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Cytomorphological diversity of Ageratum Species from North-West India.

Arneet Gill, Puja Garg*


Ageratum belongs to tribe Eupatoriae of family Asteraceae. In the present study floristic forays revealed the prevalence of two species of the genus in North India namely, A. conyzoides and A. houstonianum. Two morphovariants were observed in both the species. The plants were found to differ on the basis of leaf shape and flower colour. Further, analysis of male meiosis revealed the presence of three cytotypes of A. conyzoides and two cytotypes of A. houstonianum. The specimens of A. conyzoides with purple flowers were found to have chromosome count of n=10 (diploid cytotype, 2x) and rarely plants with chromosome count of 2n=30 (triploid cytotype, 3x) were also observed. This is the first report of 3x plants of A. conyzoides from wild. The white flowered plants were found to be tetraploid with n=20. In the specimens of A. houstonianum, the diploid number n=10 was found in white flowered plants while tetraploid number n=20 was found in purple flowered plants. The meiotic course varies from normal to abnormal in some populations of both the species.


A. conyzoides; A. houstonianum; Cytotype (2x; 3x and 4x); Morphotype.

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Adebayo AH, CJ Ji, YM Zhang, WJ He, GZ Zeng, HJ Han, JJ Xu, AA Akindahunsi, NH Tan. “A new chromene isolated from Ageratum conyzoides” Natural Product Communications 6.9 (2011): 1263-1265.

Bir SS, M Sidhu. “Cytological observations in weed flora of orchards of Patiala district, Punjab”. Recent Research in Plant Sciences 7 (1979): 261-271.

Burkill HM. “The useful plants of West Tropical Africa, Kew: Royal Botanic Garden:”. 1 (1985).

Chen RY, WQ Song, XL Li, MX Li, GL Liang, CB Chen. “Chromosome atlas of major economic plants genome in China”. Chromosome Atlas of Garden Flowering Plants in China Science Press, Beijing 3 (2003).

Chopra RN, SL Nayar, IC Chopra. “Glossary of Indian Medicinal Plants”. New Delhi NISCIR (2002): 9.

Cooper DC, KL Mahony. “Cytological observations on certain compositae”. American Journal of Botany 22 (1935): 843-849.

Dey D. “Diploidy and tetraploidy in Ageratum conyzoides L”. Cell and chromosome Newsletter 2 (1979): 7-9.

Gaonkar RV, SG Torne. “Induced autotetraploidy in Ageratum conyzoides L”. Cytologia 56 (1991): 327-331.

George S, V Mathew, PM Mathew. “Cytology of a few south Indian Eupatorieae (Compositae)”. Glimpses Cytogenetics 2 (1989): 293–298.

Gill BS, T Gupta. “B- chromosomes in Ageratum conyzoides”. Proceedings of 58th Indian Science Congress 3 (1971): 477-478.

Girthens TS. “Drug plants of Africa”. African Handbooks 8 (1948): 59.

Gupta RC, BS Gill. “Cytopalynology of North and Central Indian Compositae”. Journal of Cytology and Genetics 24 (1989): 96-105.

Hsu CC. “Preliminary chromosome studies on the vascular plants of Taiwan (I)”. Taiwania 13 (1967): 117-130.

Hsu CC. “Preliminary chromosome studies on the vascular plants of Taiwan (III) The aster family, Compositae”. Taiwania 15 (1970): 17-29.

Husaini SWH, GA Iwo. “Cytology of some weedy species of the family Compositae (Asteraceae) from Jos Plateau Nigeria”. Feddes Repertorium 101 (1990): 49-62.

Ishikawa M. “The chromosome numbers of some Compositae”. Botanical Magazine 25 (1916): 399.

Johnson MF. “A monograph of the genus Ageratum L. (Compositae, Eupatorieae)”. Annals of the Missouri Botanical Garden 58 (1971): 6-88.

Kamboj A, AK Saluja. “Ageratum conyzoides L.: A review on its phytochemical and pharmacological profile”. International Journal of Green Pharmacy 2 (2008): 59-68.

Kapur SK. “Ethnomedico plants of Kangra Valley (Himachal Pradesh)”. Journal of Economic and Taxonomic Botany 17 (1993): 395-408.

Kaul MLH. “Cytogenetics of polyploids. III. Dauermodifications in Ageratum conyzoides L”. Cytologia 32 (1967): 147-156.

Kaur R, NK Dogra. “A review on traditional uses, chemical constituents and pharmacology of Ageratum conyzoides L. (Asteraceae)”. International Journal of Pharmaceutical and Biological Archives 5.5 (2014): 33-45.

Keil DJ, MA Luckow, DJ Pinkava. “Chromosome studies in Asteraceae from the United States, Mexico, the West Indies, and South America”. American Journal of Botany 75 (1988): 652–668.

Kumar N. “Biological potential of a weed Ageratum houstonianum Mill: A Review”. Indo American Journal of Pharmaceutical Research 4.6 (2014): 2683-2689.

Love A, D Love. “Chromosome numbers of central and north west European plant species”. Opera Botanica 5 (1961): 1-581.

Marks GE. “An acetocarmine glycerol jelly for use in pollen fertility counts”. Stain Techniques 29 (1954): 277.

Mathew A, PM Mathew. “Cytological studies on the south Indian Compositae”. Glimpses of Plant Research 8 (1988): 1–177.

Mathew PM, A Mathew. “Studies on the south Indian Compositae V. Cytotaxonomic consideration of the tribes Vernonieae and Eupatorieae”. Cytologia 48 (1983): 679–690.

Mehra PN, P Remanandan. “Cytological investigations on Indian Compositae IV. Tribes Senecioneae, Eupatorieae, Vernonieae and Inuleae”. Nucleus 18 (1975): 6-19.

Mehra PN, SS Sidhu. “Cytology of the North-West Indian Compositae”. Proceedings of 47th Indian Science Congress 3 (1960): 376-377.

Mehra PN, BS Gill, JK Mehta, SS Sidhu. “Cytological investigations on the Indian compositae I North Indian taxa”. Caryologia 18 (1965): 35-68.

Miyagi C. “Chromosome numbers in spermatophytes from Okinawa Islands (1)”. Biological Magazine Okinawa 8 (1971): 14-23.

Morton JK. “Chromosome numbers and polyploidy in the flora of Cameroon Mountain”. Opera Botanica 121 (1993): 159-172.

Nazeer MA, GV Subramanyam, KJ Madusoodanan, D Ohri. “Cytology of triploid hybrid of Ageratum Linn”. Current Science 50 (1981): 97-98.

Nirmala A, PN Rao. “Karyotype studies in some Asteraceae”. Cell Chromosome Research 12 (1989): 17-18.

Okunade AL. “Ageratum conyzoides L. (Asteraceae)”. Fitoterapia 73 (2002): 1-16.

Ramanpreet, RC Gupta. “Meiotic abnormalities in Ageratum conyzoides from hot desert of India (Rajasthan)”. Chromosome Botany 10 (2015): 67-74.

Razaq ZA, AA Vahidy, SI Ali. “Chromosome number in Compositae from Pakistan”. Annals of Missouri Botanical Garden 81 (1994): 800-808.

Sahu TR. “Taxonomic studies of the genus Ageratum L. in India”. Feddes Repertorium 93 (1982): 61-65.

Sharma AK, JS Dhakre. “In chromosome number reports LXXIII”. Taxon 30 (1981): 854.

Sharma AK, B Verma. “Cytology of several members of Compositae I”. Proceedings of 47th Indian Science Congress 3 (1960): 367.

Sharma PD, OP Sharma. “Natural products chemistry and biological properties of the Ageratum plant”. Toxicology Environmental Chemistry 50 (1995): 213.

Shukur A, KN Narayan, C Shantamma. “In IOPB Chromosome number reports LV”. Taxon 26 (1977): 107-109.

Sidhu M, SS Pelia. “Karyomorphology of some species of weeds – Compositae”. Journal of Cytology and Genetics 22 (1987): 143–150.

Singh SB, WR Devi, A Marina, WI Devi, N Swapana, CB Singh. “Ethnobotany, phytochemistry and pharmacology of Ageratum conyzoides Linn (Asteraceae)”. Journal of Medicinal Plants Research 7.8 (2013): 371-385.

Singh V, H Singh, GP Sharma, AS Raghubanshi. “Eco-physiological performance of two invasive weed congeners (Ageratum conyzoides L. and Ageratum houstonianum Mill.) in the Indo-Gangetic plains of India”. Environmental Monitoring and Assessment 178 (2011): 415-422.

Singhal VK, P Garg, P Kumar. “Cytological studies of some Dicots from the Hills of Mandi district (Himachal Pradesh) in Northwest Indian Himalayas”. Cytologia 78.1 (2013): 55-68.

Subramanyam K, NP Kamble. “In: IOPB Chromosome number reports XII”. Taxon 16 (1967): 341-350.

Turner BL, RM King. “Chromosome numbers in the Compositae VIII. Mexican and Central American species”. South Western Naturalist 9 (1964): 27-39.

Xie ZY, CM Zheng. “Cytological studies on 13 species of Compositae from Hainan, China”. Acta Phytotaxonomica Sinica 41.6 (2003): 545-552.


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