) have demonstrated the occurrence of spontaneous chromosome doubling in apomictic mango cultivars, which results in tetraploid progeny morphologically distinct from their diploid progenitors. An identical phenomenon occurs within the Citrus genus and has
. Induction of polyploids in plants through chromosome doubling have had major effects on plant phenotypes in ornamentals and food crops. Traits such as thicker leaves ( Yenchon and Techato, 2014 ), improved abiotic stress tolerance ( Liu et al., 2011 ), and
, a phenomenon often observed after chromosome doubling ( Buggs et al., 2009 ; Leitch et al., 2008 ; Soltis et al., 2003 ). Male fertility. Pollen stainability in triploid plants ranged from 50% to 72% (60% average) compared with 73% to 77% (74
3888 Liu, G.F. Li, Z.N. Bao, M.H. 2007 Colchicine-induced chromosome doubling in Platanus acerifolia and its effect on plant morphology Euphytica 157 145 154 Mack, R.N. Simberloff
). A sterile F 1 from two distant species can be retrieved by embryo and ovule culture and directly used as a bridge line for gene transfer ( Pico et al., 2000 ; Poysa, 1990 ; Wang et al., 2002 ) or subsequently chromosome doubled to produce a
combination of restitution gametes or spontaneous chromosome doubling of the zygote. Table 4. Fertility of interspecific Salvia hybrids after self-pollination or back-crossing to parental species. z Table 5. Chromosome numbers of Salvia species and
breeding to develop a temperate zone passion fruit ( Knight, 1991 ), but using diverse germplasm may uncover improved fertility that could circumvent the need for chromosome doubling. The objective of this research was to use P. incarnata genotypes from
to breed for increasing specific pectin contents in A. fistulosum via the use of the MAL chromosome doubling program ( Yaguchi et al., 2008a ). The clarification of the pectin phenotypes in MALs and the chromosomal locations of shallot genes related
thought to be the primary means of chromosome doubling and thereby achieving higher levels of ploidy ( Parisod et al., 2010 ). However, Les and Philbrick (1993) have suggested that with many aquatic angiosperms (characterized by clonal growth, high
hybridization in Vaccinium HortScience 21 52 57 Manzoor, A. Ahmad, T. Bashir, M.A. Hafiz, I.A. Silvestri, C. 2019 Studies on colchicine induced chromosome doubling for enhancement of quality traits in ornamental plants Plants 8 194 https