Cytomorphological Studies in some species of Chrysanthemum L. (Asteraceae)

A BSTRACT. Meiotic studies, chromosome pairing and chiasma frequency were performed on 12 species of Chrysanthemum (Asteraceae). All the species studied are based on x=9, the commonest base number of the genus. The present record of 2n=36 for C. maximum is a new tetraploid cytotype for the species. C. koreanum (2n=54) and C. paludosum (2n=18) are the two species studied cytologically for the first time. Chromosomal counts on Indian accessions of species viz. C. coccineum , C. indicum , C. multicaule , C. pyrethrum and C. segetum are made for the first time. Chiasma frequency ranges from 1.80-1.99 per bivalent in diploids, 2.47-3.01 per bivalent in tetraploids and 1.37 in hexaploid. Multivalents are noticed in both diploids and tetraploids.

[1]  A. Honfi,et al.  IAPT/IOPB chromosome data 12 , 2011 .

[2]  Lin Feng-Tong.  Investigation of Standard Chrysanthemum Cultivars in Six Cities of China , 2011 .

[3]  H. Rees.  Genotypic control of chromosome form and behaviour , 1961, The Botanical Review.

[4]  C. R. Burnham.  Chromosomal interchanges in plants , 1956, The Botanical Review.

[5]  A. Latos-Bieleńska,et al.  Frequency and distribution of chiasmata in Syrian hamster spermatocytes studied by the BrdU antibody technique , 1990, Chromosoma.

[6]  C. Tease,et al.  Analysis of exchanges in differentially stained meiotic chromosomes of Locusta migratoria after BrdU-substitution and FPG staining , 2004, Chromosoma.

[7]  C. Tease,et al.  Analysis of exchanges in differentially stained meiotic chromosomes of Locusta migratoria after BrdU-substitution and FPG staining , 2004, Chromosoma.

[8]  M. Kaul,et al.  Checkered Prophase I in Crown Daisy , 1995 .

[9]  R. Verma,et al.  Annual Chrysanthemum: A New and Novel Material for the Study of Radiation Induced Chromosomal Aberrations at Mitosis , 1994 .

[10]  D. Quicke,et al.  Principles and Techniques of Contemporary Taxonomy , 1993, Experimental and Clinical Neuroscience.

[11]  Kuniaki Watanabe.  Successful ovary culture and production of F1 hybrids and androgenic haploids in Japanese Chrysanthemum species , 1977 .

[12]  B. S. Baker,et al.  The genetic control of meiosis. , 1976, Annual review of genetics.

[13]  P. Paria,et al.  Maintenance of Interchange Heterozygotes in Annual Chrysanthemum , 1971 .

[14]  Z. Bolkhovskikh,et al.  Chromosome numbers of flowering plants. , 1969 .

[15]  H. K. Jain,et al.  Adaptive role of interchange heterozygosity in the annual chrysanthemum , 1965, Heredity.

[16]  M. J. Lawrence,et al.  Genotypic Control of Crossing-Over on the First Chromosome of Drosophila melanogaster , 1958, Nature.

[17]  J. Venkateswarlu,et al.  Embryological studies in the compositæ , 1955, Proceedings / Indian Academy of Sciences.

[18]  G. J. Dowrick.  The chromosomes of Chrysanthemum, I: The species , 1952, Heredity.

[19]  G. Harling.  Embryological studies in the Compositae. 1-3 , 1951 .