Karyological Studies on the Solanaceae

Abstract

Abstract:Comparative karyological studies for 23 taxa of the Solanaceae have been presented and their taxonomic aspects are discussed. It was concluded that the origin of the family is a taxon with basic chronomosome number of x = 7 or 8 which gave rise to other taxa by aneuplodiy and polyploidy. Nictiana elate and Browallia viscose are found to be less evolved than the other species studied. Concerning the total form percentage (TF%) a reverse trend towards increasing the degree of karyotype symmetry with advancing evolution is concluded.

Cu diffusion as an alternative method for nanopatterned CuTCNQ film growth

“…Orientation implies that the TCNQ molecules lay flat to the substrate surface. El-Nahas et al [19] show that the as-deposited film is polycrystalline, but when annealed a preferred (0 2 2) orientation is exhibited. Tseng et al (2015) [16] show that the growth of TCNQ is sensitive to the nature of the substrate, which influences the film morphology, molecular orientation and structure.…”

Karyotypic studies of four Physalis species from Nigeria

“…Out of the four Physalis species studied, only P. angulata is tetraploid. El-Nahas et al (2000) stated that the presence of polyploidy in a certain taxon is an evidence of advancement. It is therefore hypothesised that P. angulata is the most advanced among the four Physalis species studied.…”