“…In addition to genetic and environmental variability, reciprocal crosses, and independence of pre-and postmating barriers, a detail of other barriers to wide crosses, and various approaches to overcome these, including chromosomal manipulations of the parental species and hybrids, bridge crosses, hormonal application of the florets after pollination, and intra-ovarian fertilization can be found in Hadley & Openshaw (1980), Shivanna (1982), Sharma & Gill (1983a), Sastri & Mallikarjuna (1984), Collins et al . (1984), andPickersgill (1993) .…”