CYTOLOGICAL STUDIES OF TWO SPECIES OF GENUS DELONIXAbstract
Many cytological characteristics were studied in two species of Genus Delonix i.e., D. regia and D. elata . Delonix regia possessed 2n = 28 chromosome number. Both univalent as well as bivalents occurred invariably in this plant species, the former type being predominant over latter type. The chiasma frequency per PMc varied from 8-12 with average being 15.82. The chiasma frequency per chromosome averaged 0.56. The meiosis as well as meiotic indices was quite normal. Whereas Delonix elata is concerned for the above said chromosomal characteristics, it differed minutely in the frequency of chromosomal associations and chiasma frequency (per PMc and per chromosome). It does not show any change in comparison to D. regia in chromosome number, chromosomal distribution at AI and meiotic index. However rod bivalent occurred more frequently than ring type unlike D. regia.
Payal Chandrawat*, Daulat Singh, Santosh K. Sharma and Ramavtar Sharma
Department of Botany, University of Rajasthan, Jaipur, Rajasthan, India
18 October, 2011
14 December, 2011
22 January, 2012