Cytological studies in the genus Alysicarpus Neck.

John, C. K.; Tulpule, Shrikrishna Hari; Thengane, Ratnakar J.

doi:10.1508/cytologia.51.893

Cited by 1 publication

(3 citation statements)

References 9 publications

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“…nummularifolius has higher total chromosome length than other members of Microcalycinae and A. bupleurifolius DC. has a lower total chromosome length than the rest of the species and varieties under Macrocalycinae (JoHN 1989).…”

Section: Discussionmentioning

confidence: 94%

“…Since the length of the chromosomes is liable to be affected, at least in part by the degree of condensation as well as the pressure exerted on the glass slide used in microscopy, while making the squash preparations, it was not apparent as to whether these differences in the total length of the chromosome complements truely reflect the differences in the amount of chromatin material. Moreover, the karyotypic details further indicated the subgenera as natural groups, since most of the species and varieties under any subgenus showed a clustering of the karyological parameters (JOHN 1989).…”

Section: Introductionmentioning

confidence: 93%

“…If the lowest degree of asymmetry of the karyotype is assumed as a primitive character (STEBBINS 1971), A. hamosus Edgew. appears to be the most primitive species among the species and varieties of Alysicarpus studied, since it shows the maximum total form percentage, has two metacentric chromosomes in its complement and belongs to class 1 a when classified according to STEBBINS 2-way system of classification of karyotype asymmetry (JoHN et al 1986). If one is to consider A. hamosus Edgew.…”

mentioning

confidence: 99%

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Relationship between nuclear DNA content and speciation inAlysicarpus

John

Thengane

1994

Caryologia

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-4C nuclear DNA contents were determined in 11 collections of Alysicarpus Neck. representing 9 species and 3 varieties. The 4C nuclear DNA contents varied from 9.225 to 13.194 picograms. A clustering of DNA values were observed in the species and varieties belonging to different sub-genera. A. belgaumensis which has a higher chromosome number of 2n = 22 showed the maximum DNA content as compared to the rest of the species and varieties which have chromosome number 2n = 16. Per-chromosome DNA amounts showed that A. belgaumensis has more affinity to members of Microcalycinae. Observations on the DNA contents indicated that the sub-genus Desmodiastrum may have originated from a common ancestor as Microcalycinae and Macrocalycinae or from some species of Microcalycinae by aneuploidy without increase in per-chromosome DNA content. The development of Macrocalycinae seems to be associated with increase in perchromosome DNA content. This is in agreement with PRAIN's classification of the genus as consisting of 3 sub-genera and members of Desmodiastrum as belonging to the genus Alysicarpus rather than Desmodium.