cruz das Almas, BA, Brazil, were analyzed. The sample included representatives of 20 Citrus species, one of Poncirus and seven hybrids. All accessions showed 2n = 18 without any evidence of numerical variation. The most clearly variable karyotype feature was the number and position of secondary constrictions (SECs). In 19 accessions the SECs were not identified, mainly due to the degree of chromatin condensation. In the remainder they varied in number from one to three per karyotype. They were found in the proximal region of one of the three largest chromosome pairs, in the terminal/subterminal region of a smaller chromosome or, more seldom, terminally in a larger chromosome. Only in a few cases were such constrictions observed simultaneously in both homologues of the same chromosome pair. The high variability of this karyotype feature may be due to the activation of this region in the previous interphase but may also indicate a high structural variability and heterozygosity of citrus germplasms
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