Hybridity and relationship between Chrysanthemum shiwogiku Kitam. and C. vestitum (Hemsl.) Stapf.

Abstract

ABSTRACT. Artificial crosses between the Japanese, octoploid Chrysanthemum shiwogiku Kitamura and Chinese, hexaploid C. vestitum (both Asteraceae-Anthemideae) produced 48 hybrids out of 181 germinated plants grown up to the mature stage. The hybrids showed more or less intermediate in morphological character between the two parents and somewhat more close to C. vestitum in white-color ligule flowers inherited. The chromosome numbers in 19 out of 48 hybrids studied varied from 2n=63 to 81 with various aneuploids and some individuals showed very small-sized chromosomes perhaps due to B-chromosomes of which undetected parentage had produced. The hybrid plants might be able to produce back-cross progenies after hybridization with C. vestitum as a paternal parents, as well as could hybridize with sister plants of the F 1 hybrids as ovule and pollen donors.

Ajania semnanensis sp. nov. (Asteraceae–Anthemideae), from northeast Iran: insights from karyological and micromorphological data

“…A. fruticulosa. As far as our literature review could ascertain, all karyological investigations of the genus Ajania reported solely chromosome number of taxa and the common base chromosome number was found to be x = 9 with ploidy level ranging from diploid to decaploid (Kondo et al 1998, Garcia et al 2006, Zhao et al 2007, 2009, Abd El‐Twab and Kondo 2009). Recently, molecular phylo genetic analysis of Ajania and allied genera based on ITS and ETS sequence data has been performed and a close relationship of Ajania to Chrysanthemum L. was inferred (Zhao et al 2010).…”

“…Tzvel. (Abd El‐Twab and Kondo 2009). Garcia et al (2006) reported the presence of B chromosomes in A. fruticulosa (2n = 36 + 4B), which was not found in A. semnanensis .…”