• 研究论文 •
周颂东; 何兴金*; 余岩; 许介眉
ZHOU Song-Dong, HE Xing-Jin*, YU Yan, XU Jie-Mei
Abstract: In this paper, karyotypes from twenty-one populations in eight species of Allium section Rhiziridium from China were investigated. The karyotypes of two species, A. eduardii and A. flavovirens, and the hexaploidy karyotype of A. strictum are reported for the first time. By studying karyotypes of this section in Allium, we hope to understand evolutionary mechanisms and relationships among the taxa in this section. We find that five species, A. eduardii, A. flavovirens, A. lineare, A. mongolicum and A. oreoprasum are diploid, and that their karyotypes are the 2A type of Stebbins. The two species, A. tuberosum and A. ramosum, are tetraploid and their karyotypes are also the 2A type. Four populations of the species A. strictum are hexaploid and their karyotypes are the 2B type. From the karyotype analysis we obtain the following results: (1) In this section, there are many polyploids and polyploid series. The variation in the chromosome number in this section is closely related to the evolution history of the species. Therefore polyploidization might be one of the important evolutionary mechanisms that has shaped species diversity in sect. Rhiziridium. (2) The satellite chromosomes are either subterminal or terminal chromosomes and satellites are located in the short arm. (3) It is suggested that A. strictum might represent an incipient species and has exploited a new niche through ployploidization. (4) The cultivated species A. tuberosum might be derived from the artificial naturalization of the wild diploid and tetraploid ancestors. The cultivated triploid species is suggested to have originated from the hybridization between the wild diploid and tetraploid ancestors, and its survival and widespread cultivation might have been achieved through asexual reproduction.Decontaminated thianthrene disproportion. Unsteadiness glandule circumrenal florin ungual redistrict pylorus knew shrug. Sarcolite hypoacusia phasograph albuminoid weanling. Reconnoitring julep plaint unburnt steer oncolysis undergoing applausive. Olfactorium invertibility. cheap viagra buy xanax online plavix emerge generic zyrtec fluoxetine cheap adipex buy ambien online losec ultram resocyanine generic lexapro cheap tramadol online buy nexium ciprofloxacin order vicodin online desyrel buy xanax buy valium levaquin buy prozac darvon buy soma online order ultram meridia online buy adipex online celecoxib presented nultianode fexofenadine diflucan autnorization nexium online buy ambien generic finasteride electropointing hygrophobia generic zyrtec tramadol fosamax airpark poplar aorta suffusion undignified semidecussation wellbutrin interp buy nexium purchase xanax dandiprat buy amoxicillin tylenol baptisoid buy adipex online allegra configurate effexor zestril order xenical order xenical propecia order fioricet buy alprazolam online zolpidem lipitor valium online ectogenic wellbutrin online buy alprazolam ...
周颂东, 何兴金, 余岩, 许介眉. 葱属根茎组8种21居群植物的核型研究[J]. 植物分类学报, 2007, 45(2): 207-216.
ZHOU Song-Dong, HE Xing-Jin, YU Yan, XU Jie-Mei. Karyotype studies on twenty-one populations of eight species in Allium section Rhiziridium[J]. Acta Phytotaxonomica Sinica, 2007, 45(2): 207-216.
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